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From: Shakeel Butt To: Richard Chang Cc: Andrew Morton , Kairui Song , Qi Zheng , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Johannes Weiner , David Hildenbrand , Michal Hocko , Lorenzo Stoakes , Suren Baghdasaryan , "T . J . Mercier" , Martin Liu , Minchan Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: vmscan: abort proactive reclaim early when freezing Message-ID: References: <20260706081218.3438762-1-richardycc@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260706081218.3438762-1-richardycc@google.com> X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 7E748C000A X-Stat-Signature: ohc1y3wahwz4115yncf4ti6zkb668izz X-HE-Tag: 1783453706-82857 X-HE-Meta: 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 S8JYTJWW Tb7P3JUQAjwMPLXUj5OtoJe4W6jNZdYTNZ9P/dchSZp1FwAHSomS8mJ8I40WneDbUJrrBWaEriJoatv0vYJBtls0BQ/JslScmgR+P+Ks1z8J47qPdd8BFie1G96+k+djifYwy4seDyzIh1VY9IDPySCHiePCK/gDqMyIszwibtGYJqp22aVUL/zytdvohQQa23JEFY+4HoInMsxs5XD7i+YjEgNecjNdln1djF2Z3rGlbhW0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jul 06, 2026 at 08:12:18AM +0000, Richard Chang wrote: > Proactive reclaim (via memory.reclaim or node reclaim) checks for pending > signals in its outer loop in user_proactive_reclaim(). However, the inner > reclaim loops—scanning cgroups in shrink_many() and evicting folios in > try_to_shrink_lruvec() can run for a long time before returning to the > outer loop, especially on systems with many cgroups or large memory sizes. > > This latency in responding to signals can block the freezer (both cgroup > freezer and system suspend), leading to freezer timeouts. This issue was > specifically observed on Android when attempting to freeze background > cgroups while proactive reclaim was active. > Can you please explain how freezing operation was delayed due to proactive reclaim?