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From: Shakeel Butt To: Qi Zheng Cc: hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com, roman.gushchin@linux.dev, muchun.song@linux.dev, david@kernel.org, lorenzo.stoakes@oracle.com, ziy@nvidia.com, harry.yoo@oracle.com, yosry.ahmed@linux.dev, imran.f.khan@oracle.com, kamalesh.babulal@oracle.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, chenridong@huaweicloud.com, mkoutny@suse.com, akpm@linux-foundation.org, hamzamahfooz@linux.microsoft.com, apais@linux.microsoft.com, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Muchun Song , Qi Zheng Subject: Re: [PATCH v3 19/30] mm: workingset: prevent lruvec release in workingset_refault() Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Stat-Signature: s1kx7phynxkd83a1149szz1cy196h5rr X-Rspamd-Queue-Id: 2677A14000C X-Rspamd-Server: rspam04 X-HE-Tag: 1768690965-901048 X-HE-Meta: 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 kZCqzdKW gg54MoCHmr1NN1pynC0V4L+eeee8a4isWtAlXU5ldUNh1czdZIxm7+vl+lN5woWcIGqetIdiKnM/HVGyvKT+C/E/sKhoEy4QVouZJilo1LAdrWF4xT9cYK1U4rbP1RCziOFrwjXC8bdnwbHRoDcBIk4aRnSDxuHhMKmg7JuoszNnxH9EjfhpYXdCNkeDZSqxpsVQtVYDImzq+5hrVjqWoob+VkYE57l9kzzTFqzcd3iGaSWnJySHDQVIcaPvarDjToJwEaVsLFYux+UIN9QjCUORM2skfFp5GTBCJIAY7DFXj6X8= 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 Wed, Jan 14, 2026 at 07:32:46PM +0800, Qi Zheng wrote: > From: Muchun Song > > In the near future, a folio will no longer pin its corresponding > memory cgroup. So an lruvec returned by folio_lruvec() could be > released without the rcu read lock or a reference to its memory > cgroup. > > In the current patch, the rcu read lock is employed to safeguard > against the release of the lruvec in workingset_refault(). > > This serves as a preparatory measure for the reparenting of the > LRU pages. > > Signed-off-by: Muchun Song > Signed-off-by: Qi Zheng > Reviewed-by: Harry Yoo Acked-by: Shakeel Butt