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AJvYcCXM3njfh1aWQfHEWuxkKZma94cKfNAAvf1mkK7n/SNBDvVNOc8n7OKPhBQEXIET9iuDNcqHjklq5lqGfJztfF5DFok= X-Gm-Message-State: AOJu0Yy9yGfwmxtf41MFutzl9ZE3rEle8Q/xlwqsBj7rSN0+mUlz2QXk /gvqj3Nv8NwB2uHKUx2CZ+YkrXhCw9blasbhqQjCKo+u2IlrHpQ/CYK2J5bgFcvgZ7cvjYAzDd9 3/tY5M1M6WpIS5ns+4RSvd6Y0411lLglM X-Google-Smtp-Source: AGHT+IG0VFG34dW6TntSYGpVhzlZoKnQog7LGdjEUr2rXNIVqshKQ72zGCPy+dOq0y/6WL0TqlFup1SG7llo9wwJPFs= X-Received: by 2002:a05:6402:1910:b0:57d:619:7721 with SMTP id 4fb4d7f45d1cf-5879f982feemr833762a12.21.1719671415676; Sat, 29 Jun 2024 07:30:15 -0700 (PDT) MIME-Version: 1.0 References: <20240628130750.73097-1-ioworker0@gmail.com> <20240628130750.73097-3-ioworker0@gmail.com> In-Reply-To: From: Lance Yang Date: Sat, 29 Jun 2024 22:30:04 +0800 Message-ID: Subject: Re: [PATCH v2 2/2] mm: add docs for per-order mTHP split counters To: Barry Song <21cnbao@gmail.com> Cc: akpm@linux-foundation.org, dj456119@gmail.com, ryan.roberts@arm.com, david@redhat.com, shy828301@gmail.com, ziy@nvidia.com, libang.li@antgroup.com, baolin.wang@linux.alibaba.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mingzhe Yang Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 820BFA001B X-Stat-Signature: f1fugwpc8jtpea3nqtcqug9ndhf75c1p X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1719671417-547575 X-HE-Meta: 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 iEQWjbMC HvKS+qNU+nbg7t3h0rrVeigvF8hsqcvoFjIhEzmgraiX6ut5SbZu5kKFsZ2vd//d+hjdErrOQLmooMyinqjJxXqZPgQC+RfEbOAFJUZ2Ipr3dvvq0DXlNNK891Ba1spgUTwHM5V/+/Ij+IZwLxNK65lAVcIIWVlURKcPQeib90bC1ybu5wosj5WI0j+6tsQlTePmd5brJVahxuibB9hp+ZqXYfQsBaUOOgirNNq8YjFbfwbooux7jnZJRbUL3kFWP08OLW39RI5G4LQoqe2r/nGTHQGO2OdvtGsJ04At0e16ccEBd3NV1YUWxbksR8TIJCEupjeLr6rl+KxMhrfcI8trZAhDqMm4BLLc9dBD4d5/2RUDPZ/+pPGBcPx5kB8ud5cdkLDme7nRWPBlKzFeD5YrDLA== 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: Hi Barry, Thanks a lot for taking time to review! On Sat, Jun 29, 2024 at 11:08=E2=80=AFAM Barry Song <21cnbao@gmail.com> wro= te: > > On Sat, Jun 29, 2024 at 1:09=E2=80=AFAM Lance Yang = wrote: > > > > This commit introduces documentation for mTHP split counters in > > transhuge.rst. > > > > Signed-off-by: Mingzhe Yang > > Signed-off-by: Lance Yang > > Reviewed-by: Barry Song Have a nice weekend ;) Lance > > > --- > > Documentation/admin-guide/mm/transhuge.rst | 16 ++++++++++++++++ > > 1 file changed, 16 insertions(+) > > > > diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation= /admin-guide/mm/transhuge.rst > > index 1f72b00af5d3..709fe10b60f4 100644 > > --- a/Documentation/admin-guide/mm/transhuge.rst > > +++ b/Documentation/admin-guide/mm/transhuge.rst > > @@ -514,6 +514,22 @@ file_fallback_charge > > falls back to using small pages even though the allocation was > > successful. > > > > +split > > + is incremented every time a huge page is successfully split int= o > > + base pages. This can happen for a variety of reasons but a comm= on > > + reason is that a huge page is old and is being reclaimed. > > + This action implies splitting any block mappings into PTEs. > > + > > +split_failed > > + is incremented if kernel fails to split huge > > + page. This can happen if the page was pinned by somebody. > > + > > +split_deferred > > + is incremented when a huge page is put onto split > > + queue. This happens when a huge page is partially unmapped and > > + splitting it would free up some memory. Pages on split queue ar= e > > + going to be split under memory pressure. > > + > > As the system ages, allocating huge pages may be expensive as the > > system uses memory compaction to copy data around memory to free a > > huge page for use. There are some counters in ``/proc/vmstat`` to help > > -- > > 2.45.2 > >