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mm: memcontrol: give the kmem states more descriptive names

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On any given memcg, the kmem accounting feature has three separate
states: not initialized, structures allocated, and actively accounting
slab memory.  These are represented through a combination of the
kmem_acct_activated and kmem_acct_active flags, which is confusing.

Convert to a kmem_state enum with the states NONE, ALLOCATED, and
ONLINE.  Then rename the functions to modify the state accordingly.
This follows the nomenclature of css object states more closely.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner
2016-01-20 15:02:24 -08:00
committed by Linus Torvalds
parent b15aac110a
commit 567e9ab2e6
4 changed files with 38 additions and 35 deletions
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15
include/linux/memcontrol.h
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@@ -152,6 +152,12 @@ struct mem_cgroup_thresholds {
struct mem_cgroup_threshold_ary *spare;
};
enum memcg_kmem_state {
KMEM_NONE,
KMEM_ALLOCATED,
KMEM_ONLINE,
};
/*
* The memory controller data structure. The memory controller controls both
* page cache and RSS per cgroup. We would eventually like to provide
@@ -233,8 +239,7 @@ struct mem_cgroup {
#if defined(CONFIG_MEMCG_KMEM)
/* Index in the kmem_cache->memcg_params.memcg_caches array */
int kmemcg_id;
bool kmem_acct_activated;
bool kmem_acct_active;
enum memcg_kmem_state kmem_state;
#endif
int last_scanned_node;
@@ -750,9 +755,9 @@ static inline bool memcg_kmem_enabled(void)
return static_branch_unlikely(&memcg_kmem_enabled_key);
}
static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
static inline bool memcg_kmem_online(struct mem_cgroup *memcg)
{
return memcg->kmem_acct_active;
return memcg->kmem_state == KMEM_ONLINE;
}
/*
@@ -850,7 +855,7 @@ static inline bool memcg_kmem_enabled(void)
return false;
}
static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
static inline bool memcg_kmem_online(struct mem_cgroup *memcg)
{
return false;
}