From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AC071EFD204 for ; Wed, 25 Feb 2026 07:50:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 184BC6B0095; Wed, 25 Feb 2026 02:50:25 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 13C5D6B0096; Wed, 25 Feb 2026 02:50:25 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0724B6B0098; Wed, 25 Feb 2026 02:50:25 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id E466F6B0095 for ; Wed, 25 Feb 2026 02:50:24 -0500 (EST) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id B129058D6C for ; Wed, 25 Feb 2026 07:50:24 +0000 (UTC) X-FDA: 84482206368.11.BF48EF2 Received: from out-188.mta0.migadu.com (out-188.mta0.migadu.com [91.218.175.188]) by imf30.hostedemail.com (Postfix) with ESMTP id 27B468000C for ; Wed, 25 Feb 2026 07:50:22 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=utLtwzTr; spf=pass (imf30.hostedemail.com: domain of qi.zheng@linux.dev designates 91.218.175.188 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1772005823; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=776a3yXyenvO+S9oFBjCtWS3YtcAt/IfBD8X6MP7Tkk=; b=XYvl6BFryjEsMzPdXxfYeMTRH0mIABxzHSDzP6mVvnk8lNYbd0FA+mvQx4bax4JtjMN6vZ SCCGXU8UK4Zxh3m60MEgAeo5aB8PphuiNDV2HCIpzrkOJ17Ec957T/wEd7ueYLg+oelP1+ zxCWElFJM0gwg0xjI8l37FcanNiq9Lo= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=utLtwzTr; spf=pass (imf30.hostedemail.com: domain of qi.zheng@linux.dev designates 91.218.175.188 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1772005823; a=rsa-sha256; cv=none; b=4yx8EuncEvcxjfC5lfot+L+uigODpc4+bhjOOlT9+9Y7YyAAX+woU6Wo8GrpbTRKUqav6b 7s97GnCA4AyGbB3yEstCv5D8DaWEWqnDgjDtZ9B0kvGfA/lshxs3X/jFWHvvzfo0/3J9KD gtUVzu2MhmYO5J/K/vybUkeu3aUALNM= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1772005821; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=776a3yXyenvO+S9oFBjCtWS3YtcAt/IfBD8X6MP7Tkk=; b=utLtwzTr3i6olwHUdGoyBR6/JfFqUQPZnypuGaakWQxNy4W+neVfwkE919k6yRwc6k7CSG 2yNerGg1sgIts/FVJY8PsMJwpVlVySwHPFqFrebx+m8GQQrU326J7gfICIubwOZ6jR5+eB TmQcZCdA3oT+V8X6aSVo64OKqV03oYc= From: Qi Zheng To: hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, david@kernel.org, lorenzo.stoakes@oracle.com, ziy@nvidia.com, harry.yoo@oracle.com, yosry.ahmed@linux.dev, imran.f.khan@oracle.com, kamalesh.babulal@oracle.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, chenridong@huaweicloud.com, mkoutny@suse.com, akpm@linux-foundation.org, hamzamahfooz@linux.microsoft.com, apais@linux.microsoft.com, lance.yang@linux.dev, bhe@redhat.com, usamaarif642@gmail.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Muchun Song , Qi Zheng Subject: [PATCH v5 05/32] mm: vmscan: refactor move_folios_to_lru() Date: Wed, 25 Feb 2026 15:48:38 +0800 Message-ID: <6f1dac88b61e2e3cb7a3e90bacdf06b654acfc15.1772005110.git.zhengqi.arch@bytedance.com> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam05 X-Rspam-User: X-Rspamd-Queue-Id: 27B468000C X-Stat-Signature: jg13kaowie68atz5zzuakim9qo1k83fe X-HE-Tag: 1772005822-468852 X-HE-Meta: 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Muchun Song In a subsequent patch, we'll reparent the LRU folios. The folios that are moved to the appropriate LRU list can undergo reparenting during the move_folios_to_lru() process. Hence, it's incorrect for the caller to hold a lruvec lock. Instead, we should utilize the more general interface of folio_lruvec_relock_irq() to obtain the correct lruvec lock. This patch involves only code refactoring and doesn't introduce any functional changes. Signed-off-by: Muchun Song Acked-by: Johannes Weiner Signed-off-by: Qi Zheng Acked-by: Shakeel Butt Reviewed-by: Harry Yoo --- mm/vmscan.c | 46 +++++++++++++++++++++------------------------- 1 file changed, 21 insertions(+), 25 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 2a32dce8d8394..61303ec85d587 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1889,24 +1889,27 @@ static bool too_many_isolated(struct pglist_data *pgdat, int file, /* * move_folios_to_lru() moves folios from private @list to appropriate LRU list. * - * Returns the number of pages moved to the given lruvec. + * Returns the number of pages moved to the appropriate lruvec. + * + * Note: The caller must not hold any lruvec lock. */ -static unsigned int move_folios_to_lru(struct lruvec *lruvec, - struct list_head *list) +static unsigned int move_folios_to_lru(struct list_head *list) { int nr_pages, nr_moved = 0; + struct lruvec *lruvec = NULL; struct folio_batch free_folios; folio_batch_init(&free_folios); while (!list_empty(list)) { struct folio *folio = lru_to_folio(list); + lruvec = folio_lruvec_relock_irq(folio, lruvec); VM_BUG_ON_FOLIO(folio_test_lru(folio), folio); list_del(&folio->lru); if (unlikely(!folio_evictable(folio))) { - spin_unlock_irq(&lruvec->lru_lock); + lruvec_unlock_irq(lruvec); folio_putback_lru(folio); - spin_lock_irq(&lruvec->lru_lock); + lruvec = NULL; continue; } @@ -1928,19 +1931,15 @@ static unsigned int move_folios_to_lru(struct lruvec *lruvec, folio_unqueue_deferred_split(folio); if (folio_batch_add(&free_folios, folio) == 0) { - spin_unlock_irq(&lruvec->lru_lock); + lruvec_unlock_irq(lruvec); mem_cgroup_uncharge_folios(&free_folios); free_unref_folios(&free_folios); - spin_lock_irq(&lruvec->lru_lock); + lruvec = NULL; } continue; } - /* - * All pages were isolated from the same lruvec (and isolation - * inhibits memcg migration). - */ VM_BUG_ON_FOLIO(!folio_matches_lruvec(folio, lruvec), folio); lruvec_add_folio(lruvec, folio); nr_pages = folio_nr_pages(folio); @@ -1949,11 +1948,12 @@ static unsigned int move_folios_to_lru(struct lruvec *lruvec, workingset_age_nonresident(lruvec, nr_pages); } + if (lruvec) + lruvec_unlock_irq(lruvec); + if (free_folios.nr) { - spin_unlock_irq(&lruvec->lru_lock); mem_cgroup_uncharge_folios(&free_folios); free_unref_folios(&free_folios); - spin_lock_irq(&lruvec->lru_lock); } return nr_moved; @@ -2020,8 +2020,7 @@ static unsigned long shrink_inactive_list(unsigned long nr_to_scan, nr_reclaimed = shrink_folio_list(&folio_list, pgdat, sc, &stat, false, lruvec_memcg(lruvec)); - spin_lock_irq(&lruvec->lru_lock); - move_folios_to_lru(lruvec, &folio_list); + move_folios_to_lru(&folio_list); mod_lruvec_state(lruvec, PGDEMOTE_KSWAPD + reclaimer_offset(sc), stat.nr_demoted); @@ -2030,6 +2029,7 @@ static unsigned long shrink_inactive_list(unsigned long nr_to_scan, mod_lruvec_state(lruvec, item, nr_reclaimed); mod_lruvec_state(lruvec, PGSTEAL_ANON + file, nr_reclaimed); + spin_lock_irq(&lruvec->lru_lock); lru_note_cost_unlock_irq(lruvec, file, stat.nr_pageout, nr_scanned - nr_reclaimed); @@ -2166,16 +2166,14 @@ static void shrink_active_list(unsigned long nr_to_scan, /* * Move folios back to the lru list. */ - spin_lock_irq(&lruvec->lru_lock); - - nr_activate = move_folios_to_lru(lruvec, &l_active); - nr_deactivate = move_folios_to_lru(lruvec, &l_inactive); + nr_activate = move_folios_to_lru(&l_active); + nr_deactivate = move_folios_to_lru(&l_inactive); count_vm_events(PGDEACTIVATE, nr_deactivate); count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE, nr_deactivate); - mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken); + spin_lock_irq(&lruvec->lru_lock); lru_note_cost_unlock_irq(lruvec, file, 0, nr_rotated); trace_mm_vmscan_lru_shrink_active(pgdat->node_id, nr_taken, nr_activate, nr_deactivate, nr_rotated, sc->priority, file); @@ -4731,14 +4729,14 @@ static int evict_folios(unsigned long nr_to_scan, struct lruvec *lruvec, set_mask_bits(&folio->flags.f, LRU_REFS_FLAGS, BIT(PG_active)); } - spin_lock_irq(&lruvec->lru_lock); - - move_folios_to_lru(lruvec, &list); + move_folios_to_lru(&list); walk = current->reclaim_state->mm_walk; if (walk && walk->batched) { walk->lruvec = lruvec; + spin_lock_irq(&lruvec->lru_lock); reset_batch_size(walk); + spin_unlock_irq(&lruvec->lru_lock); } mod_lruvec_state(lruvec, PGDEMOTE_KSWAPD + reclaimer_offset(sc), @@ -4748,8 +4746,6 @@ static int evict_folios(unsigned long nr_to_scan, struct lruvec *lruvec, mod_lruvec_state(lruvec, item, reclaimed); mod_lruvec_state(lruvec, PGSTEAL_ANON + type, reclaimed); - spin_unlock_irq(&lruvec->lru_lock); - list_splice_init(&clean, &list); if (!list_empty(&list)) { -- 2.20.1