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mm: memcg/slab: unify SLAB and SLUB page accounting 

Currently the page accounting code is duplicated in SLAB and SLUB
internals.  Let's move it into new (un)charge_slab_page helpers in the
slab_common.c file.  These helpers will be responsible for statistics
(global and memcg-aware) and memcg charging.  So they are replacing direct
memcg_(un)charge_slab() calls.

Link: http://lkml.kernel.org/r/20190611231813.3148843-6-guro@fb.com
Signed-off-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Waiman Long <longman@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Andrei Vagin <avagin@gmail.com>
Cc: Qian Cai <cai@lca.pw>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roman Gushchin 2019-07-11 20:56:16 -07:00 committed by Linus Torvalds
parent 49a18eae2e
commit 6cea1d569d
3 changed files with 30 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
mm/slab.c
View File

@ -1360,7 +1360,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
int nodeid)
{
struct page *page;
int nr_pages;
flags |= cachep->allocflags;
@ -1370,17 +1369,11 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
return NULL;
}
if (memcg_charge_slab(page, flags, cachep->gfporder, cachep)) {
if (charge_slab_page(page, flags, cachep->gfporder, cachep)) {
__free_pages(page, cachep->gfporder);
return NULL;
}
nr_pages = (1 << cachep->gfporder);
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
mod_lruvec_page_state(page, NR_SLAB_RECLAIMABLE, nr_pages);
else
mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE, nr_pages);
__SetPageSlab(page);
/* Record if ALLOC_NO_WATERMARKS was set when allocating the slab */
if (sk_memalloc_socks() && page_is_pfmemalloc(page))
@ -1395,12 +1388,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
{
int order = cachep->gfporder;
unsigned long nr_freed = (1 << order);
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
mod_lruvec_page_state(page, NR_SLAB_RECLAIMABLE, -nr_freed);
else
mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE, -nr_freed);
BUG_ON(!PageSlab(page));
__ClearPageSlabPfmemalloc(page);
@ -1409,8 +1396,8 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
page->mapping = NULL;
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += nr_freed;
memcg_uncharge_slab(page, order, cachep);
current->reclaim_state->reclaimed_slab += 1 << order;
uncharge_slab_page(page, order, cachep);
__free_pages(page, order);
}

25
mm/slab.h
View File

@ -205,6 +205,12 @@ ssize_t slabinfo_write(struct file *file, const char __user *buffer,
void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
static inline int cache_vmstat_idx(struct kmem_cache *s)
{
return (s->flags & SLAB_RECLAIM_ACCOUNT) ?
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE;
}
#ifdef CONFIG_MEMCG_KMEM
/* List of all root caches. */
@ -361,6 +367,25 @@ static inline struct kmem_cache *virt_to_cache(const void *obj)
return page->slab_cache;
}
static __always_inline int charge_slab_page(struct page *page,
gfp_t gfp, int order,
struct kmem_cache *s)
{
int ret = memcg_charge_slab(page, gfp, order, s);
if (!ret)
mod_lruvec_page_state(page, cache_vmstat_idx(s), 1 << order);
return ret;
}
static __always_inline void uncharge_slab_page(struct page *page, int order,
struct kmem_cache *s)
{
mod_lruvec_page_state(page, cache_vmstat_idx(s), -(1 << order));
memcg_uncharge_slab(page, order, s);
}
static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
{
struct kmem_cache *cachep;

14
mm/slub.c
View File

@ -1488,7 +1488,7 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s,
else
page = __alloc_pages_node(node, flags, order);
if (page && memcg_charge_slab(page, flags, order, s)) {
if (page && charge_slab_page(page, flags, order, s)) {
__free_pages(page, order);
page = NULL;
}
@ -1681,11 +1681,6 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
if (!page)
return NULL;
mod_lruvec_page_state(page,
(s->flags & SLAB_RECLAIM_ACCOUNT) ?
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
1 << oo_order(oo));
inc_slabs_node(s, page_to_nid(page), page->objects);
return page;
@ -1719,18 +1714,13 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
check_object(s, page, p, SLUB_RED_INACTIVE);
}
mod_lruvec_page_state(page,
(s->flags & SLAB_RECLAIM_ACCOUNT) ?
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
-pages);
__ClearPageSlabPfmemalloc(page);
__ClearPageSlab(page);
page->mapping = NULL;
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += pages;
memcg_uncharge_slab(page, order, s);
uncharge_slab_page(page, order, s);
__free_pages(page, order);
}