Re: [PATCH v2 05/13] mm: Move memcg stack accounting to account_kernel_stack
From: Michal Hocko <mhocko@kernel.org>
Date: 2016-06-20 13:02:51
Also in:
linux-mm, lkml
On Fri 17-06-16 13:00:41, Andy Lutomirski wrote:
We should account for stacks regardless of stack size. Move it into
account_kernel_stack.
Fixes: 12580e4b54ba8 ("mm: memcontrol: report kernel stack usage in cgroup2 memory.stat")
Cc: Vladimir Davydov <redacted>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>Acked-by: Michal Hocko <mhocko@suse.com>
quoted hunk ↗ jump to hunk
--- kernel/fork.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-)diff --git a/kernel/fork.c b/kernel/fork.c index be7f006af727..cd2abe6e4e41 100644 --- a/kernel/fork.c +++ b/kernel/fork.c@@ -165,20 +165,12 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk, struct page *page = alloc_kmem_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_info(struct thread_info *ti) { - 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); + free_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER); } # else static struct kmem_cache *thread_info_cache;@@ -227,6 +219,11 @@ static void account_kernel_stack(struct thread_info *ti, int account) mod_zone_page_state(zone, NR_KERNEL_STACK_KB, THREAD_SIZE / 1024 * account); + + /* All stack pages belong to the same memcg. */ + memcg_kmem_update_page_stat( + virt_to_page(ti), MEMCG_KERNEL_STACK, + account * (THREAD_SIZE / PAGE_SIZE)); } void free_task(struct task_struct *tsk)-- 2.5.5
-- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>