linux-kernel - Re: [PATCH v3] mm/slub: Run free_partial() outside of the kmem_cache_node->list

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Message-ID: <alpine.DEB.2.20.1608091121070.12004@east.gentwo.org>
Date:	Tue, 9 Aug 2016 11:21:33 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
cc:	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Safonov <dsafonov@...tuozzo.com>,
	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Gordon <david.s.gordon@...el.com>, linux-mm@...ck.org
Subject: Re: [PATCH v3] mm/slub: Run free_partial() outside of the
 kmem_cache_node->list_lock

On Tue, 9 Aug 2016, Chris Wilson wrote:

> With debugobjects enabled and using SLAB_DESTROY_BY_RCU, when a
> kmem_cache_node is destroyed the call_rcu() may trigger a slab
> allocation to fill the debug object pool (__debug_object_init:fill_pool).
> Everywhere but during kmem_cache_destroy(), discard_slab() is performed
> outside of the kmem_cache_node->list_lock and avoids a lockdep warning
> about potential recursion:

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