Re: [PATCH RESEND v15 2/5] fs/proc/task_mmu: Implement IOCTL to get and optionally clear info about PTEs

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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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[   59.204398] change_pte_range 7FAB8EE61000 1000
[   59.204724] change_pte_range 7FAB8EE62000 1000
[   59.205043] change_pte_range 7FAB8EE63000 1000
[   59.205358] change_pte_range 7FAB8EE64000 1000
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[   59.206000] change_pte_range 7FAB8EE66000 1000
[   59.206369] change_pte_range 7FAB8EE67000 1000
[   59.206737] change_pte_range 7FAB8EE68000 1000
[   59.207050] change_pte_range 7FAB8EE69000 1000
[   59.207432] change_pte_range 7FAB8EE6A000 1000
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[   59.208599] change_pte_range 7FAB8EE6D000 1000
[   59.208946] change_pte_range 7FAB8EE6E000 1000
[   59.209267] change_pte_range 7FAB8EE6F000 1000
[   59.209588] change_pte_range 7FAB8EE70000 1000
[   59.209910] change_pte_range 7FAB8EE71000 1000
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[   59.210529] change_pte_range 7FAB8EE73000 1000
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[   59.211494] change_pte_range 7FAB8EE76000 1000
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[   59.212120] change_pte_range 7FAB8EE78000 1000
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[   59.213365] change_pte_range 7FAB8EE7C000 1000
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[   59.214300] change_pte_range 7FAB8EE7F000 1000
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[   59.219686] change_pte_range 7FAB8EE90000 1000
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[   59.225160] change_pte_range 7FAB8EEA1000 1000
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[   59.225793] change_pte_range 7FAB8EEA3000 1000
[   59.226115] change_pte_range 7FAB8EEA4000 1000
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[   59.227403] change_pte_range 7FAB8EEA8000 1000
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[   59.230555] change_pte_range 7FAB8EEB2000 1000
[   59.230876] change_pte_range 7FAB8EEB3000 1000
[   59.231199] change_pte_range 7FAB8EEB4000 1000
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[   59.232456] change_pte_range 7FAB8EEB8000 1000
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[   59.235354] change_pte_range 7FAB8EEC1000 1000
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[   59.240279] change_pte_range 7FAB8EED0000 1000
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[   59.262214] change_pte_range 7FAB8EF10000 1000
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[   59.309536] change_pte_range 7FAB8EFA0000 1000
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[   59.310512] change_pte_range 7FAB8EFA3000 1000
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[   59.311173] change_pte_range 7FAB8EFA5000 1000
[   59.311496] change_pte_range 7FAB8EFA6000 1000
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[   59.312151] change_pte_range 7FAB8EFA8000 1000
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[   59.314758] change_pte_range 7FAB8EFB0000 1000
[   59.315087] change_pte_range 7FAB8EFB1000 1000
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[   59.315739] change_pte_range 7FAB8EFB3000 1000
[   59.316064] change_pte_range 7FAB8EFB4000 1000
[   59.316384] change_pte_range 7FAB8EFB5000 1000
[   59.316696] change_pte_range 7FAB8EFB6000 1000
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[   59.319217] change_pte_range 7FAB8EFBE000 1000
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[   59.319851] change_pte_range 7FAB8EFC0000 1000
[   59.320161] change_pte_range 7FAB8EFC1000 1000
[   59.320480] change_pte_range 7FAB8EFC2000 1000
[   59.320796] change_pte_range 7FAB8EFC3000 1000
[   59.321109] change_pte_range 7FAB8EFC4000 1000
[   59.321418] change_pte_range 7FAB8EFC5000 1000
[   59.321743] change_pte_range 7FAB8EFC6000 1000
[   59.322055] change_pte_range 7FAB8EFC7000 1000
[   59.322367] change_pte_range 7FAB8EFC8000 1000
[   59.322683] change_pte_range 7FAB8EFC9000 1000
[   59.323049] change_pte_range 7FAB8EFCA000 1000
[   59.323384] change_pte_range 7FAB8EFCB000 1000
[   59.323753] change_pte_range 7FAB8EFCC000 1000
[   59.324072] change_pte_range 7FAB8EFCD000 1000
[   59.324389] change_pte_range 7FAB8EFCE000 1000
[   59.324711] change_pte_range 7FAB8EFCF000 1000
[   59.325027] change_pte_range 7FAB8EFD0000 1000
[   59.325341] change_pte_range 7FAB8EFD1000 1000
[   59.325656] change_pte_range 7FAB8EFD2000 1000
[   59.325985] change_pte_range 7FAB8EFD3000 1000
[   59.326297] change_pte_range 7FAB8EFD4000 1000
[   59.326618] change_pte_range 7FAB8EFD5000 1000
[   59.326938] change_pte_range 7FAB8EFD6000 1000
[   59.327256] change_pte_range 7FAB8EFD7000 1000
[   59.327567] change_pte_range 7FAB8EFD8000 1000
[   59.327886] change_pte_range 7FAB8EFD9000 1000
[   59.328196] change_pte_range 7FAB8EFDA000 1000
[   59.328512] change_pte_range 7FAB8EFDB000 1000
[   59.328831] change_pte_range 7FAB8EFDC000 1000
[   59.329145] change_pte_range 7FAB8EFDD000 1000
[   59.329457] change_pte_range 7FAB8EFDE000 1000
[   59.329776] change_pte_range 7FAB8EFDF000 1000
[   59.330083] change_pte_range 7FAB8EFE0000 1000
[   59.330400] change_pte_range 7FAB8EFE1000 1000
[   59.330720] change_pte_range 7FAB8EFE2000 1000
[   59.331032] change_pte_range 7FAB8EFE3000 1000
[   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
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[   59.333250] change_pte_range 7FAB8EFEA000 1000
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[   59.333891] change_pte_range 7FAB8EFEC000 1000
[   59.334206] change_pte_range 7FAB8EFED000 1000
[   59.334522] change_pte_range 7FAB8EFEE000 1000
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[   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
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[   59.339278] change_pte_range 7FAB8EFFD000 1000
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[   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
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[   59.341557] change_pte_range 7FAB8F004000 1000
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[   59.342191] change_pte_range 7FAB8F006000 1000
[   59.342507] change_pte_range 7FAB8F007000 1000
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[   59.344102] change_pte_range 7FAB8F00C000 1000
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[   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
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[   59.347295] change_pte_range 7FAB8F016000 1000
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[   59.350562] change_pte_range 7FAB8F020000 1000
[   59.350888] change_pte_range 7FAB8F021000 1000
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[   59.355704] change_pte_range 7FAB8F030000 1000
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[   59.370959] change_pte_range 7FAB8F060000 1000
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[   59.381515] change_pte_range 7FAB8F081000 1000
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[   59.382146] change_pte_range 7FAB8F083000 1000
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[   59.393159] change_pte_range 7FAB8F0A5000 1000
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[   59.403993] change_pte_range 7FAB8F0C7000 1000
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[   59.408170] change_pte_range 7FAB8F0D4000 1000
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[   59.408812] change_pte_range 7FAB8F0D6000 1000
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[   59.410091] change_pte_range 7FAB8F0DA000 1000
[   59.410412] change_pte_range 7FAB8F0DB000 1000
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[   59.412025] change_pte_range 7FAB8F0E0000 1000
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[   59.413313] change_pte_range 7FAB8F0E4000 1000
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[   59.414579] change_pte_range 7FAB8F0E8000 1000
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[   59.415242] change_pte_range 7FAB8F0EA000 1000
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[   59.416195] change_pte_range 7FAB8F0ED000 1000
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[   59.417140] change_pte_range 7FAB8F0F0000 1000
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[   59.418083] change_pte_range 7FAB8F0F3000 1000
[   59.418396] change_pte_range 7FAB8F0F4000 1000
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[   59.419355] change_pte_range 7FAB8F0F7000 1000
[   59.419665] change_pte_range 7FAB8F0F8000 1000
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[   59.420298] change_pte_range 7FAB8F0FA000 1000
[   59.420611] change_pte_range 7FAB8F0FB000 1000
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[   59.422214] change_pte_range 7FAB8F100000 1000
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[   59.428456] change_pte_range 7FAB8F110000 1000
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[   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

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