The patch titled
Subject: memcg: zap kmem_account_flags
has been added to the -mm tree. Its filename is
memcg-zap-kmem_account_flags.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/memcg-zap-kmem_account_flags.patch
echo and later at
echo http://ozlabs.org/~akpm/mmotm/broken-out/memcg-zap-kmem_account_flags.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: memcg: zap kmem_account_flags
The only such flag is KMEM_ACCOUNTED_ACTIVE, but it's set iff
mem_cgroup->kmemcg_id is initialized, so we can check kmemcg_id instead of
having a separate flags field.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 31 ++++++++++---------------------
1 file changed, 10 insertions(+), 21 deletions(-)
diff -puN mm/memcontrol.c~memcg-zap-kmem_account_flags mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-zap-kmem_account_flags
+++ a/mm/memcontrol.c
@@ -296,7 +296,6 @@ struct mem_cgroup {
* Should the accounting and control be hierarchical, per subtree?
*/
bool use_hierarchy;
- unsigned long kmem_account_flags; /* See KMEM_ACCOUNTED_*, below */
bool oom_lock;
atomic_t under_oom;
@@ -366,22 +365,11 @@ struct mem_cgroup {
/* WARNING: nodeinfo must be the last member here */
};
-/* internal only representation about the status of kmem accounting. */
-enum {
- KMEM_ACCOUNTED_ACTIVE, /* accounted by this cgroup itself */
-};
-
#ifdef CONFIG_MEMCG_KMEM
-static inline void memcg_kmem_set_active(struct mem_cgroup *memcg)
-{
- set_bit(KMEM_ACCOUNTED_ACTIVE, &memcg->kmem_account_flags);
-}
-
static bool memcg_kmem_is_active(struct mem_cgroup *memcg)
{
- return test_bit(KMEM_ACCOUNTED_ACTIVE, &memcg->kmem_account_flags);
+ return memcg->kmemcg_id >= 0;
}
-
#endif
/* Stuffs for move charges at task migration. */
@@ -3564,23 +3552,21 @@ static int memcg_activate_kmem(struct me
goto out;
}
- memcg->kmemcg_id = memcg_id;
- INIT_LIST_HEAD(&memcg->memcg_slab_caches);
-
/*
- * We couldn't have accounted to this cgroup, because it hasn't got the
- * active bit set yet, so this should succeed.
+ * We couldn't have accounted to this cgroup, because it hasn't got
+ * activated yet, so this should succeed.
*/
err = page_counter_limit(&memcg->kmem, nr_pages);
VM_BUG_ON(err);
static_key_slow_inc(&memcg_kmem_enabled_key);
/*
- * Setting the active bit after enabling static branching will
+ * A memory cgroup is considered kmem-active as soon as it gets
+ * kmemcg_id. Setting the id after enabling static branching will
* guarantee no one starts accounting before all call sites are
* patched.
*/
- memcg_kmem_set_active(memcg);
+ memcg->kmemcg_id = memcg_id;
out:
return err;
}
@@ -4252,7 +4238,6 @@ static int memcg_init_kmem(struct mem_cg
{
int ret;
- memcg->kmemcg_id = -1;
ret = memcg_propagate_kmem(memcg);
if (ret)
return ret;
@@ -4786,6 +4771,10 @@ mem_cgroup_css_alloc(struct cgroup_subsy
vmpressure_init(&memcg->vmpressure);
INIT_LIST_HEAD(&memcg->event_list);
spin_lock_init(&memcg->event_list_lock);
+#ifdef CONFIG_MEMCG_KMEM
+ memcg->kmemcg_id = -1;
+ INIT_LIST_HEAD(&memcg->memcg_slab_caches);
+#endif
return &memcg->css;
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
slab-print-slabinfo-header-in-seq-show.patch
mm-memcontrol-lockless-page-counters.patch
mm-hugetlb_cgroup-convert-to-lockless-page-counters.patch
kernel-res_counter-remove-the-unused-api.patch
kernel-res_counter-remove-the-unused-api-fix.patch
mm-memcontrol-convert-reclaim-iterator-to-simple-css-refcounting.patch
mm-memcontrol-take-a-css-reference-for-each-charged-page.patch
mm-memcontrol-remove-obsolete-kmemcg-pinning-tricks.patch
mm-memcontrol-continue-cache-reclaim-from-offlined-groups.patch
mm-memcontrol-remove-synchroneous-stock-draining-code.patch
mm-introduce-single-zone-pcplists-drain.patch
mm-page_isolation-drain-single-zone-pcplists.patch
mm-cma-drain-single-zone-pcplists.patch
mm-memory_hotplug-failure-drain-single-zone-pcplists.patch
memcg-simplify-unreclaimable-groups-handling-in-soft-limit-reclaim.patch
memcg-remove-activate_kmem_mutex.patch
mm-memcontrol-micro-optimize-mem_cgroup_split_huge_fixup.patch
mm-memcontrol-uncharge-pages-on-swapout.patch
mm-memcontrol-uncharge-pages-on-swapout-fix.patch
mm-memcontrol-remove-unnecessary-pcg_memsw-memoryswap-charge-flag.patch
mm-memcontrol-remove-unnecessary-pcg_mem-memory-charge-flag.patch
mm-memcontrol-remove-unnecessary-pcg_used-pc-mem_cgroup-valid-flag.patch
mm-memcontrol-remove-unnecessary-pcg_used-pc-mem_cgroup-valid-flag-fix.patch
mm-memcontrol-inline-memcg-move_lock-locking.patch
mm-memcontrol-dont-pass-a-null-memcg-to-mem_cgroup_end_move.patch
mm-memcontrol-fold-mem_cgroup_start_move-mem_cgroup_end_move.patch
mm-memcontrol-fold-mem_cgroup_start_move-mem_cgroup_end_move-fix.patch
memcg-remove-mem_cgroup_reclaimable-check-from-soft-reclaim.patch
memcg-use-generic-slab-iterators-for-showing-slabinfo.patch
mm-memcontrol-shorten-the-page-statistics-update-slowpath.patch
mm-memcontrol-remove-bogus-null-check-after-mem_cgroup_from_task.patch
mm-memcontrol-pull-the-null-check-from-__mem_cgroup_same_or_subtree.patch
mm-memcontrol-drop-bogus-rcu-locking-from-mem_cgroup_same_or_subtree.patch
mm-embed-the-memcg-pointer-directly-into-struct-page.patch
mm-embed-the-memcg-pointer-directly-into-struct-page-fix.patch
mm-page_cgroup-rename-file-to-mm-swap_cgroupc.patch
mm-move-page-mem_cgroup-bad-page-handling-into-generic-code.patch
mm-move-page-mem_cgroup-bad-page-handling-into-generic-code-fix.patch
mm-move-page-mem_cgroup-bad-page-handling-into-generic-code-fix-2.patch
memcg-__mem_cgroup_free-remove-stale-disarm_static_keys-comment.patch
memcg-dont-check-mm-in-__memcg_kmem_get_cachenewpage_charge.patch
memcg-do-not-abuse-memcg_kmem_skip_account.patch
memcg-zap-kmem_account_flags.patch
memcg-only-check-memcg_kmem_skip_account-in-__memcg_kmem_get_cache.patch
memcg-turn-memcg_kmem_skip_account-into-a-bit-field.patch
linux-next.patch
slab-fix-cpuset-check-in-fallback_alloc.patch
slub-fix-cpuset-check-in-get_any_partial.patch
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