linux-kernel - Re: [PATCH] mm-slab: allocate kmem_cache with __GFP

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Message-ID: <1311185224.14555.43.camel@calx>
Date:	Wed, 20 Jul 2011 13:07:04 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm-slab: allocate kmem_cache with __GFP_REPEAT

On Wed, 2011-07-20 at 20:41 +0300, Pekka Enberg wrote:
> On Wed, 20 Jul 2011, Pekka Enberg wrote:
> >> On Wed, 20 Jul 2011, Eric Dumazet wrote:
> >>>> [PATCH v2] slab: shrinks sizeof(struct kmem_cache)
> >>
> >> On Wed, 20 Jul 2011, Christoph Lameter wrote:
> >>> This will solve the issue for small nr_cpu_ids but those with 4k cpus will
> >>> still have the issue.
> >>>
> >>> Acked-by: Christoph Lameter <cl@...ux.com>
> >>
> >> Applied, thanks! Do we still want the __GFP_REPEAT patch from Konstantin
> >> though?
> 
> On Wed, 20 Jul 2011, Christoph Lameter wrote:
> > Those with 4k cpus will be thankful I guess.
> 
> OTOH, I'm slightly worried that it might mask a real problem 
> with GFP_KERNEL not being aggressive enough. Mel?

I think that's already been demonstrated here, yes. It's just waiting
for another obscure workload to trigger it.

-- 
Mathematics is the supreme nostalgia of our time.


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