Re: [patch 06/11] mm: memcg: remove optimization of keeping theroot_mem_cgroup LRU lists empty

[Johannes Weiner]

On Tue, Sep 20, 2011 at 05:02:29PM +0200, Michal Hocko wrote:
> On Mon 12-09-11 12:57:23, Johannes Weiner wrote:
> > root_mem_cgroup, lacking a configurable limit, was never subject to
> > limit reclaim, so the pages charged to it could be kept off its LRU
> > lists.  They would be found on the global per-zone LRU lists upon
> > physical memory pressure and it made sense to avoid uselessly linking
> > them to both lists.
> > 
> > The global per-zone LRU lists are about to go away on memcg-enabled
> > kernels, with all pages being exclusively linked to their respective
> > per-memcg LRU lists.  As a result, pages of the root_mem_cgroup must
> > also be linked to its LRU lists again.
> 
> Nevertheless we still do not charge them so this should be mentioned
> here?

Added for the next revision:

	"This is purely about the LRU list, root_mem_cgroup is still
	not charged."
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