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b=oruM4hTcXifAYrBU7Zr+gWGR2kYzQ3H3DYeRPfO+p3EJvtjhhfiO7nkywQxMgB/bE Ec9ZjWbZK9B5mBOxRvtrij4608SEswjLURkzt2FxIcClBU+xVQo1cIyvznzDKssxan zT6Or8B/F+NEvJf7alPOEpZ6QxpiZpOWwGsA8Uwo= Date: Sat, 28 Feb 2026 10:58:29 -0800 From: Andrew Morton To: Leno Hou Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Axel Rasmussen , Yuanchu Xie , Wei Xu , Barry Song <21cnbao@gmail.com>, Jialing Wang , Yafang Shao , Yu Zhao Subject: Re: [PATCH] mm/mglru: fix cgroup OOM during MGLRU state switching Message-Id: <20260228105829.984f06aeaf701487036ac992@linux-foundation.org> In-Reply-To: <20260228161008.707-1-lenohou@gmail.com> References: <20260228161008.707-1-lenohou@gmail.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 19882100002 X-Stat-Signature: 9x5wt8tkhwjjb3y5ap18po71xhh663io X-Rspam-User: X-HE-Tag: 1772305110-590190 X-HE-Meta: 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 BBd2fPPs 285lbdRc5wmErDIJnJnXaMU7Qrid4vbs5wiv43PwML2nZKf4aIvuuspoXAOG3nr4l/4HurDJUtA23RBp2QjcTvuVegpYpwdW9UxVSS9qb2D4xhhRhgm+DTQklx2RrFf8eG2VyLugCZcqRqUW1yYYbiMnJPedtdQRX+5nojHIj6g3Mmii2C1jebtOR48DtLvHfkh8FVgjFkCjbyFkY8YbvTqUfqvD8fD5iR7jlqg9LrBCTAgtiSWsyCD02aZBnGQsOF8oyh3z5UXZ3LvEh7Warnv6yrY5bXZfkaqWezyBd7p7g1fr6vjy4g4snHVdpmOulz5+SuB6m+6qBFJqQ2tSPXhVmfgb+gTmm0Gz3LWKdOmGNur0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, 1 Mar 2026 00:10:08 +0800 Leno Hou wrote: > When the Multi-Gen LRU (MGLRU) state is toggled dynamically, a race > condition exists between the state switching and the memory reclaim > path. This can lead to unexpected cgroup OOM kills, even when plenty of > reclaimable memory is available. > > ... > Nice description, thanks. I'll queue this for testing while we await comments. > > Reproduction script: > --- Please avoid using the ^---$ separator in changelogs - it means "end of changelog text"! > Signed-off-by: Leno Hou > > --- Ditto.