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From: Roman Gushchin To: Shakeel Butt Cc: Andrew Morton , Johannes Weiner , Michal Hocko , Muchun Song , Hugh Dickins , Yosry Ahmed , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, Meta kernel team Subject: Re: [PATCH v1 3/6] memcg-v1: no need for memcg locking for dirty tracking Message-ID: References: <20241025012304.2473312-1-shakeel.butt@linux.dev> <20241025012304.2473312-4-shakeel.butt@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241025012304.2473312-4-shakeel.butt@linux.dev> X-Migadu-Flow: FLOW_OUT X-Stat-Signature: e9cufcg6dsa3zy1je7z6d16ycgdicicx X-Rspamd-Queue-Id: 47CC514001A X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1729877996-823499 X-HE-Meta: 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 ZrNQD/pD 14HOwmo7Vnnq4jqeFN1++0xog2slZHs4zvf3tEmuqIo0IOXn8gs6jkVQuqxouZbzohZTnlmGI3BKHmxP0xIhFriaIOXaPyF9/nbASOX3jnr4ZAhGrn8hB3zu/6LZ6rlbBA4N4mboN5v528qA= 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 Thu, Oct 24, 2024 at 06:23:00PM -0700, Shakeel Butt wrote: > During the era of memcg charge migration, the kernel has to be make sure > that the dirty stat updates do not race with the charge migration. > Otherwise it might update the dirty stats of the wrong memcg. Now with > the memcg charge migration deprecated, there is no more race for dirty > stat updates and the previous locking can be removed. > > Signed-off-by: Shakeel Butt Reviewed-by: Roman Gushchin