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 5781E3F106D for ; Fri, 9 Oct 2026 05:56:39 +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=1791525400; cv=none; b=ewrkb3pwB4GFZPgAo/y98IxmZbMPmtgdNx/x8BB2Cacn3II7dtmEuCb6nmDkWVfghVhyUoJ5zWV2u0Yh5ZWfus9TvYSsHIGKXH8k6YQ8xe7SPyRl3IJG0qZKnW17wXW6L5O12pUzYad451P4CMCQMM/eSZza4FL+WyTCkYCZOhg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791525400; c=relaxed/simple; bh=jOPwHAIFud2tprJYZU4D2CO5ciLqXKz0RMQpKcs2g9Y=; h=Date:To:From:Subject:Message-Id; b=I2Ner914O01L49WwVvALr7rqKbRkVQXO7VybcXDcnogQCY4r9CFQkE2b/Gcyk9PL6ngXMm1Anc6QmTNupc2eivERXsx4oD+h5vd9LJ0pqJD+b/SuiWUr+CM27NoSt5hldcYLYzdj5z8P5BbAMB8BExny6NiUZJSaMe6vH+O2sBA= 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=mwQil3vv; 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="mwQil3vv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 306CC1F000FF; Fri, 9 Oct 2026 05:56:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791525399; bh=lpJWpvhwTX1ClD7HW250+AhsG+NUHz4dUSIhKEpy8rE=; h=Date:To:From:Subject; b=mwQil3vvC3MciGjW5IyRprgCjxIuI5baZqyFNdkKnmCkoRVCDOi4ymUszhZjDFCM8 SYEWZtPF6AvxFgiP43Y5PkAPRWNM+BiusDSf/XfL8FioSRDjWIxG6tOkELTHOQc6YE 6cbdKHG5eeNgRChz/Hbn92KXvEA/0C08V/MII9jE= Date: Thu, 08 Oct 2026 22:56:38 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,yuzhao@google.com,yuanchu@google.com,weixugc@google.com,vbabka@kernel.org,shakeel.butt@linux.dev,ryncsn@gmail.com,roman.gushchin@linux.dev,ridong.chen@linux.dev,qi.zheng@linux.dev,muchun.song@linux.dev,mhocko@kernel.org,ljs@kernel.org,lianux.mm@gmail.com,liam@infradead.org,hannes@cmpxchg.org,david@kernel.org,chrisl@kernel.org,baoquan.he@linux.dev,baolin.wang@linux.alibaba.com,baohua@kernel.org,axelrasmussen@google.com,kasong@tencent.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-mglru-introduce-helpers-for-manipulating-gen-and-refs-flags.patch removed from -mm tree Message-Id: <20261009055639.306CC1F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/mglru: introduce helpers for manipulating gen and refs flags has been removed from the -mm tree. Its filename was mm-mglru-introduce-helpers-for-manipulating-gen-and-refs-flags.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Kairui Song Subject: mm/mglru: introduce helpers for manipulating gen and refs flags Date: Sun, 06 Sep 2026 00:51:07 +0800 Instead of doing bit ops on folio->flags.f, introduce helpers for adjusting a folio's refs and generation info, making the code easier to debug and understand. No functional change is intended: some combined atomic operations are split into two, which only creates harmless transient states. There is no measurable performance impact, and some paths even look slightly better in the generated assembly. Link: https://lore.kernel.org/20260906-mglru-flags-cleanup-v6-2-9aacbd77d4ca@tencent.com Signed-off-by: Kairui Song Signed-off-by: Andrew Morton Acked-by: Qi Zheng Reviewed-by: Baolin Wang Reviewed-by: Barry Song Cc: Axel Rasmussen Cc: Baoquan He Cc: Chris Li Cc: David Hildenbrand (Arm) Cc: Johannes Weiner Cc: Kairui Song Cc: Liam R. Howlett Cc: Lian Wang Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Muchun Song Cc: Ridong Chen Cc: Roman Gushchin Cc: Shakeel Butt Cc: Vlastimil Babka Cc: Wei Xu Cc: Yuanchu Xie Cc: Yu Zhao Cc: Zi Yan --- include/linux/mm_inline.h | 84 ++++++++++++++++++++++++++++++++---- include/linux/mmzone.h | 1 mm/folio.c | 19 ++++---- mm/vmscan.c | 60 ++++++++++++++----------- 4 files changed, 122 insertions(+), 42 deletions(-) --- a/include/linux/mm_inline.h~mm-mglru-introduce-helpers-for-manipulating-gen-and-refs-flags +++ a/include/linux/mm_inline.h @@ -142,10 +142,66 @@ static inline int lru_tier_from_refs(int return workingset ? MAX_NR_TIERS - 1 : order_base_2(refs); } -static inline int folio_lru_refs(const struct folio *folio) +/** + * lru_set_gen_flags - Set the LRU generation number to specified folio flags. + * @flags: pointer to the folio flags + * @gen: generation number, between 0 and (MAX_NR_GENS - 1), inclusive. + */ +static inline void lru_set_gen_flags(unsigned long *flags, int gen) +{ + BUILD_BUG_ON(LRU_GEN_MASK & LRU_REFS_MASK); + VM_WARN_ON_ONCE(gen >= MAX_NR_GENS || gen < 0); + /* Store gen offset by 1, zero means the folio is off-list. */ + *flags &= ~LRU_GEN_MASK; + *flags |= (gen + 1UL) << LRU_GEN_PGOFF; +} + +/** + * lru_get_gen_flags - Return the LRU generation number from folio flags. + * @flags: folio flags + * + * Returns: A number between 0 and (MAX_NR_GENS - 1), inclusive. Returns + * -1 if the flags indicate the folio is off the list (e.g., isolated). + */ +static inline int lru_get_gen_flags(unsigned long flags) +{ + int gen = ((flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1; + + /* Exclude the legal -1 from the unsigned MAX_NR_GENS comparison */ + VM_WARN_ON_ONCE(gen != -1 && gen >= MAX_NR_GENS); + return gen; +} + +/** + * lru_set_refs_flags - Set the LRU referenced count to folio flags. + * @flags: pointer to the folio flags + * @refs: referenced / access count number, between 0 and LRU_REFS_MAX, inclusive. + * + * For MGLRU, PG_referenced holds the first ref, and the extra bits hold the + * remaining refs. For classical LRU the extra bits are not used, so it can + * also be seen as the refs count never exceeds 1. In both cases, refs == 1 + * means PG_referenced is set and the extra bits are zero, and refs == 0 means + * PG_referenced and the extra bits are all unset. + */ +static inline void lru_set_refs_flags(unsigned long *flags, unsigned int refs) { - unsigned long flags = READ_ONCE(folio->flags.f); + VM_WARN_ON_ONCE(refs > LRU_REFS_MAX); + BUILD_BUG_ON(LRU_REFS_MAX != (LRU_REFS_MASK >> LRU_REFS_PGOFF) + 1); + + *flags &= ~LRU_REFS_FLAGS; + if (!refs) + return; + *flags |= (BIT(PG_referenced) | ((refs - 1UL) << LRU_REFS_PGOFF)); +} +/** + * lru_get_refs_flags - Return LRU referenced / access count from folio flags. + * @flags: folio flags + * + * Reads the LRU referenced count set by lru_set_refs_flags(). + */ +static inline int lru_get_refs_flags(unsigned long flags) +{ if (!(flags & BIT(PG_referenced))) return 0; /* @@ -155,11 +211,24 @@ static inline int folio_lru_refs(const s return ((flags & LRU_REFS_MASK) >> LRU_REFS_PGOFF) + 1; } -static inline int folio_lru_gen(const struct folio *folio) +static inline int folio_lru_refs(const struct folio *folio) { - unsigned long flags = READ_ONCE(folio->flags.f); + return lru_get_refs_flags(READ_ONCE(*const_folio_flags(folio, 0))); +} - return ((flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1; +static inline void folio_set_lru_refs(struct folio *folio, unsigned int refs) +{ + unsigned long new_flags, old_flags = READ_ONCE(*folio_flags(folio, 0)); + + do { + new_flags = old_flags; + lru_set_refs_flags(&new_flags, refs); + } while (!try_cmpxchg(folio_flags(folio, 0), &old_flags, new_flags)); +} + +static inline int folio_lru_gen(const struct folio *folio) +{ + return lru_get_gen_flags(READ_ONCE(*const_folio_flags(folio, 0))); } static inline bool lru_gen_is_active(const struct lruvec *lruvec, int gen) @@ -270,7 +339,7 @@ static inline bool lru_gen_add_folio(str gen = lru_gen_from_seq(seq); flags = (gen + 1UL) << LRU_GEN_PGOFF; /* see the comment on MIN_NR_GENS about PG_active */ - set_mask_bits(&folio->flags.f, LRU_GEN_MASK | BIT(PG_active), flags); + set_mask_bits(folio_flags(folio, 0), LRU_GEN_MASK | BIT(PG_active), flags); lru_gen_update_size(lruvec, folio, -1, gen); /* for folio_rotate_reclaimable() */ @@ -295,7 +364,7 @@ static inline bool lru_gen_del_folio(str /* for folio_migrate_flags() */ flags = !reclaiming && lru_gen_is_active(lruvec, gen) ? BIT(PG_active) : 0; - flags = set_mask_bits(&folio->flags.f, LRU_GEN_MASK, flags); + flags = set_mask_bits(folio_flags(folio, 0), LRU_GEN_MASK, flags); gen = ((flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1; lru_gen_update_size(lruvec, folio, gen, -1); @@ -339,7 +408,6 @@ static inline bool lru_gen_del_folio(str static inline void folio_migrate_refs(struct folio *new, const struct folio *old) { - } #endif /* CONFIG_LRU_GEN */ --- a/include/linux/mmzone.h~mm-mglru-introduce-helpers-for-manipulating-gen-and-refs-flags +++ a/include/linux/mmzone.h @@ -500,6 +500,7 @@ enum lruvec_flags { #define LRU_GEN_MASK ((BIT(LRU_GEN_WIDTH) - 1) << LRU_GEN_PGOFF) #define LRU_REFS_MASK ((BIT(LRU_REFS_WIDTH) - 1) << LRU_REFS_PGOFF) +#define LRU_REFS_MAX BIT(LRU_REFS_WIDTH) /* * For folios accessed multiple times through file descriptors, --- a/mm/folio.c~mm-mglru-introduce-helpers-for-manipulating-gen-and-refs-flags +++ a/mm/folio.c @@ -354,26 +354,28 @@ static void __lru_cache_activate_folio(s static void lru_gen_inc_refs(struct folio *folio) { - unsigned long new_flags, old_flags = READ_ONCE(folio->flags.f); + unsigned long new_flags, old_flags = READ_ONCE(*folio_flags(folio, 0)); + int refs; if (folio_test_unevictable(folio)) return; /* see the comment on LRU_REFS_FLAGS */ - if (!folio_test_referenced(folio)) { - set_mask_bits(&folio->flags.f, LRU_REFS_MASK, BIT(PG_referenced)); + if (!folio_lru_refs(folio)) { + folio_set_lru_refs(folio, 1); return; } do { - if ((old_flags & LRU_REFS_MASK) == LRU_REFS_MASK) { + new_flags = old_flags; + refs = lru_get_refs_flags(old_flags); + if (refs == LRU_REFS_MAX) { if (!folio_test_workingset(folio)) folio_set_workingset(folio); return; } - - new_flags = old_flags + BIT(LRU_REFS_PGOFF); - } while (!try_cmpxchg(&folio->flags.f, &old_flags, new_flags)); + lru_set_refs_flags(&new_flags, refs + 1); + } while (!try_cmpxchg(folio_flags(folio, 0), &old_flags, new_flags)); } static bool lru_gen_clear_refs(struct folio *folio) @@ -385,7 +387,8 @@ static bool lru_gen_clear_refs(struct fo if (gen < 0) return true; - set_mask_bits(&folio->flags.f, LRU_REFS_FLAGS | BIT(PG_workingset), 0); + folio_set_lru_refs(folio, 0); + folio_clear_workingset(folio); rcu_read_lock(); seq = READ_ONCE(folio_lruvec(folio)->lrugen.min_seq[type]); --- a/mm/vmscan.c~mm-mglru-introduce-helpers-for-manipulating-gen-and-refs-flags +++ a/mm/vmscan.c @@ -863,19 +863,22 @@ static bool lru_gen_set_refs(struct foli if (!folio_test_referenced(folio) && !folio_test_workingset(folio)) { /* Activate file-backed executable folios after first usage. */ if (is_exec_file_folio(folio, vma_flags)) { - set_mask_bits(&folio->flags.f, LRU_REFS_FLAGS, BIT(PG_workingset)); + folio_set_workingset(folio); + folio_set_lru_refs(folio, 0); return true; } - set_mask_bits(&folio->flags.f, LRU_REFS_MASK, BIT(PG_referenced)); + folio_set_lru_refs(folio, 1); return false; } /* Promote on second access */ - if (folio_lru_refs(folio) > 1) - set_mask_bits(&folio->flags.f, LRU_REFS_FLAGS, BIT(PG_workingset)); - else + if (folio_lru_refs(folio) > 1) { + folio_set_workingset(folio); + folio_set_lru_refs(folio, 0); + } else { folio_mark_accessed(folio); + } return true; } #else @@ -3291,11 +3294,10 @@ static bool positive_ctrl_err(struct ctr ******************************************************************************/ /* promote pages accessed through page tables */ -static int folio_update_gen(struct folio *folio, int gen, const vma_flags_t *vma_flags) +static int folio_update_gen(struct folio *folio, int new_gen, const vma_flags_t *vma_flags) { - unsigned long new_flags, old_flags = READ_ONCE(folio->flags.f); - - VM_WARN_ON_ONCE(gen >= MAX_NR_GENS); + unsigned long new_flags, old_flags = READ_ONCE(*folio_flags(folio, 0)); + int old_gen; /* * See the comment on LRU_REFS_FLAGS, and activate file-backed @@ -3304,31 +3306,34 @@ static int folio_update_gen(struct folio */ if (!folio_test_referenced(folio) && !folio_test_workingset(folio) && !is_exec_file_folio(folio, vma_flags)) { - set_mask_bits(&folio->flags.f, LRU_REFS_MASK, BIT(PG_referenced)); + folio_set_lru_refs(folio, 1); return -1; } do { + old_gen = lru_get_gen_flags(old_flags); + new_flags = old_flags; + /* lru_gen_del_folio() has isolated this page? */ - if (!(old_flags & LRU_GEN_MASK)) - return -1; + if (old_gen < 0) + break; - new_flags = old_flags & ~(LRU_GEN_MASK | LRU_REFS_FLAGS); - new_flags |= ((gen + 1UL) << LRU_GEN_PGOFF) | BIT(PG_workingset); - } while (!try_cmpxchg(&folio->flags.f, &old_flags, new_flags)); + lru_set_gen_flags(&new_flags, new_gen); + lru_set_refs_flags(&new_flags, 0); + new_flags |= BIT(PG_workingset); + } while (!try_cmpxchg(folio_flags(folio, 0), &old_flags, new_flags)); - return ((old_flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1; + return old_gen; } static int __folio_inc_gen(struct folio *folio, int old_gen, bool *increased) { - unsigned long new_flags, old_flags = READ_ONCE(folio->flags.f); + unsigned long new_flags, old_flags = READ_ONCE(*folio_flags(folio, 0)); int new_gen; - VM_WARN_ON_ONCE_FOLIO(!(old_flags & LRU_GEN_MASK), folio); - do { - new_gen = ((old_flags & LRU_GEN_MASK) >> LRU_GEN_PGOFF) - 1; + new_gen = lru_get_gen_flags(old_flags); + /* folio_update_gen() has promoted this page? */ if (new_gen >= 0 && new_gen != old_gen) { if (increased) @@ -3336,11 +3341,12 @@ static int __folio_inc_gen(struct folio return new_gen; } + new_flags = old_flags; new_gen = (old_gen + 1) % MAX_NR_GENS; - new_flags = old_flags & ~(LRU_GEN_MASK | LRU_REFS_FLAGS); - new_flags |= (new_gen + 1UL) << LRU_GEN_PGOFF; - } while (!try_cmpxchg(&folio->flags.f, &old_flags, new_flags)); + lru_set_gen_flags(&new_flags, new_gen); + lru_set_refs_flags(&new_flags, 0); + } while (!try_cmpxchg(folio_flags(folio, 0), &old_flags, new_flags)); if (increased) *increased = true; @@ -4785,7 +4791,7 @@ static bool isolate_folio(struct lruvec /* see the comment on LRU_REFS_FLAGS */ if (!folio_test_referenced(folio)) - set_mask_bits(&folio->flags.f, LRU_REFS_MASK, 0); + folio_set_lru_refs(folio, 0); success = lru_gen_del_folio(lruvec, folio, true); VM_WARN_ON_ONCE_FOLIO(!success, folio); @@ -5017,8 +5023,10 @@ retry: } /* don't add rejected folios to the oldest generation */ - if (lru_gen_folio_seq(lruvec, folio, false) == min_seq[type]) - set_mask_bits(&folio->flags.f, LRU_REFS_FLAGS, BIT(PG_active)); + if (lru_gen_folio_seq(lruvec, folio, false) == min_seq[type]) { + folio_set_lru_refs(folio, 0); + folio_set_active(folio); + } } move_folios_to_lru(&list); _ Patches currently in -mm which might be from kasong@tencent.com are