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mm: memcg/slab: uncharge during kmem_cache_free_bulk() 

Object cgroup charging is done for all the objects during allocation, but
during freeing, uncharging ends up happening for only one object in the
case of bulk allocation/freeing.

Fix this by having a separate call to uncharge all the objects from
kmem_cache_free_bulk() and by modifying memcg_slab_free_hook() to take
care of bulk uncharging.

Fixes: 964d4bd370 ("mm: memcg/slab: save obj_cgroup for non-root slab objects"
Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Roman Gushchin <guro@fb.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20201009060423.390479-1-bharata@linux.ibm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bharata B Rao 2020-10-13 16:53:09 -07:00 committed by Linus Torvalds
parent 7a52d4d88a
commit d1b2cf6cb8
3 changed files with 30 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
mm/slab.c
View File

@ -3438,7 +3438,7 @@ void ___cache_free(struct kmem_cache *cachep, void *objp,
memset(objp, 0, cachep->object_size);
kmemleak_free_recursive(objp, cachep->flags);
objp = cache_free_debugcheck(cachep, objp, caller);
memcg_slab_free_hook(cachep, virt_to_head_page(objp), objp);
memcg_slab_free_hook(cachep, &objp, 1);
/*
* Skip calling cache_free_alien() when the platform is not numa.

42
mm/slab.h
View File

@ -345,30 +345,42 @@ static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s,
obj_cgroup_put(objcg);
}
static inline void memcg_slab_free_hook(struct kmem_cache *s, struct page *page,
void *p)
static inline void memcg_slab_free_hook(struct kmem_cache *s_orig,
void **p, int objects)
{
struct kmem_cache *s;
struct obj_cgroup *objcg;
struct page *page;
unsigned int off;
int i;
if (!memcg_kmem_enabled())
return;
if (!page_has_obj_cgroups(page))
return;
for (i = 0; i < objects; i++) {
if (unlikely(!p[i]))
continue;
off = obj_to_index(s, page, p);
objcg = page_obj_cgroups(page)[off];
page_obj_cgroups(page)[off] = NULL;
page = virt_to_head_page(p[i]);
if (!page_has_obj_cgroups(page))
continue;
if (!objcg)
return;
if (!s_orig)
s = page->slab_cache;
else
s = s_orig;
obj_cgroup_uncharge(objcg, obj_full_size(s));
mod_objcg_state(objcg, page_pgdat(page), cache_vmstat_idx(s),
-obj_full_size(s));
off = obj_to_index(s, page, p[i]);
objcg = page_obj_cgroups(page)[off];
if (!objcg)
continue;
obj_cgroup_put(objcg);
page_obj_cgroups(page)[off] = NULL;
obj_cgroup_uncharge(objcg, obj_full_size(s));
mod_objcg_state(objcg, page_pgdat(page), cache_vmstat_idx(s),
-obj_full_size(s));
obj_cgroup_put(objcg);
}
}
#else /* CONFIG_MEMCG_KMEM */
@ -406,8 +418,8 @@ static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s,
{
}
static inline void memcg_slab_free_hook(struct kmem_cache *s, struct page *page,
void *p)
static inline void memcg_slab_free_hook(struct kmem_cache *s,
void **p, int objects)
{
}
#endif /* CONFIG_MEMCG_KMEM */

3
mm/slub.c
View File

@ -3095,7 +3095,7 @@ static __always_inline void do_slab_free(struct kmem_cache *s,
struct kmem_cache_cpu *c;
unsigned long tid;
memcg_slab_free_hook(s, page, head);
memcg_slab_free_hook(s, &head, 1);
redo:
/*
* Determine the currently cpus per cpu slab.
@ -3257,6 +3257,7 @@ void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
if (WARN_ON(!size))
return;
memcg_slab_free_hook(s, p, size);
do {
struct detached_freelist df;