Date: Thu, 10 Feb 2011 14:19:28 +0100
From: Andrea Arcangeli <aarcange@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Michael J Wolf <mjwolf@us.ibm.com>
Subject: Re: [PATCH 1/5] pagewalk: only split huge pages when necessary
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References: <20110209195406.B9F23C9F@kernel>
 <20110209195407.2CE28EA0@kernel>
 <20110210111125.GC17873@csn.ul.ie>
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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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