linux-kernel - Re: [PATCH] perfcounters: IRQ and NMI support on AMD CPUs

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Date:	Thu, 05 Mar 2009 20:07:56 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perfcounters: IRQ and NMI support on AMD CPUs

On Fri, 2009-03-06 at 00:26 +0530, Jaswinder Singh Rajput wrote:
> On Thu, 2009-03-05 at 19:45 +0100, Peter Zijlstra wrote:
> > On Fri, 2009-03-06 at 00:02 +0530, Jaswinder Singh Rajput wrote:
> > > 
> > > Any how with this patch on my 64 bit AMD box I am getting:
> > > 
> > > [jaswinder@...v5 perfcounters]$ ./perfstat -e 0,1,2,3 ls > /dev/null 
> > > 
> > >  Performance counter stats for 'ls':
> > > 
> > > perfstat: perfstat.c:415: main: Assertion `res == sizeof(single_count)'
> > > failed.
> > > Aborted
> > > [jaswinder@...v5 perfcounters]$ 
> > > 
> > > [root@...v5 perfcounters]# ./kerneltop 
> > > KernelTop refresh period: 2 seconds
> > > kerneltop: kerneltop.c:883: main: Assertion `res == sizeof(ip)' failed.
> > > Aborted
> > > [root@...v5 perfcounters]#
> > 
> > Ah, I think you will need a fresh copy of both utilities, Paul recently
> > changed the ABI.
> > 
> > http://people.redhat.com/mingo/perfcounters/
> > 
> > Contains the latest IIRC
> > 
> 
> With fresh copy, perfstat is working.
> 
> But kerneltop is still not working and I am not getting any NMI Interrupts.

What does your dmegs look like?

Mine read like:

[    0.012002] AMD Performance Monitoring support detected.
[    0.013002] ... num counters:    4
[    0.014001] ... value mask:      0000ffffffffffff
[    0.015001] ... fixed counters:  0
[    0.016001] ... counter mask:    000000000000000f

and its generating IRQs:

CNT:     168612     166040   Performance counter interrupts


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