On 4/26/23 7:13 PM, Peter Xu wrote:
> Hi, Muhammad,
>
> On Wed, Apr 26, 2023 at 12:06:23PM +0500, Muhammad Usama Anjum wrote:
>> On 4/20/23 11:01 AM, Muhammad Usama Anjum wrote:
>>> +/* Supported flags */
>>> +#define PM_SCAN_OP_GET (1 << 0)
>>> +#define PM_SCAN_OP_WP (1 << 1)
>> We have only these flag options available in PAGEMAP_SCAN IOCTL.
>> PM_SCAN_OP_GET must always be specified for this IOCTL. PM_SCAN_OP_WP can
>> be specified as need. But PM_SCAN_OP_WP cannot be specified without
>> PM_SCAN_OP_GET. (This was removed after you had asked me to not duplicate
>> functionality which can be achieved by UFFDIO_WRITEPROTECT.)
>>
>> 1) PM_SCAN_OP_GET | PM_SCAN_OP_WP
>> vs
>> 2) UFFDIO_WRITEPROTECT
>>
>> After removing the usage of uffd_wp_range() from PAGEMAP_SCAN IOCTL, we are
>> getting really good performance which is comparable just like we are
>> depending on SOFT_DIRTY flags in the PTE. But when we want to perform wp,
>> PM_SCAN_OP_GET | PM_SCAN_OP_WP is more desirable than UFFDIO_WRITEPROTECT
>> performance and behavior wise.
>>
>> I've got the results from someone else that UFFDIO_WRITEPROTECT block
>> pagefaults somehow which PAGEMAP_IOCTL doesn't. I still need to verify this
>> as I don't have tests comparing them one-to-one.
>>
>> What are your thoughts about it? Have you thought about making
>> UFFDIO_WRITEPROTECT perform better?
>>
>> I'm sorry to mention the word "performance" here. Actually we want better
>> performance to emulate Windows syscall. That is why we are adding this
>> functionality. So either we need to see what can be improved in
>> UFFDIO_WRITEPROTECT or can I please add only PM_SCAN_OP_WP back in
>> pagemap_ioctl?
>
> I'm fine if you want to add it back if it works for you. Though before
> that, could you remind me why there can be a difference on performance?
I've looked at the code again and I think I've found something. Lets look
at exact performance numbers:
I've run 2 different tests. In first test UFFDIO_WRITEPROTECT is being used
for engaging WP. In second test PM_SCAN_OP_WP is being used. I've measured
the average write time to the same memory which is being WP-ed and total
time of execution of these APIs:
**avg write time:**
| No of pages | 2000 | 8192 | 100000 | 500000 |
|------------------------|------|------|--------|--------|
| UFFDIO_WRITEPROTECT | 2200 | 2300 | 4100 | 4200 |
| PM_SCAN_OP_WP | 2000 | 2300 | 2500 | 2800 |
**Execution time measured in rdtsc:**
| No of pages | 2000 | 8192 | 100000 | 500000 |
|------------------------|------|-------|--------|--------|
| UFFDIO_WRITEPROTECT | 3200 | 14000 | 59000 | 58000 |
| PM_SCAN_OP_WP | 1900 | 7000 | 38000 | 40000 |
Avg write time for UFFDIO_WRITEPROTECT is 1.3 times slow. The execution
time is 1.5 times slower in the case of UFFDIO_WRITEPROTECT. So
UFFDIO_WRITEPROTECT is making writes slower to the pages and execution time
is also slower.
This proves that PM_SCAN_OP_WP is better than UFFDIO_WRITEPROTECT. Although
PM_SCAN_OP_WP and UFFDIO_WRITEPROTECT have been implemented differently. We
should have seen no difference in performance. But we have quite a lot of
difference in performance here. PM_SCAN_OP_WP takes read mm lock, uses
walk_page_range() to walk over pages which finds VMAs from address ranges
to walk over them and pagemap_scan_pmd_entry() is handling most of the work
including tlb flushing. UFFDIO_WRITEPROTECT is also taking the mm lock and
iterating from all the different page directories until a pte is found and
then flags are updated there and tlb is flushed for every pte.
My next deduction would be that we are getting worse performance as we are
flushing tlb for one page at a time in case of UFFDIO_WRITEPROTECT. While
we flush tlb for 512 pages (moslty) at a time in case of PM_SCAN_OP_WP.
I've just verified this by adding some logs to the change_pte_range() and
pagemap_scan_pmd_entry(). Logs are attached. I've allocated memory of 1000
pages and write-protected it with UFFDIO_WRITEPROTECT and PM_SCAN_OP_WP.
The logs show that UFFDIO_WRITEPROTECT has flushed tlb 1000 times of size 1
page each time. While PM_SCAN_OP_WP has flushed only 3 times of bigger
sizes. I've learned over my last experience that tlb flush is very
expensive. Probably this is what we need to improve if we don't want to add
PM_SCAN_OP_WP?
The UFFDIO_WRITEPROTECT uses change_pte_range() which is very generic
function and I'm not sure if can try to not do tlb flushes if uffd_wp is
true. We can try to do flush somewhere else and hopefully we should do only
one flush if possible. It will not be so straight forward to move away from
generic fundtion. Thoughts?
> Thanks,
>
--
BR,
Muhammad Usama Anjum
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[ 59.331355] change_pte_range 7FAB8EFE4000 1000
[ 59.331664] change_pte_range 7FAB8EFE5000 1000
[ 59.331982] change_pte_range 7FAB8EFE6000 1000
[ 59.332296] change_pte_range 7FAB8EFE7000 1000
[ 59.332610] change_pte_range 7FAB8EFE8000 1000
[ 59.332928] change_pte_range 7FAB8EFE9000 1000
[ 59.333250] change_pte_range 7FAB8EFEA000 1000
[ 59.333567] change_pte_range 7FAB8EFEB000 1000
[ 59.333891] change_pte_range 7FAB8EFEC000 1000
[ 59.334206] change_pte_range 7FAB8EFED000 1000
[ 59.334522] change_pte_range 7FAB8EFEE000 1000
[ 59.334839] change_pte_range 7FAB8EFEF000 1000
[ 59.335167] change_pte_range 7FAB8EFF0000 1000
[ 59.335480] change_pte_range 7FAB8EFF1000 1000
[ 59.335798] change_pte_range 7FAB8EFF2000 1000
[ 59.336111] change_pte_range 7FAB8EFF3000 1000
[ 59.336424] change_pte_range 7FAB8EFF4000 1000
[ 59.336746] change_pte_range 7FAB8EFF5000 1000
[ 59.337069] change_pte_range 7FAB8EFF6000 1000
[ 59.337383] change_pte_range 7FAB8EFF7000 1000
[ 59.337705] change_pte_range 7FAB8EFF8000 1000
[ 59.338018] change_pte_range 7FAB8EFF9000 1000
[ 59.338329] change_pte_range 7FAB8EFFA000 1000
[ 59.338641] change_pte_range 7FAB8EFFB000 1000
[ 59.338962] change_pte_range 7FAB8EFFC000 1000
[ 59.339278] change_pte_range 7FAB8EFFD000 1000
[ 59.339587] change_pte_range 7FAB8EFFE000 1000
[ 59.339905] change_pte_range 7FAB8EFFF000 1000
[ 59.340236] change_pte_range 7FAB8F000000 1000
[ 59.340599] change_pte_range 7FAB8F001000 1000
[ 59.340932] change_pte_range 7FAB8F002000 1000
[ 59.341248] change_pte_range 7FAB8F003000 1000
[ 59.341557] change_pte_range 7FAB8F004000 1000
[ 59.341877] change_pte_range 7FAB8F005000 1000
[ 59.342191] change_pte_range 7FAB8F006000 1000
[ 59.342507] change_pte_range 7FAB8F007000 1000
[ 59.342828] change_pte_range 7FAB8F008000 1000
[ 59.343149] change_pte_range 7FAB8F009000 1000
[ 59.343463] change_pte_range 7FAB8F00A000 1000
[ 59.343787] change_pte_range 7FAB8F00B000 1000
[ 59.344102] change_pte_range 7FAB8F00C000 1000
[ 59.344421] change_pte_range 7FAB8F00D000 1000
[ 59.344745] change_pte_range 7FAB8F00E000 1000
[ 59.345063] change_pte_range 7FAB8F00F000 1000
[ 59.345381] change_pte_range 7FAB8F010000 1000
[ 59.345692] change_pte_range 7FAB8F011000 1000
[ 59.346016] change_pte_range 7FAB8F012000 1000
[ 59.346333] change_pte_range 7FAB8F013000 1000
[ 59.346644] change_pte_range 7FAB8F014000 1000
[ 59.346971] change_pte_range 7FAB8F015000 1000
[ 59.347295] change_pte_range 7FAB8F016000 1000
[ 59.347617] change_pte_range 7FAB8F017000 1000
[ 59.347949] change_pte_range 7FAB8F018000 1000
[ 59.348277] change_pte_range 7FAB8F019000 1000
[ 59.348598] change_pte_range 7FAB8F01A000 1000
[ 59.348932] change_pte_range 7FAB8F01B000 1000
[ 59.349257] change_pte_range 7FAB8F01C000 1000
[ 59.349584] change_pte_range 7FAB8F01D000 1000
[ 59.349918] change_pte_range 7FAB8F01E000 1000
[ 59.350243] change_pte_range 7FAB8F01F000 1000
[ 59.350562] change_pte_range 7FAB8F020000 1000
[ 59.350888] change_pte_range 7FAB8F021000 1000
[ 59.351220] change_pte_range 7FAB8F022000 1000
[ 59.351540] change_pte_range 7FAB8F023000 1000
[ 59.351867] change_pte_range 7FAB8F024000 1000
[ 59.352189] change_pte_range 7FAB8F025000 1000
[ 59.352509] change_pte_range 7FAB8F026000 1000
[ 59.352835] change_pte_range 7FAB8F027000 1000
[ 59.353156] change_pte_range 7FAB8F028000 1000
[ 59.353477] change_pte_range 7FAB8F029000 1000
[ 59.353807] change_pte_range 7FAB8F02A000 1000
[ 59.354118] change_pte_range 7FAB8F02B000 1000
[ 59.354430] change_pte_range 7FAB8F02C000 1000
[ 59.354747] change_pte_range 7FAB8F02D000 1000
[ 59.355059] change_pte_range 7FAB8F02E000 1000
[ 59.355378] change_pte_range 7FAB8F02F000 1000
[ 59.355704] change_pte_range 7FAB8F030000 1000
[ 59.356020] change_pte_range 7FAB8F031000 1000
[ 59.356330] change_pte_range 7FAB8F032000 1000
[ 59.356661] change_pte_range 7FAB8F033000 1000
[ 59.357013] change_pte_range 7FAB8F034000 1000
[ 59.357348] change_pte_range 7FAB8F035000 1000
[ 59.357658] change_pte_range 7FAB8F036000 1000
[ 59.357986] change_pte_range 7FAB8F037000 1000
[ 59.358304] change_pte_range 7FAB8F038000 1000
[ 59.358619] change_pte_range 7FAB8F039000 1000
[ 59.358940] change_pte_range 7FAB8F03A000 1000
[ 59.359258] change_pte_range 7FAB8F03B000 1000
[ 59.359570] change_pte_range 7FAB8F03C000 1000
[ 59.359890] change_pte_range 7FAB8F03D000 1000
[ 59.360206] change_pte_range 7FAB8F03E000 1000
[ 59.360517] change_pte_range 7FAB8F03F000 1000
[ 59.360840] change_pte_range 7FAB8F040000 1000
[ 59.361155] change_pte_range 7FAB8F041000 1000
[ 59.361470] change_pte_range 7FAB8F042000 1000
[ 59.361783] change_pte_range 7FAB8F043000 1000
[ 59.362097] change_pte_range 7FAB8F044000 1000
[ 59.362409] change_pte_range 7FAB8F045000 1000
[ 59.362721] change_pte_range 7FAB8F046000 1000
[ 59.363036] change_pte_range 7FAB8F047000 1000
[ 59.363354] change_pte_range 7FAB8F048000 1000
[ 59.363666] change_pte_range 7FAB8F049000 1000
[ 59.363982] change_pte_range 7FAB8F04A000 1000
[ 59.364293] change_pte_range 7FAB8F04B000 1000
[ 59.364609] change_pte_range 7FAB8F04C000 1000
[ 59.364930] change_pte_range 7FAB8F04D000 1000
[ 59.365239] change_pte_range 7FAB8F04E000 1000
[ 59.365555] change_pte_range 7FAB8F04F000 1000
[ 59.365873] change_pte_range 7FAB8F050000 1000
[ 59.366189] change_pte_range 7FAB8F051000 1000
[ 59.366495] change_pte_range 7FAB8F052000 1000
[ 59.366816] change_pte_range 7FAB8F053000 1000
[ 59.367134] change_pte_range 7FAB8F054000 1000
[ 59.367450] change_pte_range 7FAB8F055000 1000
[ 59.367775] change_pte_range 7FAB8F056000 1000
[ 59.368091] change_pte_range 7FAB8F057000 1000
[ 59.368411] change_pte_range 7FAB8F058000 1000
[ 59.368738] change_pte_range 7FAB8F059000 1000
[ 59.369059] change_pte_range 7FAB8F05A000 1000
[ 59.369372] change_pte_range 7FAB8F05B000 1000
[ 59.369684] change_pte_range 7FAB8F05C000 1000
[ 59.370011] change_pte_range 7FAB8F05D000 1000
[ 59.370324] change_pte_range 7FAB8F05E000 1000
[ 59.370637] change_pte_range 7FAB8F05F000 1000
[ 59.370959] change_pte_range 7FAB8F060000 1000
[ 59.371276] change_pte_range 7FAB8F061000 1000
[ 59.371594] change_pte_range 7FAB8F062000 1000
[ 59.371910] change_pte_range 7FAB8F063000 1000
[ 59.372225] change_pte_range 7FAB8F064000 1000
[ 59.372538] change_pte_range 7FAB8F065000 1000
[ 59.372866] change_pte_range 7FAB8F066000 1000
[ 59.373181] change_pte_range 7FAB8F067000 1000
[ 59.373499] change_pte_range 7FAB8F068000 1000
[ 59.373858] change_pte_range 7FAB8F069000 1000
[ 59.374192] change_pte_range 7FAB8F06A000 1000
[ 59.374519] change_pte_range 7FAB8F06B000 1000
[ 59.374840] change_pte_range 7FAB8F06C000 1000
[ 59.375163] change_pte_range 7FAB8F06D000 1000
[ 59.375475] change_pte_range 7FAB8F06E000 1000
[ 59.375799] change_pte_range 7FAB8F06F000 1000
[ 59.376113] change_pte_range 7FAB8F070000 1000
[ 59.376431] change_pte_range 7FAB8F071000 1000
[ 59.376756] change_pte_range 7FAB8F072000 1000
[ 59.377069] change_pte_range 7FAB8F073000 1000
[ 59.377383] change_pte_range 7FAB8F074000 1000
[ 59.377707] change_pte_range 7FAB8F075000 1000
[ 59.378020] change_pte_range 7FAB8F076000 1000
[ 59.378342] change_pte_range 7FAB8F077000 1000
[ 59.378659] change_pte_range 7FAB8F078000 1000
[ 59.378980] change_pte_range 7FAB8F079000 1000
[ 59.379297] change_pte_range 7FAB8F07A000 1000
[ 59.379614] change_pte_range 7FAB8F07B000 1000
[ 59.379935] change_pte_range 7FAB8F07C000 1000
[ 59.380249] change_pte_range 7FAB8F07D000 1000
[ 59.380561] change_pte_range 7FAB8F07E000 1000
[ 59.380882] change_pte_range 7FAB8F07F000 1000
[ 59.381198] change_pte_range 7FAB8F080000 1000
[ 59.381515] change_pte_range 7FAB8F081000 1000
[ 59.381835] change_pte_range 7FAB8F082000 1000
[ 59.382146] change_pte_range 7FAB8F083000 1000
[ 59.382460] change_pte_range 7FAB8F084000 1000
[ 59.382783] change_pte_range 7FAB8F085000 1000
[ 59.383103] change_pte_range 7FAB8F086000 1000
[ 59.383420] change_pte_range 7FAB8F087000 1000
[ 59.383739] change_pte_range 7FAB8F088000 1000
[ 59.384057] change_pte_range 7FAB8F089000 1000
[ 59.384371] change_pte_range 7FAB8F08A000 1000
[ 59.384685] change_pte_range 7FAB8F08B000 1000
[ 59.385013] change_pte_range 7FAB8F08C000 1000
[ 59.385337] change_pte_range 7FAB8F08D000 1000
[ 59.385664] change_pte_range 7FAB8F08E000 1000
[ 59.385994] change_pte_range 7FAB8F08F000 1000
[ 59.386318] change_pte_range 7FAB8F090000 1000
[ 59.386641] change_pte_range 7FAB8F091000 1000
[ 59.386971] change_pte_range 7FAB8F092000 1000
[ 59.387303] change_pte_range 7FAB8F093000 1000
[ 59.387628] change_pte_range 7FAB8F094000 1000
[ 59.387951] change_pte_range 7FAB8F095000 1000
[ 59.388265] change_pte_range 7FAB8F096000 1000
[ 59.388588] change_pte_range 7FAB8F097000 1000
[ 59.388923] change_pte_range 7FAB8F098000 1000
[ 59.389246] change_pte_range 7FAB8F099000 1000
[ 59.389579] change_pte_range 7FAB8F09A000 1000
[ 59.389917] change_pte_range 7FAB8F09B000 1000
[ 59.390265] change_pte_range 7FAB8F09C000 1000
[ 59.390585] change_pte_range 7FAB8F09D000 1000
[ 59.390911] change_pte_range 7FAB8F09E000 1000
[ 59.391259] change_pte_range 7FAB8F09F000 1000
[ 59.391575] change_pte_range 7FAB8F0A0000 1000
[ 59.391903] change_pte_range 7FAB8F0A1000 1000
[ 59.392215] change_pte_range 7FAB8F0A2000 1000
[ 59.392532] change_pte_range 7FAB8F0A3000 1000
[ 59.392845] change_pte_range 7FAB8F0A4000 1000
[ 59.393159] change_pte_range 7FAB8F0A5000 1000
[ 59.393476] change_pte_range 7FAB8F0A6000 1000
[ 59.393797] change_pte_range 7FAB8F0A7000 1000
[ 59.394111] change_pte_range 7FAB8F0A8000 1000
[ 59.394425] change_pte_range 7FAB8F0A9000 1000
[ 59.394746] change_pte_range 7FAB8F0AA000 1000
[ 59.395069] change_pte_range 7FAB8F0AB000 1000
[ 59.395384] change_pte_range 7FAB8F0AC000 1000
[ 59.395713] change_pte_range 7FAB8F0AD000 1000
[ 59.396028] change_pte_range 7FAB8F0AE000 1000
[ 59.396354] change_pte_range 7FAB8F0AF000 1000
[ 59.396675] change_pte_range 7FAB8F0B0000 1000
[ 59.396997] change_pte_range 7FAB8F0B1000 1000
[ 59.397309] change_pte_range 7FAB8F0B2000 1000
[ 59.397621] change_pte_range 7FAB8F0B3000 1000
[ 59.397937] change_pte_range 7FAB8F0B4000 1000
[ 59.398247] change_pte_range 7FAB8F0B5000 1000
[ 59.398560] change_pte_range 7FAB8F0B6000 1000
[ 59.398884] change_pte_range 7FAB8F0B7000 1000
[ 59.399211] change_pte_range 7FAB8F0B8000 1000
[ 59.399526] change_pte_range 7FAB8F0B9000 1000
[ 59.399848] change_pte_range 7FAB8F0BA000 1000
[ 59.400163] change_pte_range 7FAB8F0BB000 1000
[ 59.400485] change_pte_range 7FAB8F0BC000 1000
[ 59.400809] change_pte_range 7FAB8F0BD000 1000
[ 59.401121] change_pte_range 7FAB8F0BE000 1000
[ 59.401447] change_pte_range 7FAB8F0BF000 1000
[ 59.401769] change_pte_range 7FAB8F0C0000 1000
[ 59.402081] change_pte_range 7FAB8F0C1000 1000
[ 59.402392] change_pte_range 7FAB8F0C2000 1000
[ 59.402715] change_pte_range 7FAB8F0C3000 1000
[ 59.403032] change_pte_range 7FAB8F0C4000 1000
[ 59.403357] change_pte_range 7FAB8F0C5000 1000
[ 59.403673] change_pte_range 7FAB8F0C6000 1000
[ 59.403993] change_pte_range 7FAB8F0C7000 1000
[ 59.404308] change_pte_range 7FAB8F0C8000 1000
[ 59.404627] change_pte_range 7FAB8F0C9000 1000
[ 59.404950] change_pte_range 7FAB8F0CA000 1000
[ 59.405267] change_pte_range 7FAB8F0CB000 1000
[ 59.405578] change_pte_range 7FAB8F0CC000 1000
[ 59.405903] change_pte_range 7FAB8F0CD000 1000
[ 59.406268] change_pte_range 7FAB8F0CE000 1000
[ 59.406576] change_pte_range 7FAB8F0CF000 1000
[ 59.406903] change_pte_range 7FAB8F0D0000 1000
[ 59.407226] change_pte_range 7FAB8F0D1000 1000
[ 59.407534] change_pte_range 7FAB8F0D2000 1000
[ 59.407853] change_pte_range 7FAB8F0D3000 1000
[ 59.408170] change_pte_range 7FAB8F0D4000 1000
[ 59.408488] change_pte_range 7FAB8F0D5000 1000
[ 59.408812] change_pte_range 7FAB8F0D6000 1000
[ 59.409127] change_pte_range 7FAB8F0D7000 1000
[ 59.409447] change_pte_range 7FAB8F0D8000 1000
[ 59.409772] change_pte_range 7FAB8F0D9000 1000
[ 59.410091] change_pte_range 7FAB8F0DA000 1000
[ 59.410412] change_pte_range 7FAB8F0DB000 1000
[ 59.410733] change_pte_range 7FAB8F0DC000 1000
[ 59.411052] change_pte_range 7FAB8F0DD000 1000
[ 59.411386] change_pte_range 7FAB8F0DE000 1000
[ 59.411709] change_pte_range 7FAB8F0DF000 1000
[ 59.412025] change_pte_range 7FAB8F0E0000 1000
[ 59.412334] change_pte_range 7FAB8F0E1000 1000
[ 59.412658] change_pte_range 7FAB8F0E2000 1000
[ 59.412987] change_pte_range 7FAB8F0E3000 1000
[ 59.413313] change_pte_range 7FAB8F0E4000 1000
[ 59.413626] change_pte_range 7FAB8F0E5000 1000
[ 59.413948] change_pte_range 7FAB8F0E6000 1000
[ 59.414264] change_pte_range 7FAB8F0E7000 1000
[ 59.414579] change_pte_range 7FAB8F0E8000 1000
[ 59.414895] change_pte_range 7FAB8F0E9000 1000
[ 59.415242] change_pte_range 7FAB8F0EA000 1000
[ 59.415553] change_pte_range 7FAB8F0EB000 1000
[ 59.415877] change_pte_range 7FAB8F0EC000 1000
[ 59.416195] change_pte_range 7FAB8F0ED000 1000
[ 59.416508] change_pte_range 7FAB8F0EE000 1000
[ 59.416831] change_pte_range 7FAB8F0EF000 1000
[ 59.417140] change_pte_range 7FAB8F0F0000 1000
[ 59.417451] change_pte_range 7FAB8F0F1000 1000
[ 59.417769] change_pte_range 7FAB8F0F2000 1000
[ 59.418083] change_pte_range 7FAB8F0F3000 1000
[ 59.418396] change_pte_range 7FAB8F0F4000 1000
[ 59.418711] change_pte_range 7FAB8F0F5000 1000
[ 59.419028] change_pte_range 7FAB8F0F6000 1000
[ 59.419355] change_pte_range 7FAB8F0F7000 1000
[ 59.419665] change_pte_range 7FAB8F0F8000 1000
[ 59.419982] change_pte_range 7FAB8F0F9000 1000
[ 59.420298] change_pte_range 7FAB8F0FA000 1000
[ 59.420611] change_pte_range 7FAB8F0FB000 1000
[ 59.420934] change_pte_range 7FAB8F0FC000 1000
[ 59.421252] change_pte_range 7FAB8F0FD000 1000
[ 59.421566] change_pte_range 7FAB8F0FE000 1000
[ 59.421890] change_pte_range 7FAB8F0FF000 1000
[ 59.422214] change_pte_range 7FAB8F100000 1000
[ 59.422541] change_pte_range 7FAB8F101000 1000
[ 59.422869] change_pte_range 7FAB8F102000 1000
[ 59.423202] change_pte_range 7FAB8F103000 1000
[ 59.423562] change_pte_range 7FAB8F104000 1000
[ 59.424080] change_pte_range 7FAB8F105000 1000
[ 59.424524] change_pte_range 7FAB8F106000 1000
[ 59.424904] change_pte_range 7FAB8F107000 1000
[ 59.425234] change_pte_range 7FAB8F108000 1000
[ 59.425617] change_pte_range 7FAB8F109000 1000
[ 59.426026] change_pte_range 7FAB8F10A000 1000
[ 59.426430] change_pte_range 7FAB8F10B000 1000
[ 59.426844] change_pte_range 7FAB8F10C000 1000
[ 59.427227] change_pte_range 7FAB8F10D000 1000
[ 59.427633] change_pte_range 7FAB8F10E000 1000
[ 59.428049] change_pte_range 7FAB8F10F000 1000
[ 59.428456] change_pte_range 7FAB8F110000 1000
[ 59.428870] change_pte_range 7FAB8F111000 1000
[ 59.429235] change_pte_range 7FAB8F112000 1000
[ 59.429611] change_pte_range 7FAB8F113000 1000
[ 59.430010] change_pte_range 7FAB8F114000 1000
[ 59.430384] change_pte_range 7FAB8F115000 1000
[ 59.430776] change_pte_range 7FAB8F116000 1000
[ 59.431167] change_pte_range 7FAB8F117000 1000
[ 59.431556] change_pte_range 7FAB8F118000 1000
[ 59.431953] change_pte_range 7FAB8F119000 1000
[ 59.432330] change_pte_range 7FAB8F11A000 1000
[ 59.432704] change_pte_range 7FAB8F11B000 1000
[ 59.433071] change_pte_range 7FAB8F11C000 1000
[ 59.433443] change_pte_range 7FAB8F11D000 1000
[ 59.433826] change_pte_range 7FAB8F11E000 1000
[ 59.434222] change_pte_range 7FAB8F11F000 1000
[ 59.434594] change_pte_range 7FAB8F120000 1000
[ 59.435006] change_pte_range 7FAB8F121000 1000
[ 59.435418] change_pte_range 7FAB8F122000 1000
[ 59.435811] change_pte_range 7FAB8F123000 1000
[ 59.436191] change_pte_range 7FAB8F124000 1000
[ 59.436583] change_pte_range 7FAB8F125000 1000
[ 59.436972] change_pte_range 7FAB8F126000 1000
[ 59.437374] change_pte_range 7FAB8F127000 1000
[ 59.437774] change_pte_range 7FAB8F128000 1000
[ 59.438934] pagemap_scan_pmd_entry 7FAB8ED41000 7FAB8EE00000
[ 59.439443] pagemap_scan_pmd_entry 7FAB8EE00000 7FAB8F000000
[ 59.439955] pagemap_scan_pmd_entry 7FAB8F000000 7FAB8F129000
