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=1794599438; b=HteORNK7KlmbXTy0z8+5bekiV974v8Kf6m/UU4WC/gSJ+iMb7NnFbAP/y2mQt4fFDxch chvi8FbGMHfrNlUCdEhfjO00/vgJcHLcITzkh5YhWP7R38YQ1xd9lXajZF4cDpd4Fdrd7 GNZoeqbvS9m9hO+Kb/AFWKQHmBKx05d75BzzMfoRN1bqRg8GUDBc4FPsgKRY7MAzAHTWe S4Mp8pY1qcEkypBumQfygdlxYeB95tHcUAy4Bx6Kee5ZfPfha7xi2Sw1iEwDzMg13+zto AkO1dYdkcStZN3EvRA5E6uU39EIE8rcB0DKnVZAMpKtfPnImVWK2sJlFEsrhx1kgLrg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794599438; h=Received:DKIM-Signature:Date:To:From:Subject:Message-Id; bh=ylUqjS09JwbrcVf6K56wB48UcCKn4bf9ENS/eNAxCbI=; b=ai6luN8I3QVw9QyyUJAuPKtbbhAEXLIBmWFj2SvRs7XBINgygIXU55k9eo0pUbo7lEYo gQXaOZdNusms7B0KQ6mxof9m35D7TEIJhEmDXlJsBhZnpL5nqbwnjSDuzV3IZzV5Kj3Cg znPKXx68bwg3zdWBjdF34MJY6JkA+WdOzaJjokFtmv69GjM9TCtGO3WTbbKIxxS6bP1ZC 43MAEvIPZWRoZM7KEh78RCr1PdVwlBwYppRH0vvrFnm2wshFtPkTCkiE6NeBiLHxnsm5Y Hy6ZZOkGKZJD2Z4IoE6aJeSJhmLnisoNScbImkCj9LQTzcX4tiikdEk5U31jhk2AnXA== 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=1K9wizvx; 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 48A35606A323 for ; Fri, 13 Nov 2026 19:50:37 +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=1K9wizvx Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE5E31F000C6; Fri, 13 Nov 2026 19:50:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1794599437; bh=ylUqjS09JwbrcVf6K56wB48UcCKn4bf9ENS/eNAxCbI=; h=Date:To:From:Subject; b=1K9wizvxeqe456rLQIeMmv2Urn0jrIVjQlAqCZAl30b7MU4Y1i4YsFSGjjkGjXcYx UppW/66LQowH+VceUCzsXLgNVs+1jCHp2m5ni1qpeZBi7HqaAasme5jM4ff3H7c342 l3DDSg042HF8/YKGQmkKpRr/g2XnJmKDJwgnXTFk= Date: Fri, 13 Nov 2026 11:50:37 -0800 To: mm-commits@vger.kernel.org,kasong@tencent.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-mglru-extract-lruvec_populated_min_seq-helper.patch added to mm-new branch Message-Id: <20261113195037.BE5E31F000C6@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 patch titled Subject: mm/mglru: extract lruvec_populated_min_seq() helper has been added to the -mm mm-new branch. Its filename is mm-mglru-extract-lruvec_populated_min_seq-helper.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mglru-extract-lruvec_populated_min_seq-helper.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: Kairui Song Subject: mm/mglru: extract lruvec_populated_min_seq() helper Date: Sat, 14 Nov 2026 02:55:27 +0800 The search for the oldest populated generation of a type, previously embedded in try_to_inc_min_seq(), is extracted into the new lruvec_populated_min_seq() helper. It returns the oldest populated seq of a given type, bounded by the given max_seq so the search never goes beyond it. No functional change. Link: https://lore.kernel.org/20261113185541.70203-3-baohua@kernel.org Signed-off-by: Kairui Song Signed-off-by: Barry Song (Xiaomi) Signed-off-by: Andrew Morton Reviewed-by: Kunwu Chan Cc: Axel Rasmussen Cc: Baolin Wang Cc: Baoquan He Cc: Johannes Weiner Cc: Cc: Liam R. Howlett Cc: wang lian Cc: Cc: Cc: Michal Hocko Cc: Qi Zheng Cc: Ridong Chen Cc: Mike Rapoport Cc: Kairui Song Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: wangzicheng Cc: Wei Xu Cc: Yuanchu Xie Cc: Bo Zhang Cc: Hui Zhu Cc: Siddharth Chintamaneni Cc: Kunwu Chan Cc: Bo Zhang --- mm/vmscan.c | 45 +++++++++++++++++++++++++++++---------------- 1 file changed, 29 insertions(+), 16 deletions(-) --- a/mm/vmscan.c~mm-mglru-extract-lruvec_populated_min_seq-helper +++ a/mm/vmscan.c @@ -3992,30 +3992,45 @@ done: return true; } +/* Similar to lruvec_evictable_size, return the oldest populated seq of the type */ +static unsigned long lruvec_populated_min_seq(struct lruvec *lruvec, int type, + unsigned long max_seq) +{ + int gen, zone; + unsigned long min_seq; + struct lru_gen_folio *lrugen = &lruvec->lrugen; + + lockdep_assert_held(&lruvec->lru_lock); + + min_seq = READ_ONCE(lrugen->min_seq[type]); + while (min_seq <= max_seq) { + gen = lru_gen_from_seq(min_seq); + for (zone = 0; zone < MAX_NR_ZONES; zone++) { + if (!list_empty(&lrugen->folios[gen][type][zone])) + return min_seq; + } + min_seq++; + } + + return max_seq; +} + static void try_to_inc_min_seq(struct lruvec *lruvec, int swappiness) { - int gen, type, zone; + int type; bool seq_inc_flag = false; struct lru_gen_folio *lrugen = &lruvec->lrugen; DEFINE_MIN_SEQ(lruvec); + unsigned long seq; VM_WARN_ON_ONCE(!seq_is_valid(lruvec)); - /* find the oldest populated generation */ + /* Requires at least MIN_NR_GENS gens for basic functionality */ + seq = lrugen->max_seq - MIN_NR_GENS; for_each_evictable_type(type, swappiness) { - while (min_seq[type] + MIN_NR_GENS <= lrugen->max_seq) { - gen = lru_gen_from_seq(min_seq[type]); - - for (zone = 0; zone < MAX_NR_ZONES; zone++) { - if (!list_empty(&lrugen->folios[gen][type][zone])) - goto next; - } - - min_seq[type]++; + min_seq[type] = lruvec_populated_min_seq(lruvec, type, seq + 1); + if (min_seq[type] > lrugen->min_seq[type]) seq_inc_flag = true; - } -next: - ; } /* @@ -4027,8 +4042,6 @@ next: /* see the comment on lru_gen_folio */ if (swappiness && swappiness <= MAX_SWAPPINESS) { - unsigned long seq = lrugen->max_seq - MIN_NR_GENS; - if (min_seq[LRU_GEN_ANON] > seq && min_seq[LRU_GEN_FILE] < seq) min_seq[LRU_GEN_ANON] = seq; else if (min_seq[LRU_GEN_FILE] > seq && min_seq[LRU_GEN_ANON] < seq) _ Patches currently in -mm which might be from kasong@tencent.com are mm-mglru-report-evictable-sizes-per-type.patch mm-mglru-extract-lruvec_populated_min_seq-helper.patch mm-mglru-reclaim-from-the-oldest-populated-gen.patch mm-mglru-lift-the-forced-protection-of-reclaimer.patch mm-mglru-skip-zones-above-reclaim_idx-instead-of-rotating-them.patch mm-mglru-return-for-unavailable-anon-reclaim-earlier.patch mm-mglru-balance-anon-and-file-scan-budget-by-refault-rate.patch mm-mglru-lift-youngest-gen-protection-for-higher-priority.patch