Commit 27ee57c9 authored by Vladimir Davydov's avatar Vladimir Davydov Committed by Linus Torvalds
Browse files

mm: memcontrol: report slab usage in cgroup2 memory.stat



Show how much memory is used for storing reclaimable and unreclaimable
in-kernel data structures allocated from slab caches.
Signed-off-by: default avatarVladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 72b54e73
......@@ -843,6 +843,11 @@ PAGE_SIZE multiple when read back.
Amount of memory used to cache filesystem data,
including tmpfs and shared memory.
slab
Amount of memory used for storing in-kernel data
structures.
sock
Amount of memory used in network transmission buffers
......@@ -871,6 +876,16 @@ PAGE_SIZE multiple when read back.
on the internal memory management lists used by the
page reclaim algorithm
slab_reclaimable
Part of "slab" that might be reclaimed, such as
dentries and inodes.
slab_unreclaimable
Part of "slab" that cannot be reclaimed on memory
pressure.
pgfault
Total number of page faults incurred
......
......@@ -53,6 +53,8 @@ enum mem_cgroup_stat_index {
MEM_CGROUP_STAT_NSTATS,
/* default hierarchy stats */
MEMCG_SOCK = MEM_CGROUP_STAT_NSTATS,
MEMCG_SLAB_RECLAIMABLE,
MEMCG_SLAB_UNRECLAIMABLE,
MEMCG_NR_STAT,
};
......@@ -883,6 +885,20 @@ static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
if (memcg_kmem_enabled())
__memcg_kmem_put_cache(cachep);
}
/**
* memcg_kmem_update_page_stat - update kmem page state statistics
* @page: the page
* @idx: page state item to account
* @val: number of pages (positive or negative)
*/
static inline void memcg_kmem_update_page_stat(struct page *page,
enum mem_cgroup_stat_index idx, int val)
{
if (memcg_kmem_enabled() && page->mem_cgroup)
this_cpu_add(page->mem_cgroup->stat->count[idx], val);
}
#else
#define for_each_memcg_cache_index(_idx) \
for (; NULL; )
......@@ -928,6 +944,11 @@ memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
static inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
{
}
static inline void memcg_kmem_update_page_stat(struct page *page,
enum mem_cgroup_stat_index idx, int val)
{
}
#endif /* CONFIG_MEMCG && !CONFIG_SLOB */
#endif /* _LINUX_MEMCONTROL_H */
......@@ -5106,6 +5106,9 @@ static int memory_stat_show(struct seq_file *m, void *v)
(u64)stat[MEM_CGROUP_STAT_RSS] * PAGE_SIZE);
seq_printf(m, "file %llu\n",
(u64)stat[MEM_CGROUP_STAT_CACHE] * PAGE_SIZE);
seq_printf(m, "slab %llu\n",
(u64)(stat[MEMCG_SLAB_RECLAIMABLE] +
stat[MEMCG_SLAB_UNRECLAIMABLE]) * PAGE_SIZE);
seq_printf(m, "sock %llu\n",
(u64)stat[MEMCG_SOCK] * PAGE_SIZE);
......@@ -5126,6 +5129,11 @@ static int memory_stat_show(struct seq_file *m, void *v)
mem_cgroup_lru_names[i], (u64)val * PAGE_SIZE);
}
seq_printf(m, "slab_reclaimable %llu\n",
(u64)stat[MEMCG_SLAB_RECLAIMABLE] * PAGE_SIZE);
seq_printf(m, "slab_unreclaimable %llu\n",
(u64)stat[MEMCG_SLAB_UNRECLAIMABLE] * PAGE_SIZE);
/* Accumulated memory events */
seq_printf(m, "pgfault %lu\n",
......
......@@ -1442,9 +1442,10 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
*/
static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
{
const unsigned long nr_freed = (1 << cachep->gfporder);
int order = cachep->gfporder;
unsigned long nr_freed = (1 << order);
kmemcheck_free_shadow(page, cachep->gfporder);
kmemcheck_free_shadow(page, order);
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
sub_zone_page_state(page_zone(page),
......@@ -1461,7 +1462,8 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += nr_freed;
__free_kmem_pages(page, cachep->gfporder);
memcg_uncharge_slab(page, order, cachep);
__free_pages(page, order);
}
static void kmem_rcu_free(struct rcu_head *head)
......
......@@ -246,12 +246,33 @@ static __always_inline int memcg_charge_slab(struct page *page,
gfp_t gfp, int order,
struct kmem_cache *s)
{
int ret;
if (!memcg_kmem_enabled())
return 0;
if (is_root_cache(s))
return 0;
return __memcg_kmem_charge_memcg(page, gfp, order,
s->memcg_params.memcg);
ret = __memcg_kmem_charge_memcg(page, gfp, order,
s->memcg_params.memcg);
if (ret)
return ret;
memcg_kmem_update_page_stat(page,
(s->flags & SLAB_RECLAIM_ACCOUNT) ?
MEMCG_SLAB_RECLAIMABLE : MEMCG_SLAB_UNRECLAIMABLE,
1 << order);
return 0;
}
static __always_inline void memcg_uncharge_slab(struct page *page, int order,
struct kmem_cache *s)
{
memcg_kmem_update_page_stat(page,
(s->flags & SLAB_RECLAIM_ACCOUNT) ?
MEMCG_SLAB_RECLAIMABLE : MEMCG_SLAB_UNRECLAIMABLE,
-(1 << order));
memcg_kmem_uncharge(page, order);
}
extern void slab_init_memcg_params(struct kmem_cache *);
......@@ -294,6 +315,11 @@ static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
return 0;
}
static inline void memcg_uncharge_slab(struct page *page, int order,
struct kmem_cache *s)
{
}
static inline void slab_init_memcg_params(struct kmem_cache *s)
{
}
......
......@@ -1540,7 +1540,8 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
page_mapcount_reset(page);
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += pages;
__free_kmem_pages(page, order);
memcg_uncharge_slab(page, order, s);
__free_pages(page, order);
}
#define need_reserve_slab_rcu \
......
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