linux-kernel - Re: spin_is_locked() broken for uniprocessor?

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Date:	Wed, 19 Aug 2009 13:23:13 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Leon Woestenberg <leon.woestenberg@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Howells <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Kumar Gala <galak@...nel.crashing.org>,
	Linux-Kernel List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: spin_is_locked() broken for uniprocessor?

On Wed, 2009-08-19 at 13:16 +0200, Leon Woestenberg wrote:
> Hello,
> 
> On Wed, Aug 19, 2009 at 12:53 PM, Alan Cox<alan@...rguk.ukuu.org.uk> wrote:
> > On Wed, 19 Aug 2009 10:38:06 +0100
> >
> > in drivers because there is driver code that uses spin_is_locked() in
> > fairly sensible fashion when dealing with locking.
> >
> One use is to measure lock contention hits on a particular spin lock.
> 
> 
> However I wonder if there are tracing capabilities to measure lock
> contention on a particular lock?

lock_stat no good for you?
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