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Shutemov" To: Andrew Morton Cc: "Huang, Ying" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Zi Yan , Andrea Arcangeli , "Kirill A . Shutemov" , Vlastimil Babka , Alexey Dobriyan , Michal Hocko , Konstantin Khlebnikov , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Yang Shi Subject: Re: [PATCH -V2] /proc/PID/smaps: Add PMD migration entry parsing Message-ID: <20200402125301.mtngw2toytiohkee@box> References: <20200402020031.1611223-1-ying.huang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200402020031.1611223-1-ying.huang@intel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Apr 02, 2020 at 10:00:31AM +0800, Huang, Ying wrote: > From: Huang Ying > > 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@oriontransfer.co.nz -- Kirill A. Shutemov