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

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Message-ID: <alpine.DEB.2.00.1106211814250.5205@chino.kir.corp.google.com>
Date:	Tue, 21 Jun 2011 18:16:35 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Amerigo Wang <amwang@...hat.com>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <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 Jun 2011, 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.
> 

Why can't you just compile it off so you never even compile 
mm/huge_memory.c in the first place and save the space in the kernel image 
as well?  Having the interface available to enable the feature at runtime 
is worth the savings this patch provides, in my opinion.
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