netdev - Re: [PATCH] slub: Make CONFIG_PAGE_ALLOC work with new fastpath

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Message-ID: <1305322002.3120.11.camel@edumazet-laptop>
Date:	Fri, 13 May 2011 23:26:42 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Vegard Nossum <vegardno@....uio.no>,
	Pekka Enberg <penberg@...helsinki.fi>,
	casteyde.christian@...e.fr,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [PATCH] slub: Make CONFIG_PAGE_ALLOC work with new fastpath

Le vendredi 13 mai 2011 à 16:15 -0500, Christoph Lameter a écrit :
> I ran this with hackbench under KVM with CONFIG_DEBUG_PAGEALLOC and I saw
> no failures.
> 
> 
> Subject: slub: Make CONFIG_PAGE_ALLOC work with new fastpath
> 
> Fastpath can do a speculative access to a page that CONFIG_PAGE_ALLOC may have
> marked as invalid to retrieve the pointer to the next free object.
> 
> Use probe_kernel_read in that case in order not to cause a page fault.
> 
> Signed-off-by: Christoph Lameter <cl@...ux.com>

Reported-by: Eric Dumazet <eric.dumazet@...il.com>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>

Thanks !


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