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Date:	Mon, 07 Feb 2011 22:20:48 -0700
From:	David Ahern <dsahern@...il.com>
To:	"J.H." <warthog9@...nel.org>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	"hpa@...nel.org" <hpa@...nel.org>, dgc@...nel.org,
	elder@...nel.org, hch@...nel.org
Subject: Re: do_raw_spin_lock using a lot of the system cpu time



On 02/07/11 17:18, J.H. wrote:

> The debugging that so far is (via perf top) claims that alloc_vmap_area,
> rb_next and do_raw_spin_lock are involved in some combination, with
> do_raw_spin_lock being the item taking up 80-90% of the time that perf
> top can see.

Have you tried 'perf record -ga' to see the various paths to
_raw_spin_lock and rb_next?

David
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