Re: [patch] mm: memcontrol: remove hierarchy restrictions for swappiness and oom_control

[Andrew Morton <akpm@linux-foundation.org>]

On Wed, 16 Apr 2014 17:13:18 -0400 Johannes Weiner <hannes@cmpxchg.org> wrote:

> Per-memcg swappiness and oom killing can currently not be tweaked on a
> memcg that is part of a hierarchy, but not the root of that hierarchy.
> Users have complained that they can't configure this when they turned
> on hierarchy mode.  In fact, with hierarchy mode becoming the default,
> this restriction disables the tunables entirely.
> 
> But there is no good reason for this restriction.  The settings for
> swappiness and OOM killing are taken from whatever memcg whose limit
> triggered reclaim and OOM invocation, regardless of its position in
> the hierarchy tree.
> 
> Allow setting swappiness on any group.  The knob on the root memcg
> already reads the global VM swappiness, make it writable as well.
> 
> Allow disabling the OOM killer on any non-root memcg.

Documentation/cgroups/memory.txt needs updates?

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