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Fri, 21 Aug 2026 08:17:03 +0000 X-Mizu-Trace-ID: 487007466bb3646c X-Migadu-Flow: FLOW_OUT From: Ridong Chen To: Andrew Morton , Johannes Weiner Cc: David Hildenbrand , Michal Hocko , Qi Zheng , Shakeel Butt , Lorenzo Stoakes , Kairui Song , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ridong Chen , Ridong Chen Subject: [RFC PATCH 0/4] mm/vmscan: honour node reclaim limits per type Date: Fri, 21 Aug 2026 16:16:37 +0800 Message-Id: <20260821081641.1339788-1-ridong.chen@linux.dev> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: m8wi6syz3bhoqwhh9qhzophuadw313yw X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 696ED20009 X-HE-Tag: 1787300225-267576 X-HE-Meta: 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 /3zb8Ct+ HjNKSdMuIsV/ZFA+xkPuyPYdB9wFx/NseXRIwRRxa71OLYHyP6XrHnvLxdWCS4CTKrliK9ytmTjVWuQjOH8Jk4R0rltf1zXo6TQ+gfMV+qnOC8R1CdPRgp8OLfdMOzDLyxsNdVUIjIMOACd7BbaBctzO2vOsEleBthIiYtnr+aTVD9OX5YJnhtQUxv4ecFCKkEF+1VlshKuLj80hLBkWKjMJ8OXMq/8VIgN2/Oi+wB3ZUzB4saOLf6nY4kgwYsScTsEKguwjPs8AC6PgJ/0C0Q3A4UMK7SvEr53K9zPz97/V7QSQFX6vKgna7OA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ridong Chen min_unmapped_pages and min_slab_pages are documented as per-type limits, but node reclaim treats them as one combined gate: once either is exceeded, shrink_node() reclaims slab, file and anon together and pushes the other type below its limit. Per-node proactive reclaim reuses the same gate and fares worse -- with page cache and slab both under their limits it reclaims nothing and returns -EAGAIN on an anon-heavy node [1]. This series gates each type separately via two scan_control flags (skip_slab_reclaim, skip_file_reclaim) set only on the node reclaim path, drops the combined gate, and extends node_reclaim()'s early bail to check anon. The flags default to zero, so kswapd, direct, memcg and drop_caches are unaffected. Tested on QEMU (x86_64, 2 NUMA nodes), A/B kernels differing only in this series. Proactive reclaim (echo to node/reclaim) on an anon-heavy node, file and slab under their limits: metric before after ----------------- ------ ----------- pages reclaimed 0 MiB 254 MiB anon return value -EAGAIN 0 Node reclaim (zone_reclaim_mode) with one type under its limit -- the type under its limit must be left alone: type under limit before after ----------------- ------------- -------- slab 645 scans 0 scans page cache 83 MiB scanned 0 MiB [1] https://sashiko.dev/#/patchset/20260723045718.2052070-1-ridong.chen@linux.dev Ridong Chen (4): mm/vmscan: only reclaim slab in node reclaim when over min_slab_pages mm/vmscan: only reclaim file pages in node reclaim when over min_unmapped_pages mm/vmscan: drop the combined limit gate in __node_reclaim() mm/vmscan: do not skip node reclaim when only anon is reclaimable mm/vmscan.c | 89 ++++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 67 insertions(+), 22 deletions(-) -- 2.34.1