diff options
author | Kinsey Ho <kinseyho@google.com> | 2024-02-14 06:05:37 +0000 |
---|---|---|
committer | Andrew Morton <akpm@linux-foundation.org> | 2024-02-22 10:24:58 -0800 |
commit | cc25bbe10a86a7fe3ec8468fb01e579e6216d7e1 (patch) | |
tree | f05ee2015948315e1f79aef534659f77f652a3b2 /mm/vmscan.c | |
parent | 2d823764fafa6593a87d3192c62e19eec4883d84 (diff) |
mm/mglru: improve struct lru_gen_mm_walk
Rename max_seq to seq in struct lru_gen_mm_walk to keep consistent with
struct lru_gen_mm_state. Note that seq is not always up to date with
max_seq from lru_gen_folio.
No functional changes.
Link: https://lkml.kernel.org/r/20240214060538.3524462-5-kinseyho@google.com
Signed-off-by: Kinsey Ho <kinseyho@google.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Donet Tom <donettom@linux.vnet.ibm.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r-- | mm/vmscan.c | 50 |
1 files changed, 26 insertions, 24 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 1bec586d854e..577e7f9be7c6 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2888,7 +2888,7 @@ static void reset_mm_stats(struct lru_gen_mm_walk *walk, bool last) lockdep_assert_held(&get_mm_list(lruvec_memcg(lruvec))->lock); - hist = lru_hist_from_seq(walk->max_seq); + hist = lru_hist_from_seq(walk->seq); for (i = 0; i < NR_MM_STATS; i++) { WRITE_ONCE(mm_state->stats[hist][i], @@ -2897,7 +2897,7 @@ static void reset_mm_stats(struct lru_gen_mm_walk *walk, bool last) } if (NR_HIST_GENS > 1 && last) { - hist = lru_hist_from_seq(walk->max_seq + 1); + hist = lru_hist_from_seq(walk->seq + 1); for (i = 0; i < NR_MM_STATS; i++) WRITE_ONCE(mm_state->stats[hist][i], 0); @@ -2926,9 +2926,9 @@ static bool iterate_mm_list(struct lru_gen_mm_walk *walk, struct mm_struct **ite */ spin_lock(&mm_list->lock); - VM_WARN_ON_ONCE(mm_state->seq + 1 < walk->max_seq); + VM_WARN_ON_ONCE(mm_state->seq + 1 < walk->seq); - if (walk->max_seq <= mm_state->seq) + if (walk->seq <= mm_state->seq) goto done; if (!mm_state->head) @@ -2958,7 +2958,7 @@ done: spin_unlock(&mm_list->lock); if (mm && first) - reset_bloom_filter(mm_state, walk->max_seq + 1); + reset_bloom_filter(mm_state, walk->seq + 1); if (*iter) mmput_async(*iter); @@ -2968,7 +2968,7 @@ done: return last; } -static bool iterate_mm_list_nowalk(struct lruvec *lruvec, unsigned long max_seq) +static bool iterate_mm_list_nowalk(struct lruvec *lruvec, unsigned long seq) { bool success = false; struct mem_cgroup *memcg = lruvec_memcg(lruvec); @@ -2977,9 +2977,9 @@ static bool iterate_mm_list_nowalk(struct lruvec *lruvec, unsigned long max_seq) spin_lock(&mm_list->lock); - VM_WARN_ON_ONCE(mm_state->seq + 1 < max_seq); + VM_WARN_ON_ONCE(mm_state->seq + 1 < seq); - if (max_seq > mm_state->seq) { + if (seq > mm_state->seq) { mm_state->head = NULL; mm_state->tail = NULL; WRITE_ONCE(mm_state->seq, mm_state->seq + 1); @@ -3330,7 +3330,8 @@ static bool walk_pte_range(pmd_t *pmd, unsigned long start, unsigned long end, struct lru_gen_mm_walk *walk = args->private; struct mem_cgroup *memcg = lruvec_memcg(walk->lruvec); struct pglist_data *pgdat = lruvec_pgdat(walk->lruvec); - int old_gen, new_gen = lru_gen_from_seq(walk->max_seq); + DEFINE_MAX_SEQ(walk->lruvec); + int old_gen, new_gen = lru_gen_from_seq(max_seq); pte = pte_offset_map_nolock(args->mm, pmd, start & PMD_MASK, &ptl); if (!pte) @@ -3397,7 +3398,8 @@ static void walk_pmd_range_locked(pud_t *pud, unsigned long addr, struct vm_area struct lru_gen_mm_walk *walk = args->private; struct mem_cgroup *memcg = lruvec_memcg(walk->lruvec); struct pglist_data *pgdat = lruvec_pgdat(walk->lruvec); - int old_gen, new_gen = lru_gen_from_seq(walk->max_seq); + DEFINE_MAX_SEQ(walk->lruvec); + int old_gen, new_gen = lru_gen_from_seq(max_seq); VM_WARN_ON_ONCE(pud_leaf(*pud)); @@ -3528,7 +3530,7 @@ restart: walk_pmd_range_locked(pud, addr, vma, args, bitmap, &first); } - if (!walk->force_scan && !test_bloom_filter(mm_state, walk->max_seq, pmd + i)) + if (!walk->force_scan && !test_bloom_filter(mm_state, walk->seq, pmd + i)) continue; walk->mm_stats[MM_NONLEAF_FOUND]++; @@ -3539,7 +3541,7 @@ restart: walk->mm_stats[MM_NONLEAF_ADDED]++; /* carry over to the next generation */ - update_bloom_filter(mm_state, walk->max_seq + 1, pmd + i); + update_bloom_filter(mm_state, walk->seq + 1, pmd + i); } walk_pmd_range_locked(pud, -1, vma, args, bitmap, &first); @@ -3610,7 +3612,7 @@ static void walk_mm(struct mm_struct *mm, struct lru_gen_mm_walk *walk) err = -EBUSY; /* another thread might have called inc_max_seq() */ - if (walk->max_seq != max_seq) + if (walk->seq != max_seq) break; /* folio_update_gen() requires stable folio_memcg() */ @@ -3747,7 +3749,7 @@ next: return success; } -static bool inc_max_seq(struct lruvec *lruvec, unsigned long max_seq, +static bool inc_max_seq(struct lruvec *lruvec, unsigned long seq, bool can_swap, bool force_scan) { bool success; @@ -3755,14 +3757,14 @@ static bool inc_max_seq(struct lruvec *lruvec, unsigned long max_seq, int type, zone; struct lru_gen_folio *lrugen = &lruvec->lrugen; restart: - if (max_seq < READ_ONCE(lrugen->max_seq)) + if (seq < READ_ONCE(lrugen->max_seq)) return false; spin_lock_irq(&lruvec->lru_lock); VM_WARN_ON_ONCE(!seq_is_valid(lruvec)); - success = max_seq == lrugen->max_seq; + success = seq == lrugen->max_seq; if (!success) goto unlock; @@ -3815,7 +3817,7 @@ unlock: return success; } -static bool try_to_inc_max_seq(struct lruvec *lruvec, unsigned long max_seq, +static bool try_to_inc_max_seq(struct lruvec *lruvec, unsigned long seq, bool can_swap, bool force_scan) { bool success; @@ -3824,13 +3826,13 @@ static bool try_to_inc_max_seq(struct lruvec *lruvec, unsigned long max_seq, struct lru_gen_folio *lrugen = &lruvec->lrugen; struct lru_gen_mm_state *mm_state = get_mm_state(lruvec); - VM_WARN_ON_ONCE(max_seq > READ_ONCE(lrugen->max_seq)); + VM_WARN_ON_ONCE(seq > READ_ONCE(lrugen->max_seq)); if (!mm_state) - return inc_max_seq(lruvec, max_seq, can_swap, force_scan); + return inc_max_seq(lruvec, seq, can_swap, force_scan); /* see the comment in iterate_mm_list() */ - if (max_seq <= READ_ONCE(mm_state->seq)) + if (seq <= READ_ONCE(mm_state->seq)) return false; /* @@ -3840,18 +3842,18 @@ static bool try_to_inc_max_seq(struct lruvec *lruvec, unsigned long max_seq, * is less efficient, but it avoids bursty page faults. */ if (!should_walk_mmu()) { - success = iterate_mm_list_nowalk(lruvec, max_seq); + success = iterate_mm_list_nowalk(lruvec, seq); goto done; } walk = set_mm_walk(NULL, true); if (!walk) { - success = iterate_mm_list_nowalk(lruvec, max_seq); + success = iterate_mm_list_nowalk(lruvec, seq); goto done; } walk->lruvec = lruvec; - walk->max_seq = max_seq; + walk->seq = seq; walk->can_swap = can_swap; walk->force_scan = force_scan; @@ -3862,7 +3864,7 @@ static bool try_to_inc_max_seq(struct lruvec *lruvec, unsigned long max_seq, } while (mm); done: if (success) { - success = inc_max_seq(lruvec, max_seq, can_swap, force_scan); + success = inc_max_seq(lruvec, seq, can_swap, force_scan); WARN_ON_ONCE(!success); } |