Re: [PATCH 1/2] Add mempressure cgroup
From: Kirill A. Shutemov
Date: Fri Jan 04 2013 - 10:04:22 EST
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@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Kirill A. Shutemov
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