linux-kernel - Re: [PATCH 2/4] mm: more intensive memory corruption debug

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Message-ID: <20111114122319.GC2513@redhat.com>
Date:	Mon, 14 Nov 2011 13:23:20 +0100
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH 2/4] mm: more intensive memory corruption debug

On Fri, Nov 11, 2011 at 02:29:53PM +0000, Mel Gorman wrote:
> > --- a/mm/Kconfig.debug
> > +++ b/mm/Kconfig.debug
> > @@ -4,6 +4,7 @@ config DEBUG_PAGEALLOC
> >  	depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
> >  	depends on !KMEMCHECK
> >  	select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
> > +	select WANT_PAGE_DEBUG_FLAGS
> 
> Why not add PAGE_CORRUPT (or preferably PAGE_GUARD) in the same pattern
> as PAGE_POISONING already uses?

Additional CONFIG_PAGE_GUARD variable, would be duplicate of
CONFIG_DEBUG_PAGEALLOC. PAGE_POISONING is needed for compile
another file, no such thing would be needed with PAGE_GUARD,
hence I'm consider such variable useless.

Stanislaw
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