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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1782782989; 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=v+SjXDyaIUskmylTeULQ7YpsBG7g1B+2e1JWTTH/oMw=; b=LJ8Tyy/NprEhJ1xWl5tZRepKEJ7Bf0iHIWyvd/DvQB/j8JXueF6A951huLjm2u2D+cVJRC q+dns6nOTW2bNzOJnTxthMxSXn4oLUUr7N1+ZD/bPOdGaufs0lY8JnEs6PwF54z8GiuLxQ J1zBx6IR2GIfBmmIcQp4B6FfUlWqpDE= From: Jiayuan Chen To: linux-mm@kvack.org Cc: jiayuan.chen@shopee.com, yingfu.zhou@shopee.com, Jiayuan Chen , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , David Hildenbrand , Qi Zheng , Lorenzo Stoakes , Kairui Song , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/4] memcg: bail out proactive reclaim when memcg is dying Date: Tue, 30 Jun 2026 09:29:03 +0800 Message-ID: <20260630012909.144372-4-jiayuan.chen@linux.dev> In-Reply-To: <20260630012909.144372-1-jiayuan.chen@linux.dev> References: <20260630012909.144372-1-jiayuan.chen@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Stat-Signature: pbi7agokercize3rkfxuubgpuiesyy57 X-Rspamd-Queue-Id: DA83940003 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1782782990-31547 X-HE-Meta: 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 ZcILRPh7 Xv6Gtfmxn+3oay/MsrDbkhhTioNvOplmfT6aer66I7Wo8m1SX9nk9I6TSIS0Ie8YjO4QTH+3WeaREdRHMz2krtXRu9jDJgszE4SCVnm0oohX5iMLPpjXwFAkWJgpJy3M1fTqtdtcdcHB9xqkt1uPuUp6Y45P+AD5YIRAvQw7tIMWaUbSFZ4hLJ/cJWtnekk8QOdun9Sc9lEkMIjr2fyGp2RCFnPq08iZ/JGSH02j6vGGA3RunC6lHNBP8+2dnsBpBv8hjdVjTy36XcpsqByhgULVVvbytTmbbbT/xyJ0cc4Uf5/WifeLdaVmMgMBv6VTtbVrf3p5wZoghRrm7nQCCRLiQUn531C9uQN7x Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Jiayuan Chen Proactive reclaim via memory.reclaim can run for a long time - swap I/O or thrashing again dominating the latency - and delays cgroup removal in the same way. Mitigate this by stopping the reclaim once memcg_is_dying(). Reported-by: Zhou Yingfu Cc: Jiayuan Chen Signed-off-by: Jiayuan Chen --- mm/vmscan.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 754c5f5d716a..091b609cf1b1 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -7912,6 +7912,9 @@ int user_proactive_reclaim(char *buf, if (signal_pending(current)) return -EINTR; + if (memcg && memcg_is_dying(memcg)) + return -EAGAIN; + /* * This is the final attempt, drain percpu lru caches in the * hope of introducing more evictable pages. -- 2.43.0