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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1782196139; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zGm6TUFBAg84hbkJ477thX3itg6T9dCyxPw+enISTeU=; b=Tpo4KkFrsFNFm6Ly/8tUzfzu0MJJ6VdUwcPMg6lKY4K3FCcVCQReTaeBUYOMlGuTAKMDDz M1+L5k0Xqy6KfAUnecwQHyAUe/pON7OXT1bFKhs2DpLnwhwvez/II0XySwSVinnvIkp90N zyQcQYpZQDPwTZ8l/fGTpE3rEOj5lA0= From: Jiayuan Chen To: linux-mm@kvack.org Cc: yingfu.zhou@shopee.com, jiayuan.chen@linux.dev, Jiayuan Chen , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , Kairui Song , Qi Zheng , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , David Hildenbrand , Lorenzo Stoakes , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] memcg: bail out memory.max when memcg is dying Date: Tue, 23 Jun 2026 14:27:55 +0800 Message-ID: <20260623062800.298514-3-jiayuan.chen@linux.dev> In-Reply-To: <20260623062800.298514-1-jiayuan.chen@linux.dev> References: <20260623062800.298514-1-jiayuan.chen@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Stat-Signature: et9puqrbh6koe9qcaexdaetbrxh49t85 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 74BD9180009 X-HE-Tag: 1782196140-599503 X-HE-Meta: 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 Q8M6DefN WEfZxbolzNQyOFS4oxQDHOHef/x7B1xJUbfi3+ETV5J/hvgcpgbUewM0MBb+BxSnec1vXx5TQvI8nGy926a1NsBw6ed1ZOsD//GCMkeko+We+ALDnoHWoEsfaC5WR2Dtoy+cBZFZl0xOYbty/kKGdjuERkEsEwA0Z1VKzblmC8AGH3PabwqaD5jmNH1V/Q2rbvOX8s1X5nejgMJKjXLNTfuu0LsSVH0W77HoB/hTTbvHdutDxu4iETy19XQ0CIKB/OfCZYUwkl4+w42UXn6CYXyvRiZ8SxaGihaFDi37umep8gAE= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Jiayuan Chen memory.max has the same high-latency reclaim loop as memory.high, and may additionally invoke the OOM killer on a cgroup that is already going away, further delaying its removal. Mitigate this by bailing out of the loop once memcg_is_dying(). Reported-by: Zhou Yingfu Cc: Jiayuan Chen Signed-off-by: Jiayuan Chen --- mm/memcontrol.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 2d5cd056a25e..06bde6c5318f 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4847,6 +4847,9 @@ static ssize_t memory_max_write(struct kernfs_open_file *of, if (signal_pending(current)) break; + if (memcg_is_dying(memcg)) + break; + if (!drained) { drain_all_stock(memcg); drained = true; -- 2.43.0