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Tue, 10 Feb 2026 13:43:21 +0800 From: "zhaoyang.huang" To: Andrew Morton , Yu Zhao , Michal Hocko , Rik van Riel , Shakeel Butt , Roman Gushchin , Johannes Weiner , , , Zhaoyang Huang , Subject: [RESEND PATCH] mm: bail out from partial cgroup_reclaim inside shrink_lruvec Date: Tue, 10 Feb 2026 13:43:12 +0800 Message-ID: <20260210054312.303129-1-zhaoyang.huang@unisoc.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.0.73.40] X-ClientProxiedBy: SHCAS01.spreadtrum.com (10.0.1.201) To BJMBX01.spreadtrum.com (10.0.64.7) X-MAIL:SHSQR01.spreadtrum.com 61A5hPoq016481 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=unisoc.com; s=default; t=1770702222; bh=WXTUlQnumUaygJxbhSnJT0+rlcSCmcEIeUJIsJDTIrY=; h=From:To:Subject:Date; b=gfO9m+pcK41g/rbteCxRu298IfMnjgD2qoWYvn76QpjoQr0DWWjiQxTRJzVVYJNhG rg4oVKnOM5kfubvvEsgMc9NVhOCU3U2biDEf84+wR0s/98ccA3YK+ONx2b1kCng58K UzkR+Q5cr+ZI3gHPiyyC03Ss1fBNEJ//k7Q9YemcV/rK++cv9V2ul8zfdK6reOC6wb 5GlUrIjPFqK1KhCQRXYOrWiryDVe+fXf+1IX5p3bTgptzvKzylo1PfhSWdU9nAC2gL wYb4CFu/PhVU17ooRWLLJydKp+JnkQFW5V02tBaLstYmcleWGLANj2nPTWz3lPtS/P C8Lcjx/09znvQ== X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: D66E820007 X-Stat-Signature: u4kt7qqitq7tktuhz1ycphxw9adazby7 X-Rspam-User: X-HE-Tag: 1770702427-536268 X-HE-Meta: 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 imE1LzHw mB/MMhfbPYagFFruOFcsZRkI+72XF4Hc0fSHzXlzUj9DhRq4= 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: From: Zhaoyang Huang Nowadays, ANDROID system replaces madivse with memory.reclaim to implement user space memory management which desires to reclaim a certain amount of memcg's memory. However, oversized reclaiming and high latency are observed as there is no limitation over nr_reclaimed inside try_to_shrink_lruvec when MGLRU enabled. Besides, this could also affect all none root_reclaim such as reclaim_high etc. The commit 'b82b530740b9' ("mm: vmscan: restore incremental cgroup iteration") introduces sc->memcg_full_walk to limit the walk range of mem_cgroup_iter. This commit would like to make single memcg's scanning more precised by judging if nr_reclaimed reached when sc->memcg_full_walk not set. Signed-off-by: Zhaoyang Huang --- mm/vmscan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 670fe9fae5ba..03bda1094621 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4832,8 +4832,8 @@ static bool should_abort_scan(struct lruvec *lruvec, struct scan_control *sc) int i; enum zone_watermarks mark; - /* don't abort memcg reclaim to ensure fairness */ - if (!root_reclaim(sc)) + /* don't abort full walk memcg reclaim to ensure fairness */ + if (!root_reclaim(sc) && sc->memcg_full_walk) return false; if (sc->nr_reclaimed >= max(sc->nr_to_reclaim, compact_gap(sc->order))) -- 2.25.1