From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0EDCC296BCF for ; Thu, 27 Aug 2026 02:08:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787796510; cv=none; b=S2NMCZAy2Bi5z9gMJfehQn/YHBJ3kvJjS6yqHBW3m5rAHVi3eYIBVT/3lqRSzwgYIpKmNOwi6jQuHykXxwcRkCj5nLoy1UGMluz5Ntm1kzQrMLPxoizmfVmL9NlMsb0g3FL0whYRfowpxhNKZrs+YyVOWr6app7p+5QXcgLez80= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787796510; c=relaxed/simple; bh=UeVLYJ6ZyL/9e54sFd08yV3PtwRm8kGwAQD9sP2fQus=; h=Date:To:From:Subject:Message-Id; b=IZXcrXI9F3v8uKZ1IS9RR1WVlYHQecQ4X0yx2vlZoiWbf4o8LFwLCxtTXFfU0QfXd9eiJk/+TUG4qZPm+WZ7UkD9r13ZVoUB89OduTPs5DxE2HhbYFy73LGkodxfXYckV8sxudPOlnkfPspPrdGdB1ydW+tI809QRNdeWf1KCoM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=FO85yBqy; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="FO85yBqy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB4CB1F000E9; Thu, 27 Aug 2026 02:08:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1787796508; bh=YBBlqowCOtoIaESVd/SV2pBmfM35+Bx0oMT5JE6FTkU=; h=Date:To:From:Subject; b=FO85yBqyv7hgdkW3yM5UT4TZoZmsr5l8NPqlla46R2d3XIgtM2evHBYgoNnBkyawj s+J9Oso9xcY+nNB4qp2iybrfzguJZM5g3/P3IHPWvbGoYTF2uvEoOShVqycifGKubY L3Y+XckCmDNj2g6Nn+zlBSWM3uIhhgtKG5o69L4s= Date: Wed, 26 Aug 2026 19:08:28 -0700 To: mm-commits@vger.kernel.org,yuanchu@google.com,weixugc@google.com,shakeel.butt@linux.dev,roman.gushchin@linux.dev,mhocko@suse.com,ljs@kernel.org,kasong@tencent.com,hannes@cmpxchg.org,david@kernel.org,dave@stgolabs.net,baohua@kernel.org,axelrasmussen@google.com,chenridong@xiaomi.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-vmscan-drop-the-combined-limit-gate-in-__node_reclaim.patch added to mm-new branch Message-Id: <20260827020828.CB4CB1F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/vmscan: drop the combined limit gate in __node_reclaim() has been added to the -mm mm-new branch. Its filename is mm-vmscan-drop-the-combined-limit-gate-in-__node_reclaim.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmscan-drop-the-combined-limit-gate-in-__node_reclaim.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Ridong Chen Subject: mm/vmscan: drop the combined limit gate in __node_reclaim() Date: Wed, 26 Aug 2026 20:44:09 +0800 __node_reclaim() is called from two paths: node_reclaim() and user_proactive_reclaim(). node_reclaim() already bails out early unless node_pagecache_reclaimable() is over pgdat->min_unmapped_pages or the reclaimable slab is over pgdat->min_slab_pages. The identical check inside __node_reclaim() that guards the shrink_node() loop is therefore redundant for this path. user_proactive_reclaim() is proactive reclaim driven by userspace and should not be gated by the per-node min_unmapped_pages / min_slab_pages limits at all [1]. With the gate in place, a proactive request is silently turned into a no-op whenever the node happens to sit below both thresholds. Drop the gate in __node_reclaim() and always run the shrink_node() loop. The node_reclaim() path is unchanged, since its caller has already applied the same test; the proactive path is no longer wrongly gated. Link: https://lore.kernel.org/20260826124409.35569-1-ridong.chen@linux.dev Link: https://sashiko.dev/#/patchset/20260723045718.2052070-1-ridong.chen@linux.dev [1] Fixes: b980077899ea ("mm: introduce per-node proactive reclaim interface") Assisted-by: Claude:claude-opus-4-8 Acked-by: Johannes Weiner Signed-off-by: Ridong Chen Acked-by: Michal Hocko Acked-by: Shakeel Butt Cc: Axel Rasmussen Cc: Barry Song Cc: David Hildenbrand Cc: Davidlohr Bueso Cc: Kairui Song Cc: Lorenzo Stoakes Cc: Roman Gushchin Cc: Wei Xu Cc: Yuanchu Xie Signed-off-by: Andrew Morton --- mm/vmscan.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) --- a/mm/vmscan.c~mm-vmscan-drop-the-combined-limit-gate-in-__node_reclaim +++ a/mm/vmscan.c @@ -7851,16 +7851,9 @@ static unsigned long __node_reclaim(stru noreclaim_flag = memalloc_noreclaim_save(); set_task_reclaim_state(p, &sc->reclaim_state); - if (node_pagecache_reclaimable(pgdat) > pgdat->min_unmapped_pages || - node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B) > pgdat->min_slab_pages) { - /* - * Free memory by calling shrink node with increasing - * priorities until we have enough memory freed. - */ - do { - shrink_node(pgdat, sc); - } while (sc->nr_reclaimed < nr_pages && --sc->priority >= 0); - } + do { + shrink_node(pgdat, sc); + } while (sc->nr_reclaimed < nr_pages && --sc->priority >= 0); set_task_reclaim_state(p, NULL); memalloc_noreclaim_restore(noreclaim_flag); _ Patches currently in -mm which might be from chenridong@xiaomi.com are mm-vmscan-drop-the-combined-limit-gate-in-__node_reclaim.patch