Commit 50d53d7c authored by Zefan Li's avatar Zefan Li Committed by Linus Torvalds

memcg: fix memcg_kmem_bypass() for remote memcg charging

While trying to use remote memcg charging in an out-of-tree kernel
module I found it's not working, because the current thread is a
workqueue thread.

As we will probably encounter this issue in the future as the users of
memalloc_use_memcg() grow, and it's nothing wrong for this usage, it's
better we fix it now.
Signed-off-by: default avatarZefan Li <lizefan@huawei.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarRoman Gushchin <guro@fb.com>
Reviewed-by: default avatarShakeel Butt <shakeelb@google.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Link: http://lkml.kernel.org/r/1d202a12-26fe-0012-ea14-f025ddcd044a@huawei.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4b82ab4f
...@@ -2852,7 +2852,12 @@ static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg, ...@@ -2852,7 +2852,12 @@ static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg,
static inline bool memcg_kmem_bypass(void) static inline bool memcg_kmem_bypass(void)
{ {
if (in_interrupt() || !current->mm || (current->flags & PF_KTHREAD)) if (in_interrupt())
return true;
/* Allow remote memcg charging in kthread contexts. */
if ((!current->mm || (current->flags & PF_KTHREAD)) &&
!current->active_memcg)
return true; return true;
return false; return false;
} }
......
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