From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794342092; b=AyvWAMBBVrdE2RQ2QgU79P52AexhEOTNbaCfQ1RmkD0knXo5F+vF0eydIZC71VDvzFug 74K7OqTk25B1uR3LA52N0e8e2gzhgiqHbuhDQEz8rn6l0bKD6heU0pj7xbmXdI9/efEnY Htj4Yzsns08p8EwYgBxgjhfTM79jeKh5c7WEPzDHerQcr3DmEOQNsPItRlv7I5qoMrwfH 59qIOOcVVPsq85lj8rqg7hf1bHQA0qh3vaPEhxfoAwOgdrS7Dl5HopMrhAJIIAV4hoIa8 EpYej0Nt9r9IcBdireax9dXZ/SxHnHdEPMncVfqxDLpIzEoalTRjmAsgqV+4N4fJ+2A== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794342092; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-Id:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=DkWfkzdkG8JnZPnLVaaxVwnhsNZ1KUyME4j3NgArqy4=; b=Z8WyKi3tYdnLeTaUeunv81uUJ+02psCwJ/vFgr5d+HS87U8H2Klt1wUW4VRHTurEUdkN YatEX10+Vl4RI9WkoEuEITkc6ijj4/sFAYCwkVxGEjNj4wSYN53MJ5cmp1av+lY4v7YmF Rtu95ZiiKfPg3cpcfDInSat1sB4KTdCITYWInaijhOwkaMx9IaDuC56qgWAorJrkQZwgo mBavrRUquPHjVqCCSZzcz/0ig+qXiszODva9koDwjYnZPI/mWX+sP66eOZ3JncRSlszg4 rmRxDFHPjxIYPOScTpsGEw3TF9Nw//joMr1+f33QyUSEGKQjPBjDv3UB/bEqpgTH8DQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=MW3DPdZP; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3705360A5BC4 for ; Tue, 10 Nov 2026 20:21:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=MW3DPdZP Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5AD6E1F0089F; Tue, 10 Nov 2026 20:21:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794342092; bh=DkWfkzdkG8JnZPnLVaaxVwnhsNZ1KUyME4j3NgArqy4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MW3DPdZPavU+zKRqSawyhYFMiSgqkT05HfqhIhc/hG2TTRXLTF/D6CRbrp4k5Goln dYyRAKxC5Dw+3r/FEDrqVZtoosqwMSrklxq5V4APE6lpQW+lgNsd2QPr3wpgRYSiW+ 8qZIaQXjYazDMIRZ7/h5JIhvbH9rO6IhWT86Ft+A118dpP11bzod9Pm4ZkU40Eo/sc Yu20a0HSfGxA9FJGUojR7u5VjQml7vg4fUHNrEtQP6cFXrpXbX5wvptGLGidcatdrz /YJRfpUMnBnTZpIM3KdhOPIAWFbKf0imBZVxr/mf6AwiI/ZdDQuoJdVYMKNS8rQPRe IK5j/F42nUO5A== From: "Barry Song (Xiaomi)" To: akpm@linux-foundation.org, linux-mm@kvack.org Cc: axelrasmussen@google.com, baolin.wang@linux.alibaba.com, baoquan.he@linux.dev, hannes@cmpxchg.org, hui.zhu@linux.dev, kasong@tencent.com, kunwu.chan@gmail.com, liam@infradead.org, lianux.mm@gmail.com, linux-kernel@vger.kernel.org, liuxiang.277@bytedance.com, lyugaofei@xiaomi.com, mhocko@kernel.org, mhocko@suse.com, qi.zheng@linux.dev, ridong.chen@linux.dev, rppt@kernel.org, ryncsn@gmail.com, shakeel.butt@linux.dev, surenb@google.com, wangzicheng@honor.com, weixugc@google.com, yuanchu@google.com, zhangbo56@xiaomi.com, zhuhui@kylinos.cn, sidchintamaneni@gmail.com, "Barry Song (Xiaomi)" Subject: [PATCH v6 11/15] mm/mglru: Restrict eviction accounting to eligible zones Date: Wed, 11 Nov 2026 04:20:21 +0800 Message-Id: <20261110202025.25736-12-baohua@kernel.org> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20261110202025.25736-1-baohua@kernel.org> References: <20261110202025.25736-1-baohua@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit For both lruvec_evictable_size() and lru_gen_imbalanced(), only count eligible zones below sc->reclaim_idx. This avoids inflating the number of scanned pages and allows aging to proceed more promptly when eligible zones have few folios. Signed-off-by: Barry Song (Xiaomi) --- mm/trace_vmscan.h | 4 ++-- mm/vmscan.c | 8 ++++---- mm/vmscan.h | 5 +++-- 3 files changed, 9 insertions(+), 8 deletions(-) diff --git a/mm/trace_vmscan.h b/mm/trace_vmscan.h index 565c56428364..9dafdb5bd3ce 100644 --- a/mm/trace_vmscan.h +++ b/mm/trace_vmscan.h @@ -488,9 +488,9 @@ TRACE_EVENT(mm_mglru_aging, unsigned long seq = max_seq - MAX_NR_GENS + 1 + i; __entry->nr_anon[i] = - lruvec_gen_size(lrugen, LRU_GEN_ANON, seq); + lruvec_gen_size(lrugen, LRU_GEN_ANON, seq, MAX_NR_ZONES); __entry->nr_file[i] = - lruvec_gen_size(lrugen, LRU_GEN_FILE, seq); + lruvec_gen_size(lrugen, LRU_GEN_FILE, seq, MAX_NR_ZONES); } __entry->nid = lruvec_pgdat(lruvec)->node_id; __entry->priority = sc->priority; diff --git a/mm/vmscan.c b/mm/vmscan.c index 8014a90e4bc2..bfc9789a999a 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4220,7 +4220,7 @@ static void lruvec_evictable_size(struct lruvec *lruvec, int swappiness, for_each_evictable_type(type, swappiness) { for (seq = min_seq[type]; seq <= max_seq; seq++) - nr[type] += lruvec_gen_size(lrugen, type, seq); + nr[type] += lruvec_gen_size(lrugen, type, seq, sc->reclaim_idx + 1); } } @@ -5080,9 +5080,9 @@ static bool lru_gen_imbalanced(struct lruvec *lruvec, struct scan_control *sc, for_each_evictable_type(type, swappiness) { unsigned long seq; - youngest[type] = lruvec_gen_size(lrugen, type, max_seq); + youngest[type] = lruvec_gen_size(lrugen, type, max_seq, sc->reclaim_idx + 1); for (seq = min_seq[type]; seq < max_seq; seq++) - old[type] += lruvec_gen_size(lrugen, type, seq); + old[type] += lruvec_gen_size(lrugen, type, seq, sc->reclaim_idx + 1); } /* the vast majority of pages sit in the youngest gen */ @@ -5826,7 +5826,7 @@ static int lru_gen_seq_show(struct seq_file *m, void *v) char mark = full && seq < min_seq[type] ? 'x' : ' '; seq_printf(m, " %10lu%c", - lruvec_gen_size(lrugen, type, seq), mark); + lruvec_gen_size(lrugen, type, seq, MAX_NR_ZONES), mark); } seq_putc(m, '\n'); diff --git a/mm/vmscan.h b/mm/vmscan.h index c6b583fc7493..2599d7c614ac 100644 --- a/mm/vmscan.h +++ b/mm/vmscan.h @@ -119,12 +119,13 @@ struct scan_control { #ifdef CONFIG_LRU_GEN /* The number of pages of @type in the generation @seq, summed over all zones */ static inline unsigned long lruvec_gen_size(struct lru_gen_folio *lrugen, - int type, unsigned long seq) + int type, unsigned long seq, + int max_zone) { int gen = lru_gen_from_seq(seq); unsigned long size = 0; - for (int zone = 0; zone < MAX_NR_ZONES; zone++) + for (int zone = 0; zone < max_zone; zone++) size += max(READ_ONCE(lrugen->nr_pages[gen][type][zone]), 0L); return size; -- 2.34.1