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Date: Wed, 10 Sep 2014 19:05:06 +0200
From: Michal Hocko <mhocko@suse.cz>
Subject: Re: regression caused by cgroups optimization in 3.17-rc2
Message-ID: <20140910170506.GL25219@dhcp22.suse.cz>
References: <54061505.8020500@sr71.net>
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To: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave@sr71.net>, Johannes Weiner <hannes@cmpxchg.org>, Hugh Dickins <hughd@google.com>, Tejun Heo <tj@kernel.org>, Linux-MM <linux-mm@kvack.org>, Andrew Morton <akpm@linux-foundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, Vladimir Davydov <vdavydov@parallels.com>, LKML <linux-kernel@vger.kernel.org>

On Wed 10-09-14 09:57:56, Dave Hansen wrote:
> On 09/10/2014 09:29 AM, Michal Hocko wrote:
> > I do not have a bigger machine to play with unfortunately. I think the
> > patch makes sense on its own. I would really appreciate if you could
> > give it a try on your machine with !root memcg case to see how much it
> > helped. I would expect similar results to your previous testing without
> > the revert and Johannes' patch.
> 
> So you want to see before/after this patch:
> 
> Subject: [PATCH] mm, memcg: Do not kill release batching in
>  free_pages_and_swap_cache
> 
> And you want it on top of a kernel with the revert or without?

Revert doesn't make any difference if you run the load inside a memcg
(without any limit set).
So just before and after the patch would be sufficient.

Thanks a lot Dave!
-- 
Michal Hocko
SUSE Labs

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