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memcg: zap kmem_account_flags

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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@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov 2014-12-12 16:55:10 -08:00 committed by Linus Torvalds
parent c313dc5ded
commit 900a38f027
1 changed files with 10 additions and 21 deletions
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31
mm/memcontrol.c
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@ -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 mem_cgroup *memcg,
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_cgroup *memcg, struct cgroup_subsys *ss)
{
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_subsys_state *parent_css)
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;