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Date: Fri, 4 Jan 2013 17:05:40 +0200
From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Anton Vorontsov <anton.vorontsov@linaro.org>
Cc: David Rientjes <rientjes@google.com>, Pekka Enberg <penberg@kernel.org>,
        Mel Gorman <mgorman@suse.de>, Glauber Costa <glommer@parallels.com>,
        Michal Hocko <mhocko@suse.cz>,
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        Greg Thelen <gthelen@google.com>,
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        KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
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        linux-kernel@vger.kernel.org, linaro-kernel@lists.linaro.org,
        patches@linaro.org, kernel-team@android.com
Subject: Re: [PATCH 1/2] Add mempressure cgroup
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On Fri, Jan 04, 2013 at 12:29:11AM -0800, Anton Vorontsov wrote:
> This commit implements David Rientjes' idea of mempressure cgroup.
> 
> The main characteristics are the same to what I've tried to add to vmevent
> API; internally, it uses Mel Gorman's idea of scanned/reclaimed ratio for
> pressure index calculation. But we don't expose the index to the userland.
> Instead, there are three levels of the pressure:
> 
>  o low (just reclaiming, e.g. caches are draining);
>  o medium (allocation cost becomes high, e.g. swapping);
>  o oom (about to oom very soon).
> 
> The rationale behind exposing levels and not the raw pressure index
> described here: http://lkml.org/lkml/2012/11/16/675
> 
> For a task it is possible to be in both cpusets, memcg and mempressure
> cgroups, so by rearranging the tasks it is possible to watch a specific
> pressure (i.e. caused by cpuset and/or memcg).
> 
> Note that while this adds the cgroups support, the code is well separated
> and eventually we might add a lightweight, non-cgroups API, i.e. vmevent.
> But this is another story.
> 
> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

Acked-by: Kirill A. Shutemov <kirill@shutemov.name>

-- 
 Kirill A. Shutemov