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memcg: clarify use_hierarchy documentation

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The memcg code does not allow changing memory.use_hierarchy if the
parent cgroup has enabled use_hierarchy.  Update documentation to match
the code.

Signed-off-by: Greg Thelen <gthelen@google.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Greg Thelen 2011-02-16 17:51:23 -08:00 committed by Jiri Kosina
parent c23cf8baf6
commit 689bca3bbc
1 changed files with 3 additions and 2 deletions
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5
Documentation/cgroups/memory.txt
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@ -485,8 +485,9 @@ The feature can be disabled by
# echo 0 > memory.use_hierarchy
NOTE1: Enabling/disabling will fail if the cgroup already has other
cgroups created below it.
NOTE1: Enabling/disabling will fail if either the cgroup already has other
cgroups created below it, or if the parent cgroup has use_hierarchy
enabled.
NOTE2: When panic_on_oom is set to "2", the whole system will panic in
case of an OOM event in any cgroup.