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Shutemov" To: Zi Yan Cc: linux-mm@kvack.org, Roman Gushchin , Rik van Riel , "Kirill A . Shutemov" , Matthew Wilcox , Shakeel Butt , Yang Shi , David Nellans , linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 01/16] mm: add pagechain container for storing multiple pages. Message-ID: <20200907122228.4zlyfysdul3s62me@box> References: <20200902180628.4052244-1-zi.yan@sent.com> <20200902180628.4052244-2-zi.yan@sent.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200902180628.4052244-2-zi.yan@sent.com> X-Rspamd-Queue-Id: 9658E1AD1AD X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000219, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Sep 02, 2020 at 02:06:13PM -0400, Zi Yan wrote: > From: Zi Yan > > When depositing page table pages for 1GB THPs, we need 512 PTE pages + > 1 PMD page. Instead of counting and depositing 513 pages, we can use the > PMD page as a leader page and chain the rest 512 PTE pages with ->lru. > This, however, prevents us depositing PMD pages with ->lru, which is > currently used by depositing PTE pages for 2MB THPs. So add a new > pagechain container for PMD pages. > > Signed-off-by: Zi Yan Just deposit it to a linked list in the mm_struct as we do for PMD if split ptl disabled. -- Kirill A. Shutemov