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Mon, 26 Jun 2023 19:55:30 -0700 (PDT) MIME-Version: 1.0 References: <20230626171430.3167004-1-ryan.roberts@arm.com> <20230626171430.3167004-7-ryan.roberts@arm.com> In-Reply-To: <20230626171430.3167004-7-ryan.roberts@arm.com> From: Yu Zhao Date: Mon, 26 Jun 2023 20:54:54 -0600 Message-ID: Subject: Re: [PATCH v1 06/10] mm: Allow deferred splitting of arbitrary large anon folios To: Ryan Roberts Cc: Andrew Morton , "Matthew Wilcox (Oracle)" , "Kirill A. Shutemov" , Yin Fengwei , David Hildenbrand , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-s390@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 7480E4000D X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 4qj4jno3sfjguoows5kcrt98y3ohcse8 X-HE-Tag: 1687834531-162281 X-HE-Meta: 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 a+Q4epff EPbgb3OLUlqg30xNF4328SuuAT4QqwgJVg40F2Q9GOBdv2GnIYj1FEyMfmpDmZaI5pQjn5lDljLa3CvXkc895nXEvKOXWkhKX9nXLubfyiUQRWnE0/jjczN7vmlTFYaQGeAVeL2bCsgN/908PNvzT4VCCkNZPam9L1a1EmflaOcQzFLIh89aTMyLDzE5BKRhYHw2Kfw31KzkdPfTWztel33bji1+vCEhCTTSWvboHDnOgT2XU8PSeqRW/HE1q7Y+uhXE86vCmWedmSX6VzDRvKClj2eQA0FlvA35WOJB996ovjlS6hgMG+PhQWQ== 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 Mon, Jun 26, 2023 at 11:15=E2=80=AFAM Ryan Roberts wrote: > > With the introduction of large folios for anonymous memory, we would > like to be able to split them when they have unmapped subpages, in order > to free those unused pages under memory pressure. So remove the > artificial requirement that the large folio needed to be at least > PMD-sized. > > Signed-off-by: Ryan Roberts Reviewed-by: Yu Zhao