linux-kernel - Re: regression caused by cgroups optimization in 3.17-rc2

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Message-ID: <20140910170506.GL25219@dhcp22.suse.cz>
Date:	Wed, 10 Sep 2014 19:05:06 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	Dave Hansen <dave@...1.net>, Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>, Tejun Heo <tj@...nel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vladimir Davydov <vdavydov@...allels.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: regression caused by cgroups optimization in 3.17-rc2

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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