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mm: fix memcg stack accounting for sub-page stacks

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We should account for stacks regardless of stack size, and we need to
account in sub-page units if THREAD_SIZE < PAGE_SIZE.  Change the units
to kilobytes and Move it into account_kernel_stack().

Fixes: 12580e4b54 ("mm: memcontrol: report kernel stack usage in cgroup2 memory.stat")
Link: http://lkml.kernel.org/r/9b5314e3ee5eda61b0317ec1563768602c1ef438.1468523549.git.luto@kernel.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Lutomirski 2016-07-28 15:48:17 -07:00 • committed by Linus Torvalds
parent d30dd8be06
commit efdc949079
3 changed files with 10 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

19
kernel/fork.c
View file

@ -165,20 +165,12 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk,
struct page *page = alloc_pages_node(node, THREADINFO_GFP,
THREAD_SIZE_ORDER);
if (page)
memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
1 << THREAD_SIZE_ORDER);
return page ? page_address(page) : NULL;
}
static inline void free_thread_stack(unsigned long *stack)
{
struct page *page = virt_to_page(stack);
memcg_kmem_update_page_stat(page, MEMCG_KERNEL_STACK,
-(1 << THREAD_SIZE_ORDER));
__free_pages(page, THREAD_SIZE_ORDER);
__free_pages(virt_to_page(stack), THREAD_SIZE_ORDER);
}
# else
static struct kmem_cache *thread_stack_cache;
@ -223,10 +215,15 @@ static struct kmem_cache *mm_cachep;
static void account_kernel_stack(unsigned long *stack, int account)
{
struct zone *zone = page_zone(virt_to_page(stack));
/* All stack pages are in the same zone and belong to the same memcg. */
struct page *first_page = virt_to_page(stack);
mod_zone_page_state(zone, NR_KERNEL_STACK_KB,
mod_zone_page_state(page_zone(first_page), NR_KERNEL_STACK_KB,
THREAD_SIZE / 1024 * account);
memcg_kmem_update_page_stat(
first_page, MEMCG_KERNEL_STACK_KB,
account * (THREAD_SIZE / 1024));
}
void free_task(struct task_struct *tsk)