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AJvYcCVD7zHd6+jTS7D8Q8+CAQHGmxVNcDsjcD7vILEho7A2bWF0ZP26+7NAsMlSvrAimKNosMgsoIi5SqwL54mAEG/VlaA= X-Gm-Message-State: AOJu0Yz8xj+Y2hOeixcOOWz1juijISDB5x+sSWi23CNLQdcFSoGqI/kT HGbPXwWb/7kesdlf+y5SiUCh5K4pZsLrQ7edXIhJTsj3gfdUQbIYz/kwgRoDB3kkuVxk1IwHF// u3HstnOp6kIwfgAHHjh7qSfG6kEQ= X-Google-Smtp-Source: AGHT+IFXVsLrhPZO5tS9LCr9oB9cFWgS+R/IjCpkOQo8nDWWvktiqIrrVwRrfjEHrh9e9esBRUT9X8Q6srbqEPadh5E= X-Received: by 2002:a05:6402:5113:b0:571:fc6b:966c with SMTP id m19-20020a056402511300b00571fc6b966cmr1325418edd.13.1714581446151; Wed, 01 May 2024 09:37:26 -0700 (PDT) MIME-Version: 1.0 References: <20240401191614.00007c83@Huawei.com> <9b3c2d48-96f2-4d29-b2ba-a0f2ea47da45@redhat.com> In-Reply-To: From: Yang Shi Date: Wed, 1 May 2024 09:37:14 -0700 Message-ID: Subject: Re: [LSF/MM/BPF TOPIC] Multi-sized THP performance benchmarks and analysis on ARM64 To: Michal Hocko Cc: David Hildenbrand , "Christoph Lameter (Ampere)" , Jonathan Cameron , lsf-pc@lists.linux-foundation.org, olivier.singla@amperecomputing.com, Linux MM , Dan Williams Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 037AD14000C X-Stat-Signature: fn7rpk3do8fjjz3yey3zbfids7tp4t3k X-Rspam-User: X-HE-Tag: 1714581449-17472 X-HE-Meta: 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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, Apr 30, 2024 at 7:41=E2=80=AFAM Michal Hocko wrot= e: > > On Thu 04-04-24 21:33:57, David Hildenbrand wrote: > > On 04.04.24 20:57, Christoph Lameter (Ampere) wrote: > > > On Mon, 1 Apr 2024, Jonathan Cameron wrote: > > > > > > > Sounds like useful data, but is it a suitable topic for LSF-MM? > > > > What open questions etc is it raising? > > > > > > > > > mTHP is new functionality that will require additional work to suppor= t > > > more use cases. It is also unclear at this point in what usecases mTH= P is > > > useful and where no benefit can so far be seen. Also the effect of > > > coalescing multiple PTE entries into one TLB entry is new to MM > > > (CONT_PTE). > > > > > > Ultimately it would be useful to have mTHP support also provide large= r > > > blocksize capabilities for filesystem etc etc. mTHP needs to mature a= nd an > > > analysis of the arguable a bit experimental state of affairs can help= a > > > lot in getting there. > > > > Right, something like that (open items, missed use cases, requirements, > > ideas, etc,.) would be a better (good!) fit. > > > > Pure benchmark results, analysis and recommendations are great. But lik= ely a > > better fit for a (white) paper, blog post, less-discussion-focused > > conference. > > Completely agreed! It would be really great if Yang Shi could open the > topic with high level data and then we spent majority of the slot on the > actual discussion. I will try my best to minimize the time spent by explaining benchmark data. It may take 10 - 15 minutes in ballpark estimation. Then the remaining time can be spent in actual discussion. > > Thanks! > -- > Michal Hocko > SUSE Labs