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mm: memcontrol: report kernel stack usage in cgroup2 memory.stat 

Show how much memory is allocated to kernel stacks.

Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
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 2016-03-17 14:17:38 -07:00 committed by Linus Torvalds
parent 27ee57c93f
commit 12580e4b54
4 changed files with 17 additions and 2 deletions
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4
Documentation/cgroup-v2.txt
View File

@ -843,6 +843,10 @@ PAGE_SIZE multiple when read back.
Amount of memory used to cache filesystem data, Amount of memory used to cache filesystem data,
including tmpfs and shared memory. including tmpfs and shared memory.
kernel_stack
Amount of memory allocated to kernel stacks.
slab slab
Amount of memory used for storing in-kernel data Amount of memory used for storing in-kernel data

3
include/linux/memcontrol.h
View File

@ -52,9 +52,10 @@ enum mem_cgroup_stat_index {
MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */ MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
MEM_CGROUP_STAT_NSTATS, MEM_CGROUP_STAT_NSTATS,
/* default hierarchy stats */ /* default hierarchy stats */
MEMCG_SOCK = MEM_CGROUP_STAT_NSTATS, MEMCG_KERNEL_STACK = MEM_CGROUP_STAT_NSTATS,
MEMCG_SLAB_RECLAIMABLE, MEMCG_SLAB_RECLAIMABLE,
MEMCG_SLAB_UNRECLAIMABLE, MEMCG_SLAB_UNRECLAIMABLE,
MEMCG_SOCK,
MEMCG_NR_STAT, MEMCG_NR_STAT,
}; };

10
kernel/fork.c
View File

@ -164,12 +164,20 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
struct page *page = alloc_kmem_pages_node(node, THREADINFO_GFP, struct page *page = alloc_kmem_pages_node(node, THREADINFO_GFP,
THREAD_SIZE_ORDER); THREAD_SIZE_ORDER);
if (page)
memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
1 << THREAD_SIZE_ORDER);
return page ? page_address(page) : NULL; return page ? page_address(page) : NULL;
} }
static inline void free_thread_info(struct thread_info *ti) static inline void free_thread_info(struct thread_info *ti)
{ {
free_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER); struct page *page = virt_to_page(ti);
memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
-(1 << THREAD_SIZE_ORDER));
__free_kmem_pages(page, THREAD_SIZE_ORDER);
} }
# else # else
static struct kmem_cache *thread_info_cache; static struct kmem_cache *thread_info_cache;

2
mm/memcontrol.c
View File

@ -5106,6 +5106,8 @@ static int memory_stat_show(struct seq_file *m, void *v)
(u64)stat[MEM_CGROUP_STAT_RSS] * PAGE_SIZE); (u64)stat[MEM_CGROUP_STAT_RSS] * PAGE_SIZE);
seq_printf(m, "file %llu\n", seq_printf(m, "file %llu\n",
(u64)stat[MEM_CGROUP_STAT_CACHE] * PAGE_SIZE); (u64)stat[MEM_CGROUP_STAT_CACHE] * PAGE_SIZE);
seq_printf(m, "kernel_stack %llu\n",
(u64)stat[MEMCG_KERNEL_STACK] * PAGE_SIZE);
seq_printf(m, "slab %llu\n", seq_printf(m, "slab %llu\n",
(u64)(stat[MEMCG_SLAB_RECLAIMABLE] + (u64)(stat[MEMCG_SLAB_RECLAIMABLE] +
stat[MEMCG_SLAB_UNRECLAIMABLE]) * PAGE_SIZE); stat[MEMCG_SLAB_UNRECLAIMABLE]) * PAGE_SIZE);