linux-kernel - Re: [PATCH -v2] mm: SLAB Out-of-memory diagnostics

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Message-ID: <20120307141836.GA2009@x61.redhat.com>
Date:	Wed, 7 Mar 2012 11:18:37 -0300
From:	Rafael Aquini <aquini@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, Rik van Riel <riel@...hat.com>,
	Josef Bacik <josef@...hat.com>
Subject: Re: [PATCH -v2] mm: SLAB Out-of-memory diagnostics

Howdy David,

On Tue, Mar 06, 2012 at 07:41:55PM -0800, David Rientjes wrote:
> > +		spin_lock_irqsave(&l3->list_lock, flags);
> 
> Could be spin_lock_irq(&l3->list_lock);

I don't think it would be safe making such assumption.

Note that spin_lock_irqsave() is used at slab_out_of_memory() because we cannot
guarantee that interrupts will be enabled/disabled by the time kmem_getpages()
is called in cache_grow() or fallback_alloc().

  Rafael
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