Under memory pressure reclaim and oom would happen,
with multiple cgroups exist in one system, we might
want some of their memory or tasks survived the
reclaim and oom while there are other cadidates.
When oom happens it always choose victim from low
priority memcg. And it works both for memcg oom and
global oom, it can be enabled/disabled through
@memory.use_priority_oom, for global oom through the root
memcg's @memory.use_priority_oom, it is disabled by default.
Signed-off-by: Haiwei Li <gerryhwli@tencent.com>
Signed-off-by: Mengmeng Chen <bauerchen@tencent.com>
Signed-off-by: Xiaoguang Chen <xiaoggchen@tencent.com>
Signed-off-by: Honglin Li <honglinli@tencent.com>
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