Re: [PATCH] mm: vmscan: ensure reclaiming pages on the lru lists of zone

[Hillf Danton]

On Mon, Jan 23, 2012 at 7:20 PM, Johannes Weiner <hannes@xxxxxxxxxxx> wrote:
> On Mon, Jan 23, 2012 at 12:47:34AM +0800, Hillf Danton wrote:
>> Hi all
>>
>> For easy review, it is re-prepared based on 3.3-rc1.
>>
>> Thanks
>> Hillf
>>
>> ===cut please===
>> From: Hillf Danton <dhillf@xxxxxxxxx>
>> 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. ÂNowadays, 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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