The patch titled
Subject: mm/memcontrol: make the slab calculation consistent
has been added to the -mm tree. Its filename is
mm-memcontrol-make-the-slab-calculation-consistent.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-make-the-slab-calculation-consistent.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-make-the-slab-calculation-consistent.patch
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------------------------------------------------------
From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: mm/memcontrol: make the slab calculation consistent
Although the ratio of the slab is one, we also should read the ratio from
the related memory_stats instead of hard-coding. And the local variable
of size is already the value of slab_unreclaimable. So we do not need to
read again. Simplify the code here.
Link: https://lkml.kernel.org/r/20201203031111.3187-1-songmuchun@xxxxxxxxxxxxx
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Roman Gushchin <guro@xxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)
--- a/mm/memcontrol.c~mm-memcontrol-make-the-slab-calculation-consistent
+++ a/mm/memcontrol.c
@@ -1612,12 +1612,22 @@ static int __init memory_stats_init(void
int i;
for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
+ switch (memory_stats[i].idx) {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- if (memory_stats[i].idx == NR_ANON_THPS ||
- memory_stats[i].idx == NR_FILE_THPS ||
- memory_stats[i].idx == NR_SHMEM_THPS)
+ case NR_ANON_THPS:
+ case NR_FILE_THPS:
+ case NR_SHMEM_THPS:
memory_stats[i].ratio = HPAGE_PMD_SIZE;
+ break;
#endif
+ case NR_SLAB_UNRECLAIMABLE_B:
+ VM_BUG_ON(i < 1);
+ VM_BUG_ON(memory_stats[i - 1].idx != NR_SLAB_RECLAIMABLE_B);
+ break;
+ default:
+ break;
+ }
+
VM_BUG_ON(!memory_stats[i].ratio);
VM_BUG_ON(memory_stats[i].idx >= MEMCG_NR_STAT);
}
@@ -1653,9 +1663,15 @@ static char *memory_stat_format(struct m
size *= memory_stats[i].ratio;
seq_buf_printf(&s, "%s %llu\n", memory_stats[i].name, size);
+ /*
+ * We are printing reclaimable, unreclaimable of the slab
+ * and the sum of both.
+ */
if (unlikely(memory_stats[i].idx == NR_SLAB_UNRECLAIMABLE_B)) {
- size = memcg_page_state(memcg, NR_SLAB_RECLAIMABLE_B) +
- memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE_B);
+ int idx = i - 1;
+
+ size += memcg_page_state(memcg, memory_stats[idx].idx) *
+ memory_stats[idx].ratio;
seq_buf_printf(&s, "slab %llu\n", size);
}
}
_
Patches currently in -mm which might be from songmuchun@xxxxxxxxxxxxx are
mm-memcontrol-remove-unused-mod_memcg_obj_state.patch
mm-memcg-slab-fix-return-child-memcg-objcg-for-root-memcg.patch
mm-memcg-slab-fix-use-after-free-in-obj_cgroup_charge.patch
mm-memcg-slab-rename-_lruvec_slab_state-to-_lruvec_kmem_state.patch
mm-memcontrol-make-the-slab-calculation-consistent.patch
mm-page_isolation-do-not-isolate-the-max-order-page.patch
