Re: [PATCH] slub: Fix sysfs circular locking dependency

[David Rientjes]

On Mon, 10 Jan 2011, Christoph Lameter wrote:

> New patch that just covers the slub changes.
> 
> Subject: slub: Avoid use of slub_lock in show_slab_objects()
> 
> The purpose of the locking is to prevent removal and additions
> of nodes when statistics are gathered for a slab cache. So we
> need to avoid racing with memory hotplug functionality.
> 
> It is enough to take the memory hotplug locks there instead
> of the slub_lock.
> 
> online_pages() currently does not acquire the memory_hotplug
> lock. Another patch will be submitted by the memory hotplug
> authors to take the memory hotplug lock and describe the
> uses of the memory hotplug lock to protect against
> adding and removal of nodes from non hotplug data structures.
> 
> Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>

Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
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