The patch titled
Subject: memcg: Fix memcg_kmem_bypass() for remote memcg charging
has been added to the -mm tree. Its filename is
memcg-fix-memcg_kmem_bypass-for-remote-memcg-charging.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/memcg-fix-memcg_kmem_bypass-for-remote-memcg-charging.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/memcg-fix-memcg_kmem_bypass-for-remote-memcg-charging.patch
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------------------------------------------------------
From: Zefan Li <lizefan@xxxxxxxxxx>
Subject: 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.
Link: http://lkml.kernel.org/r/1d202a12-26fe-0012-ea14-f025ddcd044a@xxxxxxxxxx
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Roman Gushchin <guro@xxxxxx>
Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/mm/memcontrol.c~memcg-fix-memcg_kmem_bypass-for-remote-memcg-charging
+++ a/mm/memcontrol.c
@@ -2852,7 +2852,12 @@ static void memcg_schedule_kmem_cache_cr
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 false;
}
_
Patches currently in -mm which might be from lizefan@xxxxxxxxxx are
memcg-fix-memcg_kmem_bypass-for-remote-memcg-charging.patch
