linux-kernel - Re: [PATCH] slab: fix the DEADLOCK issue on l3 alien lock

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Message-ID: <0000013996b6f21d-d45be653-3111-4aef-b079-31dc673e6fd8-000000@email.amazonses.com>
Date:	Wed, 5 Sep 2012 13:55:35 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Matt Mackall <mpm@...enic.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH] slab: fix the DEADLOCK issue on l3 alien lock

On Wed, 5 Sep 2012, Michael Wang wrote:

> Since the cachep and cachep->slabp_cache's l3 alien are in the same lock class,
> fake report generated.

Ahh... That is a key insight into why this occurs.

> This should not happen since we already have init_lock_keys() which will
> reassign the lock class for both l3 list and l3 alien.

Right. I was wondering why we still get intermitted reports on this.

> This patch will invoke init_lock_keys() after we done enable_cpucache()
> instead of before to avoid the fake DEADLOCK report.

Acked-by: Christoph Lameter <cl@...ux.com>
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