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slab: add SLAB_ACCOUNT flag

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Currently, if we want to account all objects of a particular kmem cache,
we have to pass __GFP_ACCOUNT to each kmem_cache_alloc call, which is
inconvenient.  This patch introduces SLAB_ACCOUNT flag which if passed
to kmem_cache_create will force accounting for every allocation from
this cache even if __GFP_ACCOUNT is not passed.

This patch does not make any of the existing caches use this flag - it
will be done later in the series.

Note, a cache with SLAB_ACCOUNT cannot be merged with a cache w/o
SLAB_ACCOUNT, because merged caches share the same kmem_cache struct and
hence cannot have different sets of SLAB_* flags.  Thus using this flag
will probably reduce the number of merged slabs even if kmem accounting
is not used (only compiled in).

Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Suggested-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
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 2016-01-14 15:18:15 -08:00 committed by Linus Torvalds
parent a9bb7e620e
commit 230e9fc286
6 changed files with 26 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
include/linux/memcontrol.h
View File

@ -766,15 +766,13 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg)
return memcg ? memcg->kmemcg_id : -1;
}
struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep);
struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
void __memcg_kmem_put_cache(struct kmem_cache *cachep);
static inline bool __memcg_kmem_bypass(gfp_t gfp)
static inline bool __memcg_kmem_bypass(void)
{
if (!memcg_kmem_enabled())
return true;
if (!(gfp & __GFP_ACCOUNT))
return true;
if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
return true;
return false;
@ -791,7 +789,9 @@ static inline bool __memcg_kmem_bypass(gfp_t gfp)
static __always_inline int memcg_kmem_charge(struct page *page,
gfp_t gfp, int order)
{
if (__memcg_kmem_bypass(gfp))
if (__memcg_kmem_bypass())
return 0;
if (!(gfp & __GFP_ACCOUNT))
return 0;
return __memcg_kmem_charge(page, gfp, order);
}
@ -810,16 +810,15 @@ static __always_inline void memcg_kmem_uncharge(struct page *page, int order)
/**
* memcg_kmem_get_cache: selects the correct per-memcg cache for allocation
* @cachep: the original global kmem cache
* @gfp: allocation flags.
*
* All memory allocated from a per-memcg cache is charged to the owner memcg.
*/
static __always_inline struct kmem_cache *
memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
{
if (__memcg_kmem_bypass(gfp))
if (__memcg_kmem_bypass())
return cachep;
return __memcg_kmem_get_cache(cachep);
return __memcg_kmem_get_cache(cachep, gfp);
}
static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep)

5
include/linux/slab.h
View File

@ -86,6 +86,11 @@
#else
# define SLAB_FAILSLAB 0x00000000UL
#endif
#ifdef CONFIG_MEMCG_KMEM
# define SLAB_ACCOUNT 0x04000000UL /* Account to memcg */
#else
# define SLAB_ACCOUNT 0x00000000UL
#endif
/* The following flags affect the page allocator grouping pages by mobility */
#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */

8
mm/memcontrol.c
View File

@ -2356,7 +2356,7 @@ static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg,
* Can't be called in interrupt context or from kernel threads.
* This function needs to be called with rcu_read_lock() held.
*/
struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep)
struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
{
struct mem_cgroup *memcg;
struct kmem_cache *memcg_cachep;
@ -2364,6 +2364,12 @@ struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep)
VM_BUG_ON(!is_root_cache(cachep));
if (cachep->flags & SLAB_ACCOUNT)
gfp |= __GFP_ACCOUNT;
if (!(gfp & __GFP_ACCOUNT))
return cachep;
if (current->memcg_kmem_skip_account)
return cachep;

5
mm/slab.h
View File

@ -128,10 +128,11 @@ static inline unsigned long kmem_cache_flags(unsigned long object_size,
#if defined(CONFIG_SLAB)
#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | SLAB_NOTRACK)
SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
SLAB_NOTRACK | SLAB_ACCOUNT)
#elif defined(CONFIG_SLUB)
#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
SLAB_TEMPORARY | SLAB_NOTRACK)
SLAB_TEMPORARY | SLAB_NOTRACK | SLAB_ACCOUNT)
#else
#define SLAB_CACHE_FLAGS (0)
#endif

3
mm/slab_common.c
View File

@ -37,7 +37,8 @@ struct kmem_cache *kmem_cache;
SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE | \
SLAB_FAILSLAB)
#define SLAB_MERGE_SAME (SLAB_RECLAIM_ACCOUNT | SLAB_CACHE_DMA | SLAB_NOTRACK)
#define SLAB_MERGE_SAME (SLAB_RECLAIM_ACCOUNT | SLAB_CACHE_DMA | \
SLAB_NOTRACK | SLAB_ACCOUNT)
/*
* Merge control. If this is set then no merging of slab caches will occur.

2
mm/slub.c
View File

@ -5362,6 +5362,8 @@ static char *create_unique_id(struct kmem_cache *s)
*p++ = 'F';
if (!(s->flags & SLAB_NOTRACK))
*p++ = 't';
if (s->flags & SLAB_ACCOUNT)
*p++ = 'A';
if (p != name + 1)
*p++ = '-';
p += sprintf(p, "%07d", s->size);