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

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Message-ID: <540687B9.7070305@sr71.net>
Date:	Tue, 02 Sep 2014 20:15:05 -0700
From:	Dave Hansen <dave@...1.net>
To:	Johannes Weiner <hannes@...xchg.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Michal Hocko <mhocko@...e.com>, Hugh Dickins <hughd@...gle.com>,
	Tejun Heo <tj@...nel.org>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: regression caused by cgroups optimization in 3.17-rc2

On 09/02/2014 06:33 PM, Johannes Weiner wrote:
> kfree isn't eating 56% of "all cpu time" here, and it wasn't clear to
> me whether Dave filtered symbols from only memcontrol.o, memory.o, and
> mmap.o in a similar way.  I'm not arguing against the regression, I'm
> just trying to make sense of the numbers from the *patched* kernel.

I guess I could have included it in the description, but that was a
pretty vanilla run:

	perf top --call-graph=fp --stdio > foo.txt

I didn't use any filtering.  I didn't even know I _could_ filter. :)

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