linux-kernel - RE: [PATCH] Add per-process flag to control thp

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Message-Id: <20130802201301.A872BE0090@blue.fi.intel.com>
Date:	Fri,  2 Aug 2013 23:13:01 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Alex Thorlton <athorlton@....com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	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>,
	linux-kernel@...r.kernel.org
Subject: RE: [PATCH] Add per-process flag to control thp

Alex Thorlton wrote:
> This patch implements functionality to allow processes to disable the use of
> transparent hugepages through the prctl syscall.
> 
> We've determined that some jobs perform significantly better with thp disabled,
> and we need a way to control thp on a per-process basis, without relying on
> madvise.

What kind of workloads are you talking about?

What's wrong with madvise? Could you elaborate?

And I think thp_disabled should be reset to 0 on exec.

-- 
 Kirill A. Shutemov
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