[PATCH] makedumpfile: request the kernel do page scans

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From: Cliff Wickman <cpw@xxxxxxx>
Subject: Re: [PATCH] makedumpfile: request the kernel do page scans
Date: Mon, 19 Nov 2012 12:07:10 -0600

> On Fri, Nov 16, 2012 at 03:39:44PM -0500, Vivek Goyal wrote:
>> On Thu, Nov 15, 2012 at 04:52:40PM -0600, Cliff Wickman wrote:
>> > 
>> > Gentlemen,
>> > 
>> > I know this is rather late to the game, given all the recent work to speed
>> > up makedumpfile and reduce the memory that it consumes.
>> > But I've been experimenting with asking the kernel to scan the page tables
>> > instead of reading all those page structures through /proc/vmcore.
>> > 
>> > The results are rather dramatic -- if they weren't I would not presume to
>> > suggest such a radical path.
>> > On a small, idle UV system: about 4 sec. versus about 40 sec.
>> > On a 8TB UV the unnecessary page scan alone takes 4 minutes, vs. about 200 min
>> > through /proc/vmcore.
>> > 
>> > I have not compared it to your version 1.5.1, so I don't know if your recent
>> > work provides similar speedups.
>> 
>> I guess try 1.5.1-rc. IIUC, we had the logic of going through page tables
>> but that required one single bitmap to be present and in constrained
>> memory environment we will not have that.
>> 
>> That's when this idea came up that scan portion of struct page range,
>> filter it, dump it and then move on to next range.
>> 
>> Even after 1.5.1-rc if difference is this dramatic, that means we are
>> not doing something right in makedumpfile and it needs to be
>> fixed/optimized.
>> 
>> But moving the logic to kernel does not make much sense to me at this
>> point of time untile and unless there is a good explanation that why
>> user space can't do a good job of what kernel is doing.
> 
> I tested a patch in which makedumpfile does nothing but scan all the
> page structures using /proc/vmcore.  It is simply reading each consecutive
> range of page structures in readmem() chunks of 512 structures. And doing
> nothing more than accumulating a hash total of the 'flags' field in each
> page (for a sanity check). On my test machine there are 6 blocks of page
> structures, totaling 12 million structures. This takes 31.1 'units of time'
> (I won't say seconds, as the speed of the clock seems to be way too fast in
> the crash kernel). If I increase the buffer size to 5120 structures: 31.0 units.
> At 51200 structures: 30.9.  So buffer size has virtually no effect.
> 
> I also request the kernel to do the same thing.  Each of the 6 requests
> asks the kernel to scan a range of page structures and accumulate a hash
> total of the 'flags' field.  (And also copy a 10000-element pfn list back
> to user space, to test that such copies don't add significant overhead.)
> And the 12 million pages are scanned in 1.6 'units of time'.
> 
> If I compare the time for actual page scanning (unnecessary pages and
> free pages) through /proc/vmcore vs.  requesting the kernel to do the
> scanning:  40 units vs. 3.8 units.
> 
> My conclusion is that makedumpfile's page scanning procedure is extremely
> dominated by the overhead of copying page structures through /proc/vmcore.
> And that is about 20x slower than using the kernel to access pages.

I have not tested your patch set on the machine with 2TB due to
reservation problem, but I already tested it on my local machine with
32GB and saw big performance improvement.

I applied your patch set on makedumpfile v1.5.1-rc and added an option
-N not to dump pages to focus on scanning pages part only.

By this, while scanning pages in user-space took about 25 seconds,
scanning pages in kernel-space took about 1 second.

During the execution I profiled it using perf record/report and its
results are attached files.

>From this we can notice that current makedumpfile consumes large part
of execution time for ioremap and its related processing. copy_to_user
was less than 2% only relative to a whole processing.

Looking into the codes around read method of /proc/vmcore, its call
stack can be broken into as follows:

  read_vmcore
    read_from_oldmem
      copy_oldmem_page

copy_oldmem_page reads the 1st kernel's memory *per page* using
ioremap_cache and after completing it, immediately unmaps the remapped
address using iounmap.

Because ioremap/iounmap is called *per page*, this number of calling
ioremap throught scanning a whole pages is unchanged even if
makedumpfile's cache size is changed. This seems consistent with
Cliff's explanation that increasing 512 entries of makedumpfile's
cache was meaningless.

I think the first step to address this issue is to introduce a kind of
cache in read_vmcore path to reduce the number of calling
ioremap/iounmap. Porting scanning logic into kernel-space should be
considered if it turns out not to work enough.

Thanks.
HATAYAMA, Daisuke
-------------- next part --------------
sadump: does not have partition header
sadump: read dump device as unknown format
sadump: unknown format
LOAD (0)
  phys_start : 1000000
  phys_end   : 22f1000
  virt_start : ffffffff81000000
  virt_end   : ffffffff822f1000
LOAD (1)
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  virt_start : ffff880000010000
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LOAD (2)
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  virt_start : ffff880000100000
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LOAD (3)
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LOAD (4)
  phys_start : 100000000
  phys_end   : 880000000
  virt_start : ffff880100000000
  virt_end   : ffff880880000000
Linux kdump
page_size    : 4096
page_size    : 4096

max_mapnr    : 880000

Buffer size for the cyclic mode: 2228224

num of NODEs : 4


Memory type  : SPARSEMEM_EX

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  pfn_end    : 470000
mem_map (142)
  mem_map    : ffffea000f880000
  pfn_start  : 470000
  pfn_end    : 478000
mem_map (143)
  mem_map    : ffffea000fa40000
  pfn_start  : 478000
  pfn_end    : 480000
mem_map (144)
  mem_map    : ffffea000fc00000
  pfn_start  : 480000
  pfn_end    : 488000
mem_map (145)
  mem_map    : ffffea000fdc0000
  pfn_start  : 488000
  pfn_end    : 490000
mem_map (146)
  mem_map    : ffffea000ff80000
  pfn_start  : 490000
  pfn_end    : 498000
mem_map (147)
  mem_map    : ffffea0010140000
  pfn_start  : 498000
  pfn_end    : 4a0000
mem_map (148)
  mem_map    : ffffea0010300000
  pfn_start  : 4a0000
  pfn_end    : 4a8000
mem_map (149)
  mem_map    : ffffea00104c0000
  pfn_start  : 4a8000
  pfn_end    : 4b0000
mem_map (150)
  mem_map    : ffffea0010680000
  pfn_start  : 4b0000
  pfn_end    : 4b8000
mem_map (151)
  mem_map    : ffffea0010840000
  pfn_start  : 4b8000
  pfn_end    : 4c0000
mem_map (152)
  mem_map    : ffffea0010a00000
  pfn_start  : 4c0000
  pfn_end    : 4c8000
mem_map (153)
  mem_map    : ffffea0010bc0000
  pfn_start  : 4c8000
  pfn_end    : 4d0000
mem_map (154)
  mem_map    : ffffea0010d80000
  pfn_start  : 4d0000
  pfn_end    : 4d8000
mem_map (155)
  mem_map    : ffffea0010f40000
  pfn_start  : 4d8000
  pfn_end    : 4e0000
mem_map (156)
  mem_map    : ffffea0011100000
  pfn_start  : 4e0000
  pfn_end    : 4e8000
mem_map (157)
  mem_map    : ffffea00112c0000
  pfn_start  : 4e8000
  pfn_end    : 4f0000
mem_map (158)
  mem_map    : ffffea0011480000
  pfn_start  : 4f0000
  pfn_end    : 4f8000
mem_map (159)
  mem_map    : ffffea0011640000
  pfn_start  : 4f8000
  pfn_end    : 500000
mem_map (160)
  mem_map    : ffffea0011800000
  pfn_start  : 500000
  pfn_end    : 508000
mem_map (161)
  mem_map    : ffffea00119c0000
  pfn_start  : 508000
  pfn_end    : 510000
mem_map (162)
  mem_map    : ffffea0011b80000
  pfn_start  : 510000
  pfn_end    : 518000
mem_map (163)
  mem_map    : ffffea0011d40000
  pfn_start  : 518000
  pfn_end    : 520000
mem_map (164)
  mem_map    : ffffea0011f00000
  pfn_start  : 520000
  pfn_end    : 528000
mem_map (165)
  mem_map    : ffffea00120c0000
  pfn_start  : 528000
  pfn_end    : 530000
mem_map (166)
  mem_map    : ffffea0012280000
  pfn_start  : 530000
  pfn_end    : 538000
mem_map (167)
  mem_map    : ffffea0012440000
  pfn_start  : 538000
  pfn_end    : 540000
mem_map (168)
  mem_map    : ffffea0012600000
  pfn_start  : 540000
  pfn_end    : 548000
mem_map (169)
  mem_map    : ffffea00127c0000
  pfn_start  : 548000
  pfn_end    : 550000
mem_map (170)
  mem_map    : ffffea0012980000
  pfn_start  : 550000
  pfn_end    : 558000
mem_map (171)
  mem_map    : ffffea0012b40000
  pfn_start  : 558000
  pfn_end    : 560000
mem_map (172)
  mem_map    : ffffea0012d00000
  pfn_start  : 560000
  pfn_end    : 568000
mem_map (173)
  mem_map    : ffffea0012ec0000
  pfn_start  : 568000
  pfn_end    : 570000
mem_map (174)
  mem_map    : ffffea0013080000
  pfn_start  : 570000
  pfn_end    : 578000
mem_map (175)
  mem_map    : ffffea0013240000
  pfn_start  : 578000
  pfn_end    : 580000
mem_map (176)
  mem_map    : ffffea0013400000
  pfn_start  : 580000
  pfn_end    : 588000
mem_map (177)
  mem_map    : ffffea00135c0000
  pfn_start  : 588000
  pfn_end    : 590000
mem_map (178)
  mem_map    : ffffea0013780000
  pfn_start  : 590000
  pfn_end    : 598000
mem_map (179)
  mem_map    : ffffea0013940000
  pfn_start  : 598000
  pfn_end    : 5a0000
mem_map (180)
  mem_map    : ffffea0013b00000
  pfn_start  : 5a0000
  pfn_end    : 5a8000
mem_map (181)
  mem_map    : ffffea0013cc0000
  pfn_start  : 5a8000
  pfn_end    : 5b0000
mem_map (182)
  mem_map    : ffffea0013e80000
  pfn_start  : 5b0000
  pfn_end    : 5b8000
mem_map (183)
  mem_map    : ffffea0014040000
  pfn_start  : 5b8000
  pfn_end    : 5c0000
mem_map (184)
  mem_map    : ffffea0014200000
  pfn_start  : 5c0000
  pfn_end    : 5c8000
mem_map (185)
  mem_map    : ffffea00143c0000
  pfn_start  : 5c8000
  pfn_end    : 5d0000
mem_map (186)
  mem_map    : ffffea0014580000
  pfn_start  : 5d0000
  pfn_end    : 5d8000
mem_map (187)
  mem_map    : ffffea0014740000
  pfn_start  : 5d8000
  pfn_end    : 5e0000
mem_map (188)
  mem_map    : ffffea0014900000
  pfn_start  : 5e0000
  pfn_end    : 5e8000
mem_map (189)
  mem_map    : ffffea0014ac0000
  pfn_start  : 5e8000
  pfn_end    : 5f0000
mem_map (190)
  mem_map    : ffffea0014c80000
  pfn_start  : 5f0000
  pfn_end    : 5f8000
mem_map (191)
  mem_map    : ffffea0014e40000
  pfn_start  : 5f8000
  pfn_end    : 600000
mem_map (192)
  mem_map    : ffffea0015000000
  pfn_start  : 600000
  pfn_end    : 608000
mem_map (193)
  mem_map    : ffffea00151c0000
  pfn_start  : 608000
  pfn_end    : 610000
mem_map (194)
  mem_map    : ffffea0015380000
  pfn_start  : 610000
  pfn_end    : 618000
mem_map (195)
  mem_map    : ffffea0015540000
  pfn_start  : 618000
  pfn_end    : 620000
mem_map (196)
  mem_map    : ffffea0015700000
  pfn_start  : 620000
  pfn_end    : 628000
mem_map (197)
  mem_map    : ffffea00158c0000
  pfn_start  : 628000
  pfn_end    : 630000
mem_map (198)
  mem_map    : ffffea0015a80000
  pfn_start  : 630000
  pfn_end    : 638000
mem_map (199)
  mem_map    : ffffea0015c40000
  pfn_start  : 638000
  pfn_end    : 640000
mem_map (200)
  mem_map    : ffffea0015e00000
  pfn_start  : 640000
  pfn_end    : 648000
mem_map (201)
  mem_map    : ffffea0015fc0000
  pfn_start  : 648000
  pfn_end    : 650000
mem_map (202)
  mem_map    : ffffea0016180000
  pfn_start  : 650000
  pfn_end    : 658000
mem_map (203)
  mem_map    : ffffea0016340000
  pfn_start  : 658000
  pfn_end    : 660000
mem_map (204)
  mem_map    : ffffea0016500000
  pfn_start  : 660000
  pfn_end    : 668000
mem_map (205)
  mem_map    : ffffea00166c0000
  pfn_start  : 668000
  pfn_end    : 670000
mem_map (206)
  mem_map    : ffffea0016880000
  pfn_start  : 670000
  pfn_end    : 678000
mem_map (207)
  mem_map    : ffffea0016a40000
  pfn_start  : 678000
  pfn_end    : 680000
mem_map (208)
  mem_map    : ffffea0016c00000
  pfn_start  : 680000
  pfn_end    : 688000
mem_map (209)
  mem_map    : ffffea0016dc0000
  pfn_start  : 688000
  pfn_end    : 690000
mem_map (210)
  mem_map    : ffffea0016f80000
  pfn_start  : 690000
  pfn_end    : 698000
mem_map (211)
  mem_map    : ffffea0017140000
  pfn_start  : 698000
  pfn_end    : 6a0000
mem_map (212)
  mem_map    : ffffea0017300000
  pfn_start  : 6a0000
  pfn_end    : 6a8000
mem_map (213)
  mem_map    : ffffea00174c0000
  pfn_start  : 6a8000
  pfn_end    : 6b0000
mem_map (214)
  mem_map    : ffffea0017680000
  pfn_start  : 6b0000
  pfn_end    : 6b8000
mem_map (215)
  mem_map    : ffffea0017840000
  pfn_start  : 6b8000
  pfn_end    : 6c0000
mem_map (216)
  mem_map    : ffffea0017a00000
  pfn_start  : 6c0000
  pfn_end    : 6c8000
mem_map (217)
  mem_map    : ffffea0017bc0000
  pfn_start  : 6c8000
  pfn_end    : 6d0000
mem_map (218)
  mem_map    : ffffea0017d80000
  pfn_start  : 6d0000
  pfn_end    : 6d8000
mem_map (219)
  mem_map    : ffffea0017f40000
  pfn_start  : 6d8000
  pfn_end    : 6e0000
mem_map (220)
  mem_map    : ffffea0018100000
  pfn_start  : 6e0000
  pfn_end    : 6e8000
mem_map (221)
  mem_map    : ffffea00182c0000
  pfn_start  : 6e8000
  pfn_end    : 6f0000
mem_map (222)
  mem_map    : ffffea0018480000
  pfn_start  : 6f0000
  pfn_end    : 6f8000
mem_map (223)
  mem_map    : ffffea0018640000
  pfn_start  : 6f8000
  pfn_end    : 700000
mem_map (224)
  mem_map    : ffffea0018800000
  pfn_start  : 700000
  pfn_end    : 708000
mem_map (225)
  mem_map    : ffffea00189c0000
  pfn_start  : 708000
  pfn_end    : 710000
mem_map (226)
  mem_map    : ffffea0018b80000
  pfn_start  : 710000
  pfn_end    : 718000
mem_map (227)
  mem_map    : ffffea0018d40000
  pfn_start  : 718000
  pfn_end    : 720000
mem_map (228)
  mem_map    : ffffea0018f00000
  pfn_start  : 720000
  pfn_end    : 728000
mem_map (229)
  mem_map    : ffffea00190c0000
  pfn_start  : 728000
  pfn_end    : 730000
mem_map (230)
  mem_map    : ffffea0019280000
  pfn_start  : 730000
  pfn_end    : 738000
mem_map (231)
  mem_map    : ffffea0019440000
  pfn_start  : 738000
  pfn_end    : 740000
mem_map (232)
  mem_map    : ffffea0019600000
  pfn_start  : 740000
  pfn_end    : 748000
mem_map (233)
  mem_map    : ffffea00197c0000
  pfn_start  : 748000
  pfn_end    : 750000
mem_map (234)
  mem_map    : ffffea0019980000
  pfn_start  : 750000
  pfn_end    : 758000
mem_map (235)
  mem_map    : ffffea0019b40000
  pfn_start  : 758000
  pfn_end    : 760000
mem_map (236)
  mem_map    : ffffea0019d00000
  pfn_start  : 760000
  pfn_end    : 768000
mem_map (237)
  mem_map    : ffffea0019ec0000
  pfn_start  : 768000
  pfn_end    : 770000
mem_map (238)
  mem_map    : ffffea001a080000
  pfn_start  : 770000
  pfn_end    : 778000
mem_map (239)
  mem_map    : ffffea001a240000
  pfn_start  : 778000
  pfn_end    : 780000
mem_map (240)
  mem_map    : ffffea001a400000
  pfn_start  : 780000
  pfn_end    : 788000
mem_map (241)
  mem_map    : ffffea001a5c0000
  pfn_start  : 788000
  pfn_end    : 790000
mem_map (242)
  mem_map    : ffffea001a780000
  pfn_start  : 790000
  pfn_end    : 798000
mem_map (243)
  mem_map    : ffffea001a940000
  pfn_start  : 798000
  pfn_end    : 7a0000
mem_map (244)
  mem_map    : ffffea001ab00000
  pfn_start  : 7a0000
  pfn_end    : 7a8000
mem_map (245)
  mem_map    : ffffea001acc0000
  pfn_start  : 7a8000
  pfn_end    : 7b0000
mem_map (246)
  mem_map    : ffffea001ae80000
  pfn_start  : 7b0000
  pfn_end    : 7b8000
mem_map (247)
  mem_map    : ffffea001b040000
  pfn_start  : 7b8000
  pfn_end    : 7c0000
mem_map (248)
  mem_map    : ffffea001b200000
  pfn_start  : 7c0000
  pfn_end    : 7c8000
mem_map (249)
  mem_map    : ffffea001b3c0000
  pfn_start  : 7c8000
  pfn_end    : 7d0000
mem_map (250)
  mem_map    : ffffea001b580000
  pfn_start  : 7d0000
  pfn_end    : 7d8000
mem_map (251)
  mem_map    : ffffea001b740000
  pfn_start  : 7d8000
  pfn_end    : 7e0000
mem_map (252)
  mem_map    : ffffea001b900000
  pfn_start  : 7e0000
  pfn_end    : 7e8000
mem_map (253)
  mem_map    : ffffea001bac0000
  pfn_start  : 7e8000
  pfn_end    : 7f0000
mem_map (254)
  mem_map    : ffffea001bc80000
  pfn_start  : 7f0000
  pfn_end    : 7f8000
mem_map (255)
  mem_map    : ffffea001be40000
  pfn_start  : 7f8000
  pfn_end    : 800000
mem_map (256)
  mem_map    : ffffea001c000000
  pfn_start  : 800000
  pfn_end    : 808000
mem_map (257)
  mem_map    : ffffea001c1c0000
  pfn_start  : 808000
  pfn_end    : 810000
mem_map (258)
  mem_map    : ffffea001c380000
  pfn_start  : 810000
  pfn_end    : 818000
mem_map (259)
  mem_map    : ffffea001c540000
  pfn_start  : 818000
  pfn_end    : 820000
mem_map (260)
  mem_map    : ffffea001c700000
  pfn_start  : 820000
  pfn_end    : 828000
mem_map (261)
  mem_map    : ffffea001c8c0000
  pfn_start  : 828000
  pfn_end    : 830000
mem_map (262)
  mem_map    : ffffea001ca80000
  pfn_start  : 830000
  pfn_end    : 838000
mem_map (263)
  mem_map    : ffffea001cc40000
  pfn_start  : 838000
  pfn_end    : 840000
mem_map (264)
  mem_map    : ffffea001ce00000
  pfn_start  : 840000
  pfn_end    : 848000
mem_map (265)
  mem_map    : ffffea001cfc0000
  pfn_start  : 848000
  pfn_end    : 850000
mem_map (266)
  mem_map    : ffffea001d180000
  pfn_start  : 850000
  pfn_end    : 858000
mem_map (267)
  mem_map    : ffffea001d340000
  pfn_start  : 858000
  pfn_end    : 860000
mem_map
Excluding unnecessary pages        : [  0 %] 
Excluding unnecessary pages        : [  3 %] 
Excluding unnecessary pages        : [ 17 %] 
Excluding unnecessary pages        : [ 26 %] 
Excluding unnecessary pages        : [ 34 %] 
Excluding unnecessary pages        : [ 42 %] 
Excluding unnecessary pages        : [ 50 %] 
Excluding unnecessary pages        : [ 59 %] 
Excluding unnecessary pages        : [ 67 %] 
Excluding unnecessary pages        : [ 75 %] 
Excluding unnecessary pages        : [ 84 %] 
Excluding unnecessary pages        : [ 92 %] 
Excluding unnecessary pages        : [100 %] 
Excluding unnecessary pages        : [  0 %] 
Excluding unnecessary pages        : [ 13 %] 
Excluding unnecessary pages        : [ 22 %] 
Excluding unnecessary pages        : [ 30 %] 
Excluding unnecessary pages        : [ 38 %] 
Excluding unnecessary pages        : [ 47 %] 
Excluding unnecessary pages        : [ 55 %] 
Excluding unnecessary pages        : [ 63 %] 
Excluding unnecessary pages        : [ 71 %] 
Excluding unnecessary pages        : [ 80 %] 
Excluding unnecessary pages        : [ 88 %] 
Excluding unnecessary pages        : [ 96 %] 
Excluding unnecessary pages        : [100 %] 
 (268)
  mem_map    : ffffea001d500000
  pfn_start  : 860000
  pfn_end    : 868000
mem_map (269)
  mem_map    : ffffea001d6c0000
  pfn_start  : 868000
  pfn_end    : 870000
mem_map (270)
  mem_map    : ffffea001d880000
  pfn_start  : 870000
  pfn_end    : 878000
mem_map (271)
  mem_map    : ffffea001da40000
  pfn_start  : 878000
  pfn_end    : 880000
STEP [Excluding unnecessary pages] : 11.224292 seconds
STEP [Excluding unnecessary pages] : 11.250834 seconds
STEP [Copying data               ] : 11.407836 seconds
Writing erase info...
offset_eraseinfo: 6c0eb8, size_eraseinfo: 0

Original pages  : 0x00000000007ec289
  Excluded pages   : 0x00000000007b9efb
    Pages filled with zero  : 0x0000000000000000
    Cache pages             : 0x0000000000012cff
    Cache pages + private   : 0x0000000000012015
    User process data pages : 0x0000000000001ece
    Free pages              : 0x0000000000793319
  Remaining pages  : 0x000000000003238e
  (The number of pages is reduced to 2%.)
Memory Hole     : 0x0000000000093d77
--------------------------------------------------
Total pages     : 0x0000000000880000


The dumpfile is saved to /mnt///127.0.0.1-2012-12-07-16:45:20/vmcore-empty-1.

makedumpfile Completed.
[ perf record: Woken up 55 times to write data ]
[ perf record: Captured and wrote 13.735 MB /mnt///127.0.0.1-2012-12-07-16:45:20/perf.data1 (~600084 samples) ]
-------------- next part --------------
sadump: does not have partition header
sadump: read dump device as unknown format
sadump: unknown format
LOAD (0)
  phys_start : 1000000
  phys_end   : 22f1000
  virt_start : ffffffff81000000
  virt_end   : ffffffff822f1000
LOAD (1)
  phys_start : 10000
  phys_end   : 9b000
  virt_start : ffff880000010000
  virt_end   : ffff88000009b000
LOAD (2)
  phys_start : 100000
  phys_end   : 27000000
  virt_start : ffff880000100000
  virt_end   : ffff880027000000
LOAD (3)
  phys_start : 37000000
  phys_end   : 7b00d000
  virt_start : ffff880037000000
  virt_end   : ffff88007b00d000
LOAD (4)
  phys_start : 100000000
  phys_end   : 880000000
  virt_start : ffff880100000000
  virt_end   : ffff880880000000
Linux kdump
page_size    : 4096
page_size    : 4096

max_mapnr    : 880000

Buffer size for the cyclic mode: 2228224

num of NODEs : 4


Memory type  : SPARSEMEM_EX

mem_map (0)
  mem_map    : ffffea0000000000
  pfn_start  : 0
  pfn_end    : 8000
mem_map (1)
  mem_map    : ffffea00001c0000
  pfn_start  : 8000
  pfn_end    : 10000
mem_map (2)
  mem_map    : ffffea0000380000
  pfn_start  : 10000
  pfn_end    : 18000
mem_map (3)
  mem_map    : ffffea0000540000
  pfn_start  : 18000
  pfn_end    : 20000
mem_map (4)
  mem_map    : ffffea0000700000
  pfn_start  : 20000
  pfn_end    : 28000
mem_map (5)
  mem_map    : ffffea00008c0000
  pfn_start  : 28000
  pfn_end    : 30000
mem_map (6)
  mem_map    : ffffea0000a80000
  pfn_start  : 30000
  pfn_end    : 38000
mem_map (7)
  mem_map    : ffffea0000c40000
  pfn_start  : 38000
  pfn_end    : 40000
mem_map (8)
  mem_map    : ffffea0000e00000
  pfn_start  : 40000
  pfn_end    : 48000
mem_map (9)
  mem_map    : ffffea0000fc0000
  pfn_start  : 48000
  pfn_end    : 50000
mem_map (10)
  mem_map    : ffffea0001180000
  pfn_start  : 50000
  pfn_end    : 58000
mem_map (11)
  mem_map    : ffffea0001340000
  pfn_start  : 58000
  pfn_end    : 60000
mem_map (12)
  mem_map    : ffffea0001500000
  pfn_start  : 60000
  pfn_end    : 68000
mem_map (13)
  mem_map    : ffffea00016c0000
  pfn_start  : 68000
  pfn_end    : 70000
mem_map (14)
  mem_map    : ffffea0001880000
  pfn_start  : 70000
  pfn_end    : 78000
mem_map (15)
  mem_map    : ffffea0001a40000
  pfn_start  : 78000
  pfn_end    : 80000
mem_map (16)
  mem_map    : 0
  pfn_start  : 80000
  pfn_end    : 88000
mem_map (17)
  mem_map    : 0
  pfn_start  : 88000
  pfn_end    : 90000
mem_map (18)
  mem_map    : 0
  pfn_start  : 90000
  pfn_end    : 98000
mem_map (19)
  mem_map    : 0
  pfn_start  : 98000
  pfn_end    : a0000
mem_map (20)
  mem_map    : 0
  pfn_start  : a0000
  pfn_end    : a8000
mem_map (21)
  mem_map    : 0
  pfn_start  : a8000
  pfn_end    : b0000
mem_map (22)
  mem_map    : 0
  pfn_start  : b0000
  pfn_end    : b8000
mem_map (23)
  mem_map    : 0
  pfn_start  : b8000
  pfn_end    : c0000
mem_map (24)
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mem_map (202)
  mem_map    : ffffea0016180000
  pfn_start  : 650000
  pfn_end    : 658000
mem_map (203)
  mem_map    : ffffea0016340000
  pfn_start  : 658000
  pfn_end    : 660000
mem_map (204)
  mem_map    : ffffea0016500000
  pfn_start  : 660000
  pfn_end    : 668000
mem_map (205)
  mem_map    : ffffea00166c0000
  pfn_start  : 668000
  pfn_end    : 670000
mem_map (206)
  mem_map    : ffffea0016880000
  pfn_start  : 670000
  pfn_end    : 678000
mem_map (207)
  mem_map    : ffffea0016a40000
  pfn_start  : 678000
  pfn_end    : 680000
mem_map (208)
  mem_map    : ffffea0016c00000
  pfn_start  : 680000
  pfn_end    : 688000
mem_map (209)
  mem_map    : ffffea0016dc0000
  pfn_start  : 688000
  pfn_end    : 690000
mem_map (210)
  mem_map    : ffffea0016f80000
  pfn_start  : 690000
  pfn_end    : 698000
mem_map (211)
  mem_map    : ffffea0017140000
  pfn_start  : 698000
  pfn_end    : 6a0000
mem_map (212)
  mem_map    : ffffea0017300000
  pfn_start  : 6a0000
  pfn_end    : 6a8000
mem_map (213)
  mem_map    : ffffea00174c0000
  pfn_start  : 6a8000
  pfn_end    : 6b0000
mem_map (214)
  mem_map    : ffffea0017680000
  pfn_start  : 6b0000
  pfn_end    : 6b8000
mem_map (215)
  mem_map    : ffffea0017840000
  pfn_start  : 6b8000
  pfn_end    : 6c0000
mem_map (216)
  mem_map    : ffffea0017a00000
  pfn_start  : 6c0000
  pfn_end    : 6c8000
mem_map (217)
  mem_map    : ffffea0017bc0000
  pfn_start  : 6c8000
  pfn_end    : 6d0000
mem_map (218)
  mem_map    : ffffea0017d80000
  pfn_start  : 6d0000
  pfn_end    : 6d8000
mem_map (219)
  mem_map    : ffffea0017f40000
  pfn_start  : 6d8000
  pfn_end    : 6e0000
mem_map (220)
  mem_map    : ffffea0018100000
  pfn_start  : 6e0000
  pfn_end    : 6e8000
mem_map (221)
  mem_map    : ffffea00182c0000
  pfn_start  : 6e8000
  pfn_end    : 6f0000
mem_map (222)
  mem_map    : ffffea0018480000
  pfn_start  : 6f0000
  pfn_end    : 6f8000
mem_map (223)
  mem_map    : ffffea0018640000
  pfn_start  : 6f8000
  pfn_end    : 700000
mem_map (224)
  mem_map    : ffffea0018800000
  pfn_start  : 700000
  pfn_end    : 708000
mem_map (225)
  mem_map    : ffffea00189c0000
  pfn_start  : 708000
  pfn_end    : 710000
mem_map (226)
  mem_map    : ffffea0018b80000
  pfn_start  : 710000
  pfn_end    : 718000
mem_map (227)
  mem_map    : ffffea0018d40000
  pfn_start  : 718000
  pfn_end    : 720000
mem_map (228)
  mem_map    : ffffea0018f00000
  pfn_start  : 720000
  pfn_end    : 728000
mem_map (229)
  mem_map    : ffffea00190c0000
  pfn_start  : 728000
  pfn_end    : 730000
mem_map (230)
  mem_map    : ffffea0019280000
  pfn_start  : 730000
  pfn_end    : 738000
mem_map (231)
  mem_map    : ffffea0019440000
  pfn_start  : 738000
  pfn_end    : 740000
mem_map (232)
  mem_map    : ffffea0019600000
  pfn_start  : 740000
  pfn_end    : 748000
mem_map (233)
  mem_map    : ffffea00197c0000
  pfn_start  : 748000
  pfn_end    : 750000
mem_map (234)
  mem_map    : ffffea0019980000
  pfn_start  : 750000
  pfn_end    : 758000
mem_map (235)
  mem_map    : ffffea0019b40000
  pfn_start  : 758000
  pfn_end    : 760000
mem_map (236)
  mem_map    : ffffea0019d00000
  pfn_start  : 760000
  pfn_end    : 768000
mem_map (237)
  mem_map    : ffffea0019ec0000
  pfn_start  : 768000
  pfn_end    : 770000
mem_map (238)
  mem_map    : ffffea001a080000
  pfn_start  : 770000
  pfn_end    : 778000
mem_map (239)
  mem_map    : ffffea001a240000
  pfn_start  : 778000
  pfn_end    : 780000
mem_map (240)
  mem_map    : ffffea001a400000
  pfn_start  : 780000
  pfn_end    : 788000
mem_map (241)
  mem_map    : ffffea001a5c0000
  pfn_start  : 788000
  pfn_end    : 790000
mem_map (242)
  mem_map    : ffffea001a780000
  pfn_start  : 790000
  pfn_end    : 798000
mem_map (243)
  mem_map    : ffffea001a940000
  pfn_start  : 798000
  pfn_end    : 7a0000
mem_map (244)
  mem_map    : ffffea001ab00000
  pfn_start  : 7a0000
  pfn_end    : 7a8000
mem_map (245)
  mem_map    : ffffea001acc0000
  pfn_start  : 7a8000
  pfn_end    : 7b0000
mem_map (246)
  mem_map    : ffffea001ae80000
  pfn_start  : 7b0000
  pfn_end    : 7b8000
mem_map (247)
  mem_map    : ffffea001b040000
  pfn_start  : 7b8000
  pfn_end    : 7c0000
mem_map (248)
  mem_map    : ffffea001b200000
  pfn_start  : 7c0000
  pfn_end    : 7c8000
mem_map (249)
  mem_map    : ffffea001b3c0000
  pfn_start  : 7c8000
  pfn_end    : 7d0000
mem_map (250)
  mem_map    : ffffea001b580000
  pfn_start  : 7d0000
  pfn_end    : 7d8000
mem_map (251)
  mem_map    : ffffea001b740000
  pfn_start  : 7d8000
  pfn_end    : 7e0000
mem_map (252)
  mem_map    : ffffea001b900000
  pfn_start  : 7e0000
  pfn_end    : 7e8000
mem_map (253)
  mem_map    : ffffea001bac0000
  pfn_start  : 7e8000
  pfn_end    : 7f0000
mem_map (254)
  mem_map    : ffffea001bc80000
  pfn_start  : 7f0000
  pfn_end    : 7f8000
mem_map (255)
  mem_map    : ffffea001be40000
  pfn_start  : 7f8000
  pfn_end    : 800000
mem_map (256)
  mem_map    : ffffea001c000000
  pfn_start  : 800000
  pfn_end    : 808000
mem_map (257)
  mem_map    : ffffea001c1c0000
  pfn_start  : 808000
  pfn_end    : 810000
mem_map (258)
  mem_map    : ffffea001c380000
  pfn_start  : 810000
  pfn_end    : 818000
mem_map (259)
  mem_map    : ffffea001c540000
  pfn_start  : 818000
  pfn_end    : 820000
mem_map (260)
  mem_map    : ffffea001c700000
  pfn_start  : 820000
  pfn_end    : 828000
mem_map (261)
  mem_map    : ffffea001c8c0000
  pfn_start  : 828000
  pfn_end    : 830000
mem_map (262)
  mem_map    : ffffea001ca80000
  pfn_start  : 830000
  pfn_end    : 838000
mem_map (263)
  mem_map    : ffffea001cc40000
  pfn_start  : 838000
  pfn_end    : 840000
mem_map (264)
  mem_map    : ffffea001ce00000
  pfn_start  : 840000
  pfn_end    : 848000
mem_map (265)
  mem_map    : ffffea001cfc0000
  pfn_start  : 848000
  pfn_end    : 850000
mem_map (266)
  mem_map    : ffffea001d180000
  pfn_start  : 850000
  pfn_end    : 858000
mem_map (267)
  mem_map    : ffffea001d340000
  pfn_start  : 858000
  pfn_end    : 860000
mem_map
Excluding unnecessary pages        : [  0 %] 
Excluding unnecessary pages        : [100 %] 
Excluding unnecessary pages        : [  0 %] 
Excluding unnecessary pages        : [100 %] 
 (268)
  mem_map    : ffffea001d500000
  pfn_start  : 860000
  pfn_end    : 868000
mem_map (269)
  mem_map    : ffffea001d6c0000
  pfn_start  : 868000
  pfn_end    : 870000
mem_map (270)
  mem_map    : ffffea001d880000
  pfn_start  : 870000
  pfn_end    : 878000
mem_map (271)
  mem_map    : ffffea001da40000
  pfn_start  : 878000
  pfn_end    : 880000
STEP [Excluding unnecessary pages] : 0.438936 seconds
STEP [Excluding unnecessary pages] : 0.467304 seconds
STEP [Copying data               ] : 0.624328 seconds
Writing erase info...
offset_eraseinfo: 6c0eb8, size_eraseinfo: 0

Original pages  : 0x00000000007ec289
  Excluded pages   : 0x00000000007b9efb
    Pages filled with zero  : 0x0000000000000000
    Cache pages             : 0x0000000000012cff
    Cache pages + private   : 0x0000000000012015
    User process data pages : 0x0000000000001ece
    Free pages              : 0x0000000000793319
  Remaining pages  : 0x000000000003238e
  (The number of pages is reduced to 2%.)
Memory Hole     : 0x0000000000093d77
--------------------------------------------------
Total pages     : 0x0000000000880000


The dumpfile is saved to /mnt///127.0.0.1-2012-12-07-16:45:20/vmcore-empty-2.

makedumpfile Completed.
[ perf record: Woken up 3 times to write data ]
[ perf record: Captured and wrote 0.598 MB /mnt///127.0.0.1-2012-12-07-16:45:20/perf.data2 (~26144 samples) ]
-------------- next part --------------
Failed to open [ext4], continuing without symbols
No kallsyms or vmlinux with build-id a77a2293aab413880b8b361bb5b863a1680c8eab was found
[qla2xxx] with build id a77a2293aab413880b8b361bb5b863a1680c8eab not found, continuing without symbols
Failed to open [dm_mirror], continuing without symbols
No kallsyms or vmlinux with build-id 8e4a472eadb14fb0cde985ef8571b543880472dd was found
[megaraid_sas] with build id 8e4a472eadb14fb0cde985ef8571b543880472dd not found, continuing without symbols
No kallsyms or vmlinux with build-id 93346fc362be38e207aeaae310a339fb502d9acb was found
[jbd2] with build id 93346fc362be38e207aeaae310a339fb502d9acb not found, continuing without symbols
# ========
# captured on: Fri Dec  7 16:45:43 2012
# hostname : (none)
# os release : 3.7.0-rc8-cliff-bench+
# perf version : 3.7.rc8.3.ge0fb22
# arch : x86_64
# nrcpus online : 1
# nrcpus avail : 1
# cpudesc : Intel(R) Xeon(R) CPU E7- 4820 @ 2.00GHz
# cpuid : GenuineIntel,6,47,2
# total memory : 240104 kB
# cmdline : /var/crash/perf record -g -o /mnt///127.0.0.1-2012-12-07-16:45:20/perf.data1 /var/crash/makedumpfile-cliff --message-level 31 -i /var/crash/vmcoreinfo.txt -N -o -d 31 /proc/vmcore /mnt///127.0.0.1-2012-12-07-16:45:20/vmcore-empty-1 
# event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_host = 0, excl_guest = 1, precise_ip = 0, id = { 2 }
# HEADER_CPU_TOPOLOGY info available, use -I to display
# HEADER_NUMA_TOPOLOGY info available, use -I to display
# pmu mappings: cpu = 4, software = 1, tracepoint = 2, uncore_bbox_0 = 15, uncore_bbox_1 = 16, uncore_cbox_0 = 7, uncore_cbox_1 = 8, uncore_cbox_2 = 9, uncore_cbox_3 = 10, uncore_cbox_4 = 11, uncore_cbox_5 = 12, uncore_cbox_6 = 13, uncore_cbox_7 = 14, uncore_mbox_0 = 19, uncore_mbox_1 = 20, uncore_rbox_0 = 21, uncore_rbox_1 = 22, uncore_sbox_0 = 17, uncore_sbox_1 = 18, breakpoint = 5, uncore_ubox = 6, uncore_wbox = 23
# ========
#
# Samples: 91K of event 'cycles'
# Event count (approx.): 23676246537
#
# Overhead          Command         Shared Object
# ........  ...............  ....................
#
    90.38%  makedumpfile-cl  [kernel.kallsyms]   
            |          
            |--19.73%-- __purge_vmap_area_lazy
            |          |          
            |          |--80.50%-- free_vmap_area_noflush
            |          |          free_unmap_vmap_area
            |          |          remove_vm_area
            |          |          iounmap
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          |          
            |          |          |--66.59%-- 0x0
            |          |          |          
            |          |           --33.41%-- 0x45524f4300000001
            |          |          
            |          |--19.43%-- vm_unmap_aliases
            |          |          change_page_attr_set_clr
            |          |          _set_memory_wb
            |          |          ioremap_change_attr
            |          |          kernel_map_sync_memtype
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |           --0.07%-- [...]
            |          
            |--15.58%-- try_preserve_large_page
            |          |          
            |          |--99.97%-- __change_page_attr
            |          |          __change_page_attr_set_clr
            |          |          change_page_attr_set_clr
            |          |          _set_memory_wb
            |          |          ioremap_change_attr
            |          |          kernel_map_sync_memtype
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |           --0.03%-- [...]
            |          
            |--14.51%-- iomem_map_sanity_check
            |          |          
            |          |--99.97%-- __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          |          
            |          |          |--50.01%-- 0x6e6d2f0065726f63
            |          |          |          
            |          |           --49.99%-- 0x45524f4300000001
            |           --0.03%-- [...]
            |          
            |--11.06%-- walk_system_ram_range
            |          |          
            |          |--64.71%-- pat_pagerange_is_ram
            |          |          |          
            |          |          |--50.87%-- free_memtype
            |          |          |          iounmap
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |           --49.13%-- reserve_memtype
            |          |                     __ioremap_caller
            |          |                     ioremap_cache
            |          |                     copy_oldmem_page
            |          |                     read_from_oldmem
            |          |                     read_vmcore
            |          |                     proc_reg_read
            |          |                     vfs_read
            |          |                     sys_read
            |          |                     system_call_fastpath
            |          |                     __read_nocancel
            |          |          
            |          |--34.75%-- page_is_ram
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |           --0.54%-- [...]
            |          
            |--4.84%-- __phys_addr
            |          |          
            |          |--52.48%-- __change_page_attr
            |          |          __change_page_attr_set_clr
            |          |          change_page_attr_set_clr
            |          |          _set_memory_wb
            |          |          ioremap_change_attr
            |          |          kernel_map_sync_memtype
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |          |--45.72%-- try_preserve_large_page
            |          |          __change_page_attr
            |          |          __change_page_attr_set_clr
            |          |          change_page_attr_set_clr
            |          |          _set_memory_wb
            |          |          ioremap_change_attr
            |          |          kernel_map_sync_memtype
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |           --1.80%-- [...]
            |          
            |--4.82%-- __get_vm_area_node
            |          |          
            |          |--99.70%-- get_vm_area_caller
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          |          
            |          |           --100.00%-- 0x0
            |           --0.30%-- [...]
            |          
            |--4.13%-- iounmap
            |          |          
            |          |--99.59%-- copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          |          
            |          |          |--50.39%-- 0x45524f4300000001
            |          |          |          
            |          |           --49.61%-- 0x0
            |           --0.41%-- [...]
            |          
            |--3.60%-- read_vmcore
            |          |          
            |          |--99.83%-- proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |           --0.17%-- [...]
            |          
            |--2.24%-- copy_user_generic_string
            |          read_from_oldmem
            |          read_vmcore
            |          proc_reg_read
            |          vfs_read
            |          sys_read
            |          system_call_fastpath
            |          __read_nocancel
            |          
            |--1.92%-- remove_vm_area
            |          |          
            |          |--99.31%-- iounmap
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          |          
            |          |           --100.00%-- 0x0
            |          |          
            |           --0.69%-- copy_oldmem_page
            |                     read_from_oldmem
            |                     read_vmcore
            |                     proc_reg_read
            |                     vfs_read
            |                     sys_read
            |                     system_call_fastpath
            |                     __read_nocancel
            |          
            |--1.82%-- do_kernel_range_flush
            |          |          
            |          |--99.20%-- on_each_cpu
            |          |          flush_tlb_kernel_range
            |          |          __purge_vmap_area_lazy
            |          |          free_vmap_area_noflush
            |          |          free_unmap_vmap_area
            |          |          remove_vm_area
            |          |          iounmap
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |           --0.80%-- flush_tlb_kernel_range
            |                     __purge_vmap_area_lazy
            |                     free_vmap_area_noflush
            |                     free_unmap_vmap_area
            |                     remove_vm_area
            |                     iounmap
            |                     copy_oldmem_page
            |                     read_from_oldmem
            |                     read_vmcore
            |                     proc_reg_read
            |                     vfs_read
            |                     sys_read
            |                     system_call_fastpath
            |                     __read_nocancel
            |          
            |--1.01%-- rbt_memtype_erase
            |          |          
            |          |--96.66%-- free_memtype
            |          |          iounmap
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |           --3.34%-- iounmap
            |                     copy_oldmem_page
            |                     read_from_oldmem
            |                     read_vmcore
            |                     proc_reg_read
            |                     vfs_read
            |                     sys_read
            |                     system_call_fastpath
            |                     __read_nocancel
            |          
            |--0.87%-- kfree
            |          |          
            |          |--55.52%-- free_memtype
            |          |          iounmap
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |          |--29.00%-- iounmap
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |          |--12.42%-- rcu_do_batch
            |          |          __rcu_process_callbacks
            |          |          rcu_process_callbacks
            |          |          __do_softirq
            |          |          call_softirq
            |          |          do_softirq
            |          |          irq_exit
            |          |          smp_apic_timer_interrupt
            |          |          apic_timer_interrupt
            |          |          |          
            |          |          |--20.23%-- free_vmap_area_noflush
            |          |          |          free_unmap_vmap_area
            |          |          |          remove_vm_area
            |          |          |          iounmap
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--19.11%-- __ioremap_caller
            |          |          |          ioremap_cache
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--16.82%-- __change_page_attr
            |          |          |          __change_page_attr_set_clr
            |          |          |          change_page_attr_set_clr
            |          |          |          _set_memory_wb
            |          |          |          ioremap_change_attr
            |          |          |          kernel_map_sync_memtype
            |          |          |          __ioremap_caller
            |          |          |          ioremap_cache
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--6.75%-- pat_pagerange_is_ram
            |          |          |          |          
            |          |          |          |--66.67%-- reserve_memtype
            |          |          |          |          __ioremap_caller
            |          |          |          |          ioremap_cache
            |          |          |          |          copy_oldmem_page
            |          |          |          |          read_from_oldmem
            |          |          |          |          read_vmcore
            |          |          |          |          proc_reg_read
            |          |          |          |          vfs_read
            |          |          |          |          sys_read
            |          |          |          |          system_call_fastpath
            |          |          |          |          __read_nocancel
            |          |          |          |          
            |          |          |           --33.33%-- free_memtype
            |          |          |                     iounmap
            |          |          |                     copy_oldmem_page
            |          |          |                     read_from_oldmem
            |          |          |                     read_vmcore
            |          |          |                     proc_reg_read
            |          |          |                     vfs_read
            |          |          |                     sys_read
            |          |          |                     system_call_fastpath
            |          |          |                     __read_nocancel
            |          |          |          
            |          |          |--5.62%-- vm_unmap_aliases
            |          |          |          change_page_attr_set_clr
            |          |          |          _set_memory_wb
            |          |          |          ioremap_change_attr
            |          |          |          kernel_map_sync_memtype
            |          |          |          __ioremap_caller
            |          |          |          ioremap_cache
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--4.50%-- proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--4.49%-- copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--3.37%-- get_vm_area_caller
            |          |          |          __ioremap_caller
            |          |          |          ioremap_cache
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--3.37%-- readmem
            |          |          |          
            |          |          |--2.25%-- page_is_ram
            |          |          |          __ioremap_caller
            |          |          |          ioremap_cache
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--2.25%-- __exclude_unnecessary_pages
            |          |          |          exclude_unnecessary_pages_cyclic
            |          |          |          writeout_dumpfile
            |          |          |          0x7fff6c26de6d
            |          |          |          0x64656b616d2f6873
            |          |          |          
            |          |          |--2.25%-- paddr_to_offset
            |          |          |          exclude_unnecessary_pages_cyclic
            |          |          |          |          
            |          |          |           --100.00%-- writeout_dumpfile
            |          |          |                     0x7fff6c26de6d
            |          |          |                     0x64656b616d2f6873
            |          |          |          
            |          |          |--1.13%-- try_preserve_large_page
            |          |          |          __change_page_attr
            |          |          |          __change_page_attr_set_clr
            |          |          |          change_page_attr_set_clr
            |          |          |          _set_memory_wb
            |          |          |          ioremap_change_attr
            |          |          |          kernel_map_sync_memtype
            |          |          |          __ioremap_caller
            |          |          |          ioremap_cache
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--1.12%-- reserve_memtype
            |          |          |          __ioremap_caller
            |          |          |          ioremap_cache
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--1.12%-- __lseek_nocancel
            |          |          |          
            |          |          |--1.12%-- proc_reg_llseek
            |          |          |          vfs_llseek
            |          |          |          sys_lseek
            |          |          |          system_call_fastpath
            |          |          |          __lseek_nocancel
            |          |          |          
            |          |          |--1.12%-- free_memtype
            |          |          |          iounmap
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--1.12%-- on_each_cpu
            |          |          |          flush_tlb_kernel_range
            |          |          |          __purge_vmap_area_lazy
            |          |          |          free_vmap_area_noflush
            |          |          |          free_unmap_vmap_area
            |          |          |          remove_vm_area
            |          |          |          iounmap
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |          |--1.12%-- __get_vm_area_node
            |          |          |          get_vm_area_caller
            |          |          |          __ioremap_caller
            |          |          |          ioremap_cache
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          
            |          |           --1.12%-- vtop4_x86_64
            |          |          
            |          |--2.09%-- copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |           --0.98%-- __rcu_process_callbacks
            |                     rcu_process_callbacks
            |                     __do_softirq
            |                     call_softirq
            |                     do_softirq
            |                     irq_exit
            |                     smp_apic_timer_interrupt
            |                     apic_timer_interrupt
            |                     |          
            |                     |--57.11%-- __change_page_attr
            |                     |          __change_page_attr_set_clr
            |                     |          change_page_attr_set_clr
            |                     |          _set_memory_wb
            |                     |          ioremap_change_attr
            |                     |          kernel_map_sync_memtype
            |                     |          __ioremap_caller
            |                     |          ioremap_cache
            |                     |          copy_oldmem_page
            |                     |          read_from_oldmem
            |                     |          read_vmcore
            |                     |          proc_reg_read
            |                     |          vfs_read
            |                     |          sys_read
            |                     |          system_call_fastpath
            |                     |          __read_nocancel
            |                     |          
            |                     |--14.30%-- flush_tlb_kernel_range
            |                     |          __purge_vmap_area_lazy
            |                     |          free_vmap_area_noflush
            |                     |          free_unmap_vmap_area
            |                     |          remove_vm_area
            |                     |          iounmap
            |                     |          copy_oldmem_page
            |                     |          read_from_oldmem
            |                     |          read_vmcore
            |                     |          proc_reg_read
            |                     |          vfs_read
            |                     |          sys_read
            |                     |          system_call_fastpath
            |                     |          __read_nocancel
            |                     |          
            |                     |--14.30%-- free_vmap_area_noflush
            |                     |          free_unmap_vmap_area
            |                     |          remove_vm_area
            |                     |          iounmap
            |                     |          copy_oldmem_page
            |                     |          read_from_oldmem
            |                     |          read_vmcore
            |                     |          proc_reg_read
            |                     |          vfs_read
            |                     |          sys_read
            |                     |          system_call_fastpath
            |                     |          __read_nocancel
            |                     |          
            |                      --14.30%-- copy_oldmem_page
            |                                read_from_oldmem
            |                                read_vmcore
            |                                proc_reg_read
            |                                vfs_read
            |                                sys_read
            |                                system_call_fastpath
            |                                __read_nocancel
            |          
            |--0.58%-- __insert_vmap_area
            |          |          
            |          |--98.32%-- alloc_vmap_area
            |          |          __get_vm_area_node
            |          |          get_vm_area_caller
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |           --1.68%-- __get_vm_area_node
            |                     get_vm_area_caller
            |                     __ioremap_caller
            |                     ioremap_cache
            |                     copy_oldmem_page
            |                     read_from_oldmem
            |                     read_vmcore
            |                     proc_reg_read
            |                     vfs_read
            |                     sys_read
            |                     system_call_fastpath
            |                     __read_nocancel
            |          
            |--0.57%-- kmem_cache_alloc_node_trace
            |          |          
            |          |--55.58%-- __get_vm_area_node
            |          |          get_vm_area_caller
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |          |--41.85%-- alloc_vmap_area
            |          |          __get_vm_area_node
            |          |          get_vm_area_caller
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |           --2.56%-- get_vm_area_caller
            |                     __ioremap_caller
            |                     ioremap_cache
            |                     copy_oldmem_page
            |                     read_from_oldmem
            |                     read_vmcore
            |                     proc_reg_read
            |                     vfs_read
            |                     sys_read
            |                     system_call_fastpath
            |                     __read_nocancel
            |          
            |--0.54%-- vfs_read
            |          |          
            |          |--98.21%-- sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          |          
            |          |           --100.00%-- 0x0
            |          |          
            |           --1.79%-- system_call_fastpath
            |                     __read_nocancel
            |          
            |--0.54%-- memtype_rb_check_conflict
            |          |          
            |          |--95.54%-- rbt_memtype_check_insert
            |          |          reserve_memtype
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |           --4.46%-- reserve_memtype
            |                     __ioremap_caller
            |                     ioremap_cache
            |                     copy_oldmem_page
            |                     read_from_oldmem
            |                     read_vmcore
            |                     proc_reg_read
            |                     vfs_read
            |                     sys_read
            |                     system_call_fastpath
            |                     __read_nocancel
            |          
            |--0.51%-- __mtrr_type_lookup
            |          |          
            |          |--96.91%-- mtrr_type_lookup
            |          |          reserve_memtype
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          
            |           --3.09%-- reserve_memtype
            |                     __ioremap_caller
            |                     ioremap_cache
            |                     copy_oldmem_page
            |                     read_from_oldmem
            |                     read_vmcore
            |                     proc_reg_read
            |                     vfs_read
            |                     sys_read
            |                     system_call_fastpath
            |                     __read_nocancel
             --11.15%-- [...]

     9.19%  makedumpfile-cl  makedumpfile-cliff  
            |          
            |--37.97%-- __exclude_unnecessary_pages
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff6c26de6d
            |                     0x64656b616d2f6873
            |          
            |--18.73%-- set_bitmap_cyclic
            |          |          
            |           --100.00%-- exclude_unnecessary_pages_cyclic
            |                     |          
            |                      --100.00%-- writeout_dumpfile
            |                                0x7fff6c26de6d
            |                                0x64656b616d2f6873
            |          
            |--13.79%-- paddr_to_offset
            |          |          
            |           --100.00%-- exclude_unnecessary_pages_cyclic
            |                     |          
            |                      --100.00%-- writeout_dumpfile
            |                                0x7fff6c26de6d
            |                                0x64656b616d2f6873
            |          
            |--4.71%-- readmem
            |          |          
            |           --100.00%-- exclude_unnecessary_pages_cyclic
            |                     writeout_dumpfile
            |                     0x7fff6c26de6d
            |                     0x64656b616d2f6873
            |          
            |--4.12%-- get_num_dumpable_cyclic
            |          
            |--2.90%-- is_in_same_page
            |          
            |--2.66%-- page_is_buddy_v3
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff6c26de6d
            |                     0x64656b616d2f6873
            |          
            |--2.37%-- clear_bit_on_2nd_bitmap_for_kernel
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff6c26de6d
            |                     0x64656b616d2f6873
            |          
            |--2.35%-- create_1st_bitmap_cyclic
            |          
            |--2.04%-- is_xen_memory
            |          |          
            |           --100.00%-- exclude_unnecessary_pages_cyclic
            |                     |          
            |                      --100.00%-- writeout_dumpfile
            |                                0x7fff6c26de6d
            |                                0x64656b616d2f6873
            |          
            |--2.02%-- vtop4_x86_64
            |          
            |--1.67%-- set_bit_on_1st_bitmap
            |          
            |--1.53%-- clear_bit_on_2nd_bitmap
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff6c26de6d
            |                     0x64656b616d2f6873
            |          
            |--1.25%-- write_kdump_pages_and_bitmap_cyclic
            |          writeout_dumpfile
            |          0x7fff6c26de6d
            |          0x64656b616d2f6873
            |          
            |--1.15%-- update_cyclic_region
            |          
            |--0.66%-- vaddr_to_paddr_x86_64
             --0.07%-- [...]

     0.42%  makedumpfile-cl  libc.so.6           
            |          
            |--40.25%-- __lseek_nocancel
            |          
            |--36.91%-- __read_nocancel
            |          
            |--8.64%-- __GI___libc_read
            |          
            |--5.01%-- __memset_sse2
            |          |          
            |           --100.00%-- 0x7fff6c26de6d
            |                     0x64656b616d2f6873
            |          
            |--3.90%-- __GI___libc_lseek64
            |          
            |--3.72%-- memcpy
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff6c26de6d
            |                     0x64656b616d2f6873
            |          
            |--0.53%-- memchr
             --1.04%-- [...]

     0.01%  makedumpfile-cl  ld-linux-x86-64.so.2
            |          
            |--49.69%-- strcmp
            |          |          
            |          |--67.41%-- 0x8922974
            |          |          0x42494c4700342e33
            |          |          
            |           --32.59%-- 0x9691a75
            |                     0x42494c4700352e32
            |          
            |--17.46%-- _dl_name_match_p
            |          _dl_check_all_versions
            |          
            |--16.51%-- do_lookup_x
            |          
             --16.34%-- _dl_lookup_symbol_x
                       _dl_relocate_object
                       dl_main
                       _dl_sysdep_start
                       0x4156415741e58948

     0.00%  makedumpfile-cl  libstdc++.so.6      
            |
            --- 0x37282bb470
                0x3728253b43
                0x7fff6c26de6d
                0x64656b616d2f6873

     0.00%  makedumpfile-cl  [megaraid_sas]      
            |
            --- megasas_isr
                handle_irq_event_percpu
                handle_irq_event
                handle_edge_irq
                handle_irq
                do_IRQ
                ret_from_intr
                __exclude_unnecessary_pages
                exclude_unnecessary_pages_cyclic
                writeout_dumpfile
                0x7fff6c26de6d
                0x64656b616d2f6873

     0.00%  makedumpfile-cl  [qla2xxx]           
            |
            --- qla24xx_mbx_completion
                qla24xx_msix_default
                handle_irq_event_percpu
                handle_irq_event
                handle_edge_irq
                handle_irq
                do_IRQ
                ret_from_intr
                __change_page_attr
                __change_page_attr_set_clr
                change_page_attr_set_clr
                _set_memory_wb
                ioremap_change_attr
                kernel_map_sync_memtype
                __ioremap_caller
                ioremap_cache
                copy_oldmem_page
                read_from_oldmem
                read_vmcore
                proc_reg_read
                vfs_read
                sys_read
                system_call_fastpath
                __read_nocancel

     0.00%  makedumpfile-cl  [jbd2]              
            |
            --- jbd2_journal_start
                ext4_dirty_inode
                __mark_inode_dirty
                update_time
                file_update_time
                __generic_file_aio_write
                generic_file_aio_write
                ext4_file_write
                do_sync_write
                vfs_write
                sys_write
                system_call_fastpath
                __write_nocancel
                0xffffff0000003725



-------------- next part --------------
Failed to open [dm_mirror], continuing without symbols
Failed to open [ext4], continuing without symbols
# ========
# captured on: Fri Dec  7 16:45:46 2012
# hostname : (none)
# os release : 3.7.0-rc8-cliff-bench+
# perf version : 3.7.rc8.3.ge0fb22
# arch : x86_64
# nrcpus online : 1
# nrcpus avail : 1
# cpudesc : Intel(R) Xeon(R) CPU E7- 4820 @ 2.00GHz
# cpuid : GenuineIntel,6,47,2
# total memory : 240104 kB
# cmdline : /var/crash/perf record -g -o /mnt///127.0.0.1-2012-12-07-16:45:20/perf.data2 /var/crash/makedumpfile-cliff --message-level 31 -i /var/crash/vmcoreinfo.txt -N -d 31 /proc/vmcore /mnt///127.0.0.1-2012-12-07-16:45:20/vmcore-empty-2 
# event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_kern = 0, excl_host = 0, excl_guest = 1, precise_ip = 0, id = { 3 }
# HEADER_CPU_TOPOLOGY info available, use -I to display
# HEADER_NUMA_TOPOLOGY info available, use -I to display
# pmu mappings: cpu = 4, software = 1, tracepoint = 2, uncore_bbox_0 = 15, uncore_bbox_1 = 16, uncore_cbox_0 = 7, uncore_cbox_1 = 8, uncore_cbox_2 = 9, uncore_cbox_3 = 10, uncore_cbox_4 = 11, uncore_cbox_5 = 12, uncore_cbox_6 = 13, uncore_cbox_7 = 14, uncore_mbox_0 = 19, uncore_mbox_1 = 20, uncore_rbox_0 = 21, uncore_rbox_1 = 22, uncore_sbox_0 = 17, uncore_sbox_1 = 18, breakpoint = 5, uncore_ubox = 6, uncore_wbox = 23
# ========
#
# Samples: 5K of event 'cycles'
# Event count (approx.): 1493942335
#
# Overhead          Command         Shared Object
# ........  ...............  ....................
#
    51.45%  makedumpfile-cl  makedumpfile-cliff  
            |          
            |--51.45%-- set_bitmap_cyclic
            |          |          
            |           --100.00%-- exclude_unnecessary_pages_cyclic
            |                     |          
            |                      --100.00%-- writeout_dumpfile
            |                                0x7fff0b66fe70
            |                                0x64656b616d2f6873
            |          
            |--11.66%-- get_num_dumpable_cyclic
            |          
            |--7.96%-- clear_bit_on_2nd_bitmap_for_kernel
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff0b66fe70
            |                     0x64656b616d2f6873
            |          
            |--6.93%-- create_1st_bitmap_cyclic
            |          
            |--4.52%-- __exclude_unnecessary_pages_kernel
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff0b66fe70
            |                     0x64656b616d2f6873
            |          
            |--4.35%-- clear_bit_on_2nd_bitmap
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff0b66fe70
            |                     0x64656b616d2f6873
            |          
            |--4.05%-- set_bit_on_1st_bitmap
            |          
            |--3.63%-- update_cyclic_region
            |          
            |--3.52%-- write_kdump_pages_and_bitmap_cyclic
            |          writeout_dumpfile
            |          0x7fff0b66fe70
            |          0x64656b616d2f6873
            |          
            |--1.87%-- is_xen_memory
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff0b66fe70
            |                     0x64656b616d2f6873
             --0.07%-- [...]

    47.68%  makedumpfile-cl  [kernel.kallsyms]   
            |          
            |--77.89%-- write_vmcore_get_excludes
            |          write_vmcore_pfn_lists
            |          proc_reg_write
            |          vfs_write
            |          sys_write
            |          system_call_fastpath
            |          __write_nocancel
            |          exclude_unnecessary_pages_cyclic
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff0b66fe70
            |                     0x64656b616d2f6873
            |          
            |--15.34%-- walk_system_ram_range
            |          |          
            |          |--96.92%-- page_is_ram
            |          |          __ioremap_caller
            |          |          ioremap_cache
            |          |          |          
            |          |          |--99.51%-- write_vmcore_get_memmap
            |          |          |          write_vmcore_pfn_lists
            |          |          |          proc_reg_write
            |          |          |          vfs_write
            |          |          |          sys_write
            |          |          |          system_call_fastpath
            |          |          |          __write_nocancel
            |          |          |          0x7fff0b66fe70
            |          |          |          0x64656b616d2f6873
            |          |           --0.49%-- [...]
            |          |          
            |          |--2.84%-- pat_pagerange_is_ram
            |          |          |          
            |          |          |--58.30%-- free_memtype
            |          |          |          iounmap
            |          |          |          copy_oldmem_page
            |          |          |          read_from_oldmem
            |          |          |          read_vmcore
            |          |          |          proc_reg_read
            |          |          |          vfs_read
            |          |          |          sys_read
            |          |          |          system_call_fastpath
            |          |          |          __read_nocancel
            |          |          |          |          
            |          |          |           --100.00%-- 0x45524f4300000001
            |          |          |          
            |          |           --41.70%-- reserve_memtype
            |          |                     __ioremap_caller
            |          |                     ioremap_cache
            |          |                     copy_oldmem_page
            |          |                     read_from_oldmem
            |          |                     read_vmcore
            |          |                     proc_reg_read
            |          |                     vfs_read
            |          |                     sys_read
            |          |                     system_call_fastpath
            |          |                     __read_nocancel
            |           --0.24%-- [...]
            |          
            |--0.76%-- __purge_vmap_area_lazy
            |          |          
            |          |--76.20%-- free_vmap_area_noflush
            |          |          free_unmap_vmap_area
            |          |          remove_vm_area
            |          |          iounmap
            |          |          copy_oldmem_page
            |          |          read_from_oldmem
            |          |          read_vmcore
            |          |          proc_reg_read
            |          |          vfs_read
            |          |          sys_read
            |          |          system_call_fastpath
            |          |          __read_nocancel
            |          |          |          
            |          |          |--50.02%-- 0x45524f4300000001
            |          |          |          
            |          |           --49.98%-- 0x0
            |          |          
            |           --23.80%-- vm_unmap_aliases
            |                     change_page_attr_set_clr
            |                     _set_memory_wb
            |                     ioremap_change_attr
            |                     kernel_map_sync_memtype
            |                     __ioremap_caller
            |                     ioremap_cache
            |                     copy_oldmem_page
            |                     read_from_oldmem
            |                     read_vmcore
            |                     proc_reg_read
            |                     vfs_read
            |                     sys_read
            |                     system_call_fastpath
            |                     __read_nocancel
            |          
            |--0.66%-- iomem_map_sanity_check
            |          __ioremap_caller
            |          ioremap_cache
            |          copy_oldmem_page
            |          read_from_oldmem
            |          read_vmcore
            |          proc_reg_read
            |          vfs_read
            |          sys_read
            |          system_call_fastpath
            |          __read_nocancel
            |          |          
            |          |--50.44%-- 0x45524f4300000001
            |          |          
            |           --49.56%-- 0x0
            |          
            |--0.51%-- try_preserve_large_page
            |          __change_page_attr
            |          __change_page_attr_set_clr
            |          change_page_attr_set_clr
            |          _set_memory_wb
            |          ioremap_change_attr
            |          kernel_map_sync_memtype
            |          __ioremap_caller
            |          ioremap_cache
            |          copy_oldmem_page
            |          read_from_oldmem
            |          read_vmcore
            |          proc_reg_read
            |          vfs_read
            |          sys_read
            |          system_call_fastpath
            |          __read_nocancel
             --4.84%-- [...]

     0.72%  makedumpfile-cl  libc.so.6           
            |          
            |--36.59%-- __memset_sse2
            |          |          
            |           --100.00%-- 0x7fff0b66fe70
            |                     0x64656b616d2f6873
            |          
            |--31.88%-- memcpy
            |          |          
            |           --100.00%-- writeout_dumpfile
            |                     0x7fff0b66fe70
            |                     0x64656b616d2f6873
            |          
            |--4.88%-- time
            |          
            |--4.80%-- _IO_file_xsputn@@GLIBC_2.2.5
            |          0x7f7e97029000
            |          
            |--2.46%-- _IO_file_init@@GLIBC_2.2.5
            |          
            |--2.45%-- _int_free
            |          
            |--2.45%-- 0x372527ffa0
            |          
            |--2.44%-- _IO_default_xsputn
            |          0x71e4ef
            |          
            |--2.42%-- __lseek_nocancel
            |          
            |--2.41%-- _IO_getline_info
            |          
            |--2.41%-- __strlen_sse42
            |          0x61705f6769746e6f
            |          
            |--2.41%-- _IO_fgets
            |          0x3638343533313d45
            |          
             --2.40%-- vfprintf
                       fprintf

     0.13%  makedumpfile-cl  ld-linux-x86-64.so.2
            |          
            |--28.61%-- _dl_relocate_object
            |          dl_main
            |          _dl_sysdep_start
            |          0x4156415741e58948
            |          
            |--28.61%-- do_lookup_x
            |          
            |--14.96%-- strcmp
            |          0x6e696c2d646c0036
            |          
            |--14.34%-- _dl_lookup_symbol_x
            |          _dl_relocate_object
            |          dl_main
            |          _dl_sysdep_start
            |          0x4156415741e58948
            |          
             --13.48%-- _dl_sort_fini
                       _dl_fini
                       exit

     0.02%  makedumpfile-cl  libstdc++.so.6      
            |
            --- std::basic_ios<char, std::char_traits<char> >::init(std::basic_streambuf<char, std::char_traits<char> >*)
                0x37284ebbe0
                std::basic_ostream<char, std::char_traits<char> >::~basic_ostream()





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