From: Zefan Li <lizefan@huawei.com> To: Michal Hocko <mhocko@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org>, Vladimir Davydov <vdavydov.dev@gmail.com>, Cgroups <cgroups@vger.kernel.org>, <linux-mm@kvack.org>, Andrew Morton <akpm@linux-foundation.org>, "Roman Gushchin" <guro@fb.com>, Shakeel Butt <shakeelb@google.com> Subject: [PATCH v2] memcg: Fix memcg_kmem_bypass() for remote memcg charging Date: Wed, 13 May 2020 19:47:49 +0800 [thread overview] Message-ID: <3a721f62-5a66-8bc5-247b-5c8b7c51c555@huawei.com> (raw) In-Reply-To: <20200513112905.GX29153@dhcp22.suse.cz> 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, it's better we fix it now. Signed-off-by: Zefan Li <lizefan@huawei.com> --- v2: add a comment as sugguested by Michal. and add changelog to explain why upstream kernel needs this fix. --- mm/memcontrol.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a3b97f1..43a12ed 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2802,6 +2802,9 @@ static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg, static inline bool memcg_kmem_bypass(void) { + /* Allow remote memcg charging in kthread contexts. */ + if (unlikely(current->active_memcg)) + return false; if (in_interrupt() || !current->mm || (current->flags & PF_KTHREAD)) return true; return false; -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Zefan Li <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> To: Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> Cc: Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, Vladimir Davydov <vdavydov.dev-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Cgroups <cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Roman Gushchin <guro-b10kYP2dOMg@public.gmane.org>, Shakeel Butt <shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org> Subject: [PATCH v2] memcg: Fix memcg_kmem_bypass() for remote memcg charging Date: Wed, 13 May 2020 19:47:49 +0800 [thread overview] Message-ID: <3a721f62-5a66-8bc5-247b-5c8b7c51c555@huawei.com> (raw) In-Reply-To: <20200513112905.GX29153-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org> 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, it's better we fix it now. Signed-off-by: Zefan Li <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> --- v2: add a comment as sugguested by Michal. and add changelog to explain why upstream kernel needs this fix. --- mm/memcontrol.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a3b97f1..43a12ed 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2802,6 +2802,9 @@ static void memcg_schedule_kmem_cache_create(struct mem_cgroup *memcg, static inline bool memcg_kmem_bypass(void) { + /* Allow remote memcg charging in kthread contexts. */ + if (unlikely(current->active_memcg)) + return false; if (in_interrupt() || !current->mm || (current->flags & PF_KTHREAD)) return true; return false; -- 2.7.4
next prev parent reply other threads:[~2020-05-13 11:48 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-13 7:28 [PATCH] memcg: Fix memcg_kmem_bypass() for remote memcg charging Zefan Li 2020-05-13 7:28 ` Zefan Li 2020-05-13 9:05 ` Michal Hocko 2020-05-13 9:05 ` Michal Hocko 2020-05-13 11:19 ` Zefan Li 2020-05-13 11:19 ` Zefan Li 2020-05-13 11:29 ` Michal Hocko 2020-05-13 11:29 ` Michal Hocko 2020-05-13 11:47 ` Zefan Li [this message] 2020-05-13 11:47 ` [PATCH v2] " Zefan Li 2020-05-13 12:22 ` Shakeel Butt 2020-05-13 12:22 ` Shakeel Butt 2020-05-13 13:05 ` Johannes Weiner 2020-05-13 13:05 ` Johannes Weiner 2020-05-13 16:11 ` Roman Gushchin 2020-05-13 16:11 ` Roman Gushchin 2020-05-14 1:16 ` Zefan Li 2020-05-14 1:16 ` Zefan Li 2020-05-14 22:52 ` Roman Gushchin 2020-05-14 22:52 ` Roman Gushchin 2020-05-15 6:56 ` Michal Hocko 2020-05-15 6:56 ` Michal Hocko 2020-05-15 8:20 ` Zefan Li 2020-05-15 8:20 ` Zefan Li 2020-05-15 8:34 ` Michal Hocko 2020-05-15 8:34 ` Michal Hocko 2020-05-15 16:22 ` Shakeel Butt 2020-05-15 16:22 ` Shakeel Butt 2020-05-15 17:31 ` Roman Gushchin 2020-05-15 17:31 ` Roman Gushchin 2020-05-18 9:13 ` Michal Hocko 2020-05-18 9:13 ` Michal Hocko 2020-05-26 1:25 ` [PATCH v3] " Zefan Li 2020-05-26 1:25 ` Zefan Li 2020-05-26 15:53 ` Roman Gushchin 2020-05-26 15:53 ` Roman Gushchin 2020-05-27 16:50 ` Shakeel Butt 2020-05-27 16:50 ` Shakeel Butt 2020-05-28 14:44 ` Michal Hocko 2020-05-28 14:44 ` Michal Hocko
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