linux-kernel - Re: [PATCH] mm,x86: remove debug_pagealloc

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Message-ID: <20111118133700.GB20840@suse.de>
Date:	Fri, 18 Nov 2011 13:37:00 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	linux-mm@...ck.org, x86@...nel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] mm,x86: remove debug_pagealloc_enabled

On Wed, Nov 16, 2011 at 04:43:52PM +0100, Stanislaw Gruszka wrote:
> When (no)bootmem finish operation, it pass pages to buddy allocator.
> Since debug_pagealloc_enabled is not set, we will do not protect pages,
> what is not what we want with CONFIG_DEBUG_PAGEALLOC=y.
> 
> To fix remove debug_pagealloc_enabled. That variable was introduced by
> commit 12d6f21e "x86: do not PSE on CONFIG_DEBUG_PAGEALLOC=y" to get
> more CPA (change page attribude) code testing. But currently we have
> CONFIG_CPA_DEBUG, which test CPA.
> 
> Signed-off-by: Stanislaw Gruszka <sgruszka@...hat.com>

If no one objects to the impact on CPA testing, I see no problem with
this. I would assume that many bugs related to CPA would be rattled out
by now

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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