linux-kernel - Re: [GIT PULL] tracing: use raw spinlocks for trace

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Message-ID: <alpine.DEB.2.00.0903111001050.16494@gandalf.stny.rr.com>
Date:	Wed, 11 Mar 2009 10:01:40 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] tracing: use raw spinlocks for trace_vprintk


On Wed, 11 Mar 2009, Steven Rostedt wrote:
> 
> The above disable is exactly for NMIs. We should have preemption disabled 
> here, and we disable this per cpu. If an NMI comes in after this point, it 
> will exit the function without taking the lock. If it runs on another CPU, 
> we really don't care. That's what NMIs are for ;-)

I have not had my first cup of coffee this morning yet. I meant to say:

  That's what spinlocks are for ;-)


Bah!

-- Steve

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