linux-kernel - Re: [PATCH v2 1/4] mm: completely disable THP by transparent

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Message-ID: <20110621115201.GD8093@tiehlicka.suse.cz>
Date:	Tue, 21 Jun 2011 13:52:02 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-doc@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 1/4] mm: completely disable THP by
 transparent_hugepage=0

On Tue 21-06-11 16:10:42, Amerigo Wang wrote:
> Introduce "transparent_hugepage=0" to totally disable THP.
> "transparent_hugepage=never" means setting THP to be partially
> disabled, we need a new way to totally disable it.

I am wondering why would you like to disable the feature on per-boot
basis. Does transparent_hugepage=never bring any measurable overhead?

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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