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| author | Ganesan Rajagopal <rganesan@arista.com> | 2022-05-13 16:48:57 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-05-13 16:48:57 -0700 |
| commit | 8e20d4b332660a32e842e20c34cfc3b3456bc6dc (patch) | |
| tree | 65fefca6acbf3bc7c2356ec37120027bb3a4c463 /Documentation/admin-guide/cgroup-v2.rst | |
| parent | 78f39084b41d287aedb2ea55f2c1895cfa11d61a (diff) | |
| download | lwn-8e20d4b332660a32e842e20c34cfc3b3456bc6dc.tar.gz lwn-8e20d4b332660a32e842e20c34cfc3b3456bc6dc.zip | |
mm/memcontrol: export memcg->watermark via sysfs for v2 memcg
We run a lot of automated tests when building our software and run into
OOM scenarios when the tests run unbounded. v1 memcg exports
memcg->watermark as "memory.max_usage_in_bytes" in sysfs. We use this
metric to heuristically limit the number of tests that can run in parallel
based on per test historical data.
This metric is currently not exported for v2 memcg and there is no other
easy way of getting this information. getrusage() syscall returns
"ru_maxrss" which can be used as an approximation but that's the max RSS
of a single child process across all children instead of the aggregated
max for all child processes. The only work around is to periodically poll
"memory.current" but that's not practical for short-lived one-off cgroups.
Hence, expose memcg->watermark as "memory.peak" for v2 memcg.
Link: https://lkml.kernel.org/r/20220507050916.GA13577@us192.sjc.aristanetworks.com
Signed-off-by: Ganesan Rajagopal <rganesan@arista.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide/cgroup-v2.rst')
| -rw-r--r-- | Documentation/admin-guide/cgroup-v2.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 19bcd73cad03..07ef3bf1448e 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -1229,6 +1229,13 @@ PAGE_SIZE multiple when read back. the target cgroup. If less bytes are reclaimed than the specified amount, -EAGAIN is returned. + memory.peak + A read-only single value file which exists on non-root + cgroups. + + The max memory usage recorded for the cgroup and its + descendants since the creation of the cgroup. + memory.oom.group A read-write single value file which exists on non-root cgroups. The default value is "0". |