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Wed, 15 May 2024 06:50:28 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Yang Shi Date: Wed, 15 May 2024 07:50:17 -0600 Message-ID: Subject: Re: [Lsf-pc] [LSF/MM/BPF TOPIC]mTHP reliable allocation and reclamation To: Barry Song <21cnbao@gmail.com> Cc: Yu Zhao , Michal Hocko , Matthew Wilcox , Linux-MM , lsf-pc@lists.linux-foundation.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 1C4604000B X-Stat-Signature: omzjq6mhaekzs639x1rtyychzme688y7 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1715781029-381515 X-HE-Meta: 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 f8B/3XHm 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 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: List-Subscribe: List-Unsubscribe: On Tue, May 14, 2024 at 8:45=E2=80=AFPM Barry Song <21cnbao@gmail.com> wrot= e: > > On Sat, May 11, 2024 at 8:33=E2=80=AFAM Yu Zhao wrote= : > > > > On Fri, May 10, 2024 at 8:25=E2=80=AFAM Michal Hocko = wrote: > > > > > > On Fri 10-05-24 14:42:07, Barry Song wrote: > > > [...] > > > > I'm completely open to discussing both topics in the same TAO sessi= on. > > > > Having a separate session isn't important to me at all. > > > > > > If we happen to still have some topics uncovered we can schedule a > > > follow up slot. > > > > Thanks, Michal. > > > > Barry, you are very welcome to present your alternative approach in > > the same session. > > > > In fact, it seems that we both independently explored this > > pageblock-based approach. I did share our design with a few folks and > > explained why we put it on the back burner and have been focusing on > > the zone-based approach since then. > > > > Let me attach the deck that outlines our design, hopefully, we'll have > > enough time to cover some of its ideas if there is enough interest. > > Thank you. I'm also attaching our findings regarding mTHP allocation & > reclamation fallback, along with our approach and observations on running > TAO on Pixel 6. > > From deploying mTHP on numerous phones, I've learned that I'm not keen > on using dedicated page blocks for mTHP. Instead, I prefer the virtual zo= ne > approach due to the folio size conflict in a single LRU. Further details = are > available in the attached PDF. I'd like to know what page sizes were enabled for your test? A single page size, for example, 64K, or all possible page sizes? > > Best regards > Barry