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Before sockets became aware of net-memcg's memory pressure since
commit e1aab161e0 ("socket: initial cgroup code."), the memory
usage would be granted to raise if below average even when under
protocol's pressure. This provides fairness among the sockets of
same protocol.
That commit changes this because the heuristic will also be
effective when only memcg is under pressure which makes no sense.
So revert that behavior.
After reverting, __sk_mem_raise_allocated() no longer considers
memcg's pressure. As memcgs are isolated from each other w.r.t.
memory accounting, consuming one's budget won't affect others.
So except the places where buffer sizes are needed to be tuned,
allow workloads to use the memory they are provisioned.
Signed-off-by: Abel Wu <wuyun.abel@bytedance.com>
Acked-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20231019120026.42215-3-wuyun.abel@bytedance.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
66e6369e31