On Mon, Jan 23, 2012 at 7:20 PM, Johannes Weiner [off-list ref] wrote:

On Mon, Jan 23, 2012 at 12:47:34AM +0800, Hillf Danton wrote:

quoted

Hi all

For easy review, it is re-prepared based on 3.3-rc1.

Thanks
Hillf

===cut please===
From: Hillf Danton <redacted>
Subject: [PATCH] mm: vmscan: ensure reclaiming pages on the lru lists of zone

While iterating over memory cgroup hierarchy, pages are reclaimed from each
mem cgroup, and reclaim terminates after a full round-trip. It is possible
that no pages on the lru lists of given zone are reclaimed, as termination
is checked after the reclaiming function.

Mem cgroup iteration is rearranged a bit to make sure that pages are reclaimed
from both mem cgroups and zone.

It's not only possible, it's guaranteed: with the memory controller
enabled, the global per-zone lru lists are empty.

Pages used to be linked on the global per-zone AND the memcg per-zone
lru lists.  Nowadays, they only sit on the memcg per-zone lists, which
is why global reclaim does a hierarchy walk.

Thanks for getting me up to date 8-)
Hillf

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