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| author | Roman Gushchin <guro@fb.com> | 2020-10-17 16:13:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-18 09:27:09 -0700 |
| commit | 4127c6504f25c4fcff52dc996efda2ef859dd661 (patch) | |
| tree | 1b8a30f5ac74b6405fbd14f184967cfaaaac9328 /mm | |
| parent | 37d5985c003daab138a72dd4af9853b396d91c26 (diff) | |
| download | linux-4127c6504f25c4fcff52dc996efda2ef859dd661.tar.gz linux-4127c6504f25c4fcff52dc996efda2ef859dd661.tar.bz2 linux-4127c6504f25c4fcff52dc996efda2ef859dd661.zip | |
mm: kmem: enable kernel memcg accounting from interrupt contexts
If a memcg to charge can be determined (using remote charging API), there
are no reasons to exclude allocations made from an interrupt context from
the accounting.
Such allocations will pass even if the resulting memcg size will exceed
the hard limit, but it will affect the application of the memory pressure
and an inability to put the workload under the limit will eventually
trigger the OOM.
To use active_memcg() helper, memcg_kmem_bypass() is moved back to
memcontrol.c.
Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Link: http://lkml.kernel.org/r/20200827225843.1270629-5-guro@fb.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memcontrol.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a3318b66e41e..3a24e3b619f5 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1090,6 +1090,19 @@ static __always_inline struct mem_cgroup *get_active_memcg(void) return memcg; } +static __always_inline bool memcg_kmem_bypass(void) +{ + /* Allow remote memcg charging from any context. */ + if (unlikely(active_memcg())) + return false; + + /* Memcg to charge can't be determined. */ + if (in_interrupt() || !current->mm || (current->flags & PF_KTHREAD)) + return true; + + return false; +} + /** * If active memcg is set, do not fallback to current->mm->memcg. */ |