summaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
authorRoman Gushchin <guro@fb.com>2020-10-18 02:13:53 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-18 19:27:09 +0300
commit4127c6504f25c4fcff52dc996efda2ef859dd661 (patch)
tree1b8a30f5ac74b6405fbd14f184967cfaaaac9328 /mm
parent37d5985c003daab138a72dd4af9853b396d91c26 (diff)
downloadlinux-4127c6504f25c4fcff52dc996efda2ef859dd661.tar.xz
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.c13
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.
*/