linux-kernel - Re: [PATCH 0/8] Re: [PATCH] Add per-process flag to control thp

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Message-ID: <20130816144742.GZ24092@twins.programming.kicks-ass.net>
Date:	Fri, 16 Aug 2013 16:47:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Thorlton <athorlton@....com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Dave Jones <davej@...hat.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Oleg Nesterov <oleg@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Kees Cook <keescook@...omium.org>, Robin Holt <holt@....com>
Subject: Re: [PATCH 0/8] Re: [PATCH] Add per-process flag to control thp

On Fri, Aug 16, 2013 at 09:33:56AM -0500, Alex Thorlton wrote:

> This first set of tests was run on the latest community kernel, with the
> vclear patches:
> 
> Kernel string: Kernel 3.11.0-rc5-medusa-00021-g1a15a96-dirty
> harp31-sys:/home/estes04/athorlton/Testing/progs/thp_benchmarks/321.equake_l# cat /sys/kernel/mm/transparent_hugepage/enabled
> [always] madvise never
> harp31-sys:/home/estes04/athorlton/Testing/progs/thp_benchmarks/321.equake_l# time ./run.sh
> ...
> Done. Terminating the simulation.
> 
> real    25m34.052s
> user    10769m7.948s
> sys     37m46.524s
> 
> harp31-sys:/home/estes04/athorlton/Testing/progs/thp_benchmarks/321.equake_l# echo never > /sys/kernel/mm/transparent_hugepage/enabled
> harp31-sys:/home/estes04/athorlton/Testing/progs/thp_benchmarks/321.equake_l# cat /sys/kernel/mm/transparent_hugepage/enabled
> always madvise [never]
> harp31-sys:/home/estes04/athorlton/Testing/progs/thp_benchmarks/321.equake_l# time ./run.sh
> ...
> Done. Terminating the simulation.
> 
> real    5m0.377s
> user    2202m0.684s
> sys     108m31.816s
> 

This 321.equake_l thing is not public, right? Do you have anything that
is public that shows the same problem?

Do you have any idea where all the extra time is spend? 
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