linux-kernel - RE: [PATCH] perf_counter: Fix a race on perf_counter

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Date:	Tue, 18 Aug 2009 14:59:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Metzger, Markus T" <markus.t.metzger@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: RE: [PATCH] perf_counter: Fix a race on perf_counter_ctx

On Tue, 2009-08-18 at 14:59 +0200, Peter Zijlstra wrote:
> On Tue, 2009-08-18 at 13:49 +0100, Metzger, Markus T wrote:
> > Hi Ingo, Peter,
> > 
> > Did you say that branch tracing is working for you?
> > 
> > On my system, the kernel hangs.
> > 
> > Could it be that it simply takes too long to copy the trace? When I set the number
> > of samples to 10, everything seems to work OK. When I increase that number to 1000,
> > the kernel is getting very slow and eventually hangs.
> > 
> > I get a message "hrtimer: interrupt too slow", and I get a soft lockup bug. The rest
> > of the message log seems pretty garbled.

How many NMI/s is this generating anyway?
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