linux-kernel - Re: [PATCH 1/5] pagewalk: only split huge pages when necessary

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Message-ID: <20110210131928.GV3347@random.random>
Date:	Thu, 10 Feb 2011 14:19:28 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael J Wolf <mjwolf@...ibm.com>
Subject: Re: [PATCH 1/5] pagewalk: only split huge pages when necessary

On Thu, Feb 10, 2011 at 11:11:25AM +0000, Mel Gorman wrote:
> Before we goto this retry, there is at a cond_resched(). Just to confirm,
> we are depending on mmap_sem to prevent khugepaged promoting this back to
> a hugepage, right? I don't see a problem with that but I want to be
> sure.

Correct, and we depend on that everywhere as wait_split_huge_page has
to run without holding spinlocks.
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