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Fri, 17 Oct 2025 15:53:42 +0800 From: Baolin Wang To: akpm@linux-foundation.org, hannes@cmpxchg.org Cc: david@redhat.com, mhocko@kernel.org, zhengqi.arch@bytedance.com, shakeel.butt@linux.dev, lorenzo.stoakes@oracle.com, hughd@google.com, willy@infradead.org, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] mm: vmscan: filter out the dirty file folios for node_reclaim() Date: Fri, 17 Oct 2025 15:53:06 +0800 Message-ID: X-Mailer: git-send-email 2.43.7 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: DDBCE1C0005 X-Stat-Signature: 5o31pp5ctx86bxee8sseg3zjhi7re8ho X-Rspam-User: X-HE-Tag: 1760687625-596059 X-HE-Meta: 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 FBdI7yrv zA/Ge7l8Gc6/ZPwZx/+xFodhpCQcpLNx5VwNQnzZ4iok8ESmVSduYWnGDKa2Dg2dQlVMsQXBiMZho2MjgYjNXPqfTlSq8wrJoYYFXPyxS/A1AIndm+4unS2jwLAcq7YsKIf38Qkw0OzotxLkc9QKfaJ5ACUc5htoBS0PXNzoXdQu3AYBvZDhksXTSkXvpYXlheOS+mMrScoiHg1TP7ChzmEIDGfxylHcNa/LWV1ZXrG6cWI61L0o7fvqeDYeOfb3uv/pqM0nHWcDUMHb+WTCVM0ocHQTyNAbM1Y4/gM8zr08sR0A= 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: After commit 6b0dfabb3555 ("fs: Remove aops->writepage"), we no longer attempt to write back filesystem folios in pageout(), and only tmpfs/shmem folios and anonymous swapcache folios can be written back. Therefore, we should also filter out the dirty filesystem folios for node_reclaim() to avoid unnecessary LRU scans. Signed-off-by: Baolin Wang --- mm/vmscan.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index c80fcae7f2a1..65f299e4b8f0 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -7601,9 +7601,11 @@ static unsigned long node_pagecache_reclaimable(struct pglist_data *pgdat) else nr_pagecache_reclaimable = node_unmapped_file_pages(pgdat); - /* If we can't clean pages, remove dirty pages from consideration */ - if (!(node_reclaim_mode & RECLAIM_WRITE)) - delta += node_page_state(pgdat, NR_FILE_DIRTY); + /* + * Since we can't clean folios through reclaim, remove dirty file + * folios from consideration. + */ + delta += node_page_state(pgdat, NR_FILE_DIRTY); /* Watch for any possible underflows due to delta */ if (unlikely(delta > nr_pagecache_reclaimable)) -- 2.43.7