Re: [PATCH -V2] /proc/PID/smaps: Add PMD migration entry parsing

[Kirill A. Shutemov]

On Thu, Apr 02, 2020 at 10:00:31AM +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@xxxxxxxxx>
> 
> Now, when read /proc/PID/smaps, the PMD migration entry in page table is simply
> ignored.  To improve the accuracy of /proc/PID/smaps, its parsing and processing
> is added.
> 
> Before the patch, for a fully populated 400 MB anonymous VMA, sometimes some THP
> pages under migration may be lost as follows.
> 
> 7f3f6a7e5000-7f3f837e5000 rw-p 00000000 00:00 0
> Size:             409600 kB
> KernelPageSize:        4 kB
> MMUPageSize:           4 kB
> Rss:              407552 kB
> Pss:              407552 kB
> Shared_Clean:          0 kB
> Shared_Dirty:          0 kB
> Private_Clean:         0 kB
> Private_Dirty:    407552 kB
> Referenced:       301056 kB
> Anonymous:        407552 kB
> LazyFree:              0 kB
> AnonHugePages:    405504 kB
> ShmemPmdMapped:        0 kB
> FilePmdMapped:        0 kB

The alignment makes me triggered.

Andrew, could you please apply this patch:

http://lore.kernel.org/r/20191230084125.267040-1-samuel.williams@xxxxxxxxxxxxxxxxxxx

-- 
 Kirill A. Shutemov