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| author | Vladimir Davydov <vdavydov@virtuozzo.com> | 2015-12-11 13:40:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-12-12 10:15:34 -0800 |
| commit | 9516a18a9a253a94292e74f11f92083126c5a237 (patch) | |
| tree | 4c8cf1212ce7cea038deaf01a82e7b09efc67ebd /net/ceph/auth_none.c | |
| parent | a88c769548047b21f76fd71e04b6a3300ff17160 (diff) | |
| download | op-kernel-dev-9516a18a9a253a94292e74f11f92083126c5a237.zip op-kernel-dev-9516a18a9a253a94292e74f11f92083126c5a237.tar.gz | |
memcg: fix memory.high target
When the memory.high threshold is exceeded, try_charge() schedules a
task_work to reclaim the excess. The reclaim target is set to the
number of pages requested by try_charge().
This is wrong, because try_charge() usually charges more pages than
requested (batch > nr_pages) in order to refill per cpu stocks. As a
result, a process in a cgroup can easily exceed memory.high
significantly when doing a lot of charges w/o returning to userspace
(e.g. reading a file in big chunks).
Fix this issue by assuring that when exceeding memory.high a process
reclaims as many pages as were actually charged (i.e. batch).
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/ceph/auth_none.c')
0 files changed, 0 insertions, 0 deletions
