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Fri, 21 Aug 2026 08:18:01 +0000 X-Mizu-Trace-ID: 89c40d2368cbfa1d 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 16:17:37 +0800 Message-Id: <20260821081741.1340277-1-ridong.chen@linux.dev> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 7D12940002 X-Rspam-User: X-Stat-Signature: m8wi6syz3bhoqwhh9qhzophuadw313yw X-Rspamd-Server: rspam06 X-HE-Tag: 1787300282-405385 X-HE-Meta: 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 xozic8Tc Kb64sGPJr60lVh7JFKgA//AaVtjsmOOyZza16w+DtHEkVzZa5apDQIOV3QxvhfjnDBWqTluq5SCRd4VH7H6uhNm6l9QQL3EwTe5VNkrZ7rK12aVUOA+bi4GrEWXY3z8hpYiC1eTP48sroRXXYhui+SLOIGdo5v9VWJbtcIT9+18lmcTi6Qj029tXhpAmcpv2jwsyQxWbXv5k8w9wI6+akxAE83MO+nBrdoSEouWRG7sPKxmXmiyjfRkT/NbwKAMrg4HZrrDgq0y5ryUYYeM3CdydowOhcgu6HdwK/wQ6U7JzYU1pF6F0b1QiKtw== 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