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=1794693559; b=ztGUKF9tZl4CKtbevDkLFF4+GhCFOXfJQDqigVt14RlqibYNQeDSe38aHFEls1NpLajv pZBd6jV3MJY8NLjpmkkDM9xu2DbGJCuUDTkAwQ7MQMr78nh9ffqJKl/8VQPwKHIux1Q62 JWCk0nqclZ4P6Kc3HM+0MOMut18lM95kjcuUfXI9G09UOXm9EVbuBoDyecZLJUQx2sekJ ZA8vHgrGAvzjT7YcyAuBeUMMapzSZttQv3wkoqWv0jZ5I4+lDVliwdQAr2T5x5bOhEOMK +96Lm7O3U3/UtJiIPhiun0UxXC0fwDwugcv0ATmX2/8unx/nxbIY9QJ351efrP6pZrA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794693559; h=Received:DKIM-Signature:Date:To:From:Subject:Message-Id; bh=ZHu0FKvPgyR2NuPJp3RICjbGrqXwCbfm2QZeN1iKetM=; b=OpLZer6Hh+knrNc/Ps15Fa+PdZxXhHykNzI1wJgcnGC1e4t413nySy6brDPFgrlHewM5 f20LETTKvq3GkkIfV2m2Zi1kaChz1qCehoKagDY5WXx6KH3GsGLt2sBKyk4x/WY/SS8I6 n5KpvyQA2Ju+NO7lw9xxiMVBWtzgdda+8t2IpCdkM55/PXRoHzl0NG5ZfLPwbgXAjTWkl tlwNmEWDJsDSla775JGw6CxXgVOrxK/3ndHrzDUleI0To08cQWVI5ujykZoLy1QOCOsMf KcN2qIOladw2IcrL9FuLKAezsLEwtL0kOXJSwsvKea9uET9/I+iWDCgghEMyr4GVRRw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b="YQMu/CUX"; 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 605FF606A327 for ; Sat, 14 Nov 2026 21:59:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=YQMu/CUX Received: by smtp.kernel.org (Postfix) with ESMTPSA id 29D2A1F000C4; Sat, 14 Nov 2026 21:59:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1794693559; bh=ZHu0FKvPgyR2NuPJp3RICjbGrqXwCbfm2QZeN1iKetM=; h=Date:To:From:Subject; b=YQMu/CUXgYFl73gIU1OiAJasGbCpMeO4kyzGeu8d4HTfhSgHR60DyhzifrhpEeMNM /TnYKihfTQyCECLaLIIZ0jedIjVdz4t/4QoVJ+JyVbALkorlVPIueBirC48reo4TfF UTLnoYXlI8Marz66MoFcE8LkZXDLQ5vi5KNXRthE= Date: Sat, 14 Nov 2026 13:59:18 -0800 To: mm-commits@vger.kernel.org,baohua@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] mm-mglru-run-aging-when-one-type-has-no-populatable-folios.patch removed from -mm tree Message-Id: <20261114215919.29D2A1F000C4@smtp.kernel.org> X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list The quilt patch titled Subject: mm/mglru: run aging when one type has no populatable folios has been removed from the -mm tree. Its filename was mm-mglru-run-aging-when-one-type-has-no-populatable-folios.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: "Barry Song (Xiaomi)" Subject: mm/mglru: run aging when one type has no populatable folios Date: Sat, 14 Nov 2026 02:55:36 +0800 We may have scan budget remaining for anon or file but no folios in populatable generations to scan. In this case, `scan_folios()` may waste time scanning that type while the other type still has populatable folios. Run aging in this case to make more folios populatable. This also helps respect the scan budget distribution determined by swappiness. To avoid excessive aging, allow no-populatable aging only once per `try_to_shrink_lruvec()` invocation. With extreme swappiness values such as 1 and 200, reclaim initially focuses exclusively on the preferred type. In this case, defer aging the lagging type until `sc->priority` reaches `DEF_PRIORITY / 2`. This avoids unnecessary aging and has shown better performance in testing. Link: https://lore.kernel.org/20261113185541.70203-12-baohua@kernel.org Signed-off-by: Barry Song (Xiaomi) Signed-off-by: Andrew Morton Cc: Axel Rasmussen Cc: Baolin Wang Cc: Baoquan He Cc: Johannes Weiner Cc: Cc: Kairui Song Cc: Kunwu Chan Cc: Liam R. Howlett Cc: wang lian Cc: Cc: Cc: Michal Hocko Cc: Qi Zheng Cc: Ridong Chen Cc: Mike Rapoport Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: wangzicheng Cc: Wei Xu Cc: Yuanchu Xie Cc: Bo Zhang Cc: Hui Zhu Cc: Siddharth Chintamaneni Cc: Bo Zhang --- mm/vmscan.c | 49 ++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 38 insertions(+), 11 deletions(-) --- a/mm/vmscan.c~mm-mglru-run-aging-when-one-type-has-no-populatable-folios +++ a/mm/vmscan.c @@ -5109,7 +5109,8 @@ static bool lru_gen_imbalanced(struct lr } static bool should_run_aging(struct lruvec *lruvec, unsigned long max_seq, - struct scan_control *sc, int swappiness) + struct scan_control *sc, int swappiness, + bool no_populatable) { DEFINE_MIN_SEQ(lruvec); @@ -5121,6 +5122,13 @@ static bool should_run_aging(struct lruv if (sc->priority == DEF_PRIORITY) return false; + /* + * Run aging if scan budget remains but no folios + * in populatable generations are available to scan. + */ + if (no_populatable) + return true; + /* better to run aging even though eviction is still possible */ if (evictable_min_seq(min_seq, swappiness) + MIN_NR_GENS == max_seq) return true; @@ -5208,6 +5216,13 @@ static bool try_to_shrink_lruvec(struct bool need_rotate = false, should_age = false; int swappiness = get_swappiness(lruvec, sc); struct mem_cgroup *memcg = lruvec_memcg(lruvec); + /* + * Avoid aging the lagging type under extreme swappiness, + * as reclaim of the unpreferred type is disabled until + * DEF_PRIORITY / 2. + */ + bool allow_no_populatable_age = (sc->priority <= DEF_PRIORITY / 2) || + (swappiness > MIN_SWAPPINESS + 1 && swappiness < MAX_SWAPPINESS); /* * Proactive reclaim initiated by userspace for anonymous memory only. @@ -5225,22 +5240,19 @@ static bool try_to_shrink_lruvec(struct lru_gen_prepare_scan(lruvec, sc, memcg, swappiness, nr); while (nr[LRU_GEN_ANON] > 0 || nr[LRU_GEN_FILE] > 0) { - DEFINE_MAX_SEQ(lruvec); + unsigned long orig_file, orig_anon; + unsigned long max_seq; + bool no_populatable; + long scanned; if (mem_cgroup_below_min(sc->target_mem_cgroup, memcg)) { need_rotate = true; break; } - if (should_run_aging(lruvec, max_seq, sc, swappiness)) { - trace_mm_mglru_aging(lruvec, sc, swappiness); - if (try_to_inc_max_seq(lruvec, max_seq, swappiness, false)) - need_rotate = true; - should_age = true; - } - - if (!evict_folio_lists(nr, lruvec, sc, swappiness, MIN_LRU_BATCH)) - break; + orig_anon = nr[LRU_GEN_ANON]; + orig_file = nr[LRU_GEN_FILE]; + scanned = evict_folio_lists(nr, lruvec, sc, swappiness, MIN_LRU_BATCH); if (should_abort_scan(lruvec, sc)) break; @@ -5252,6 +5264,21 @@ static bool try_to_shrink_lruvec(struct if (root_reclaim(sc) && should_age) break; + /* Limit no_populatable aging to once per try_to_shrink_lruvec() */ + no_populatable = allow_no_populatable_age && + ((nr[LRU_GEN_ANON] && nr[LRU_GEN_ANON] == orig_anon) || + (nr[LRU_GEN_FILE] && nr[LRU_GEN_FILE] == orig_file)); + allow_no_populatable_age &= !no_populatable; + max_seq = READ_ONCE((lruvec)->lrugen.max_seq); + if (should_run_aging(lruvec, max_seq, sc, swappiness, no_populatable)) { + trace_mm_mglru_aging(lruvec, sc, swappiness); + if (try_to_inc_max_seq(lruvec, max_seq, swappiness, false)) + need_rotate = true; + should_age = true; + } + if (!scanned) + break; + cond_resched(); } _ Patches currently in -mm which might be from baohua@kernel.org are arm64-vmalloc-allow-arch_vmap_pte_range_map_size-to-batch-multiple-cont_pte.patch mm-vmalloc-extend-page-table-walk-to-support-larger-page_shift-sizes-and-eliminate-page-table-rewalk.patch mm-vmalloc-map-contiguous-pages-in-batches-for-vmap-if-possible.patch mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch mm-mglru-restrict-eviction-accounting-to-eligible-zones.patch mm-mglru-reduce-lru-lock-contention-by-shrinking-folio-batches-in-inc_min_seq.patch mm-mglru-make-swappiness=1-file-reclaim-more-aggressive.patch