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

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Message-ID: <20090305194127.GA2039@elte.hu>
Date:	Thu, 5 Mar 2009 20:41:27 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perfcounters: IRQ and NMI support on AMD CPUs


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Fri, 2009-03-06 at 00:26 +0530, Jaswinder Singh Rajput wrote:
> 
> > But kerneltop is still not working and I am not getting any NMI Interrupts.
> 
> Does the below work for you?
> 
> The BKGD suggests its 48 for all existing machines (it 
> certainly is for mine).

Yeah, this did the trick on AMD/Barcelona!

NMI:      11310      14932      11729      12705      11207      
13454      13378      10714      14526      11986      10973      
10765      12669      12093      13430       9661   Non-maskable 
interrupts

KernelTop works just fine:

------------------------------------------------------------------------------
 KernelTop:    1019 irqs/sec  kernel:27.9% [NMI, 1000000 CPU 
cycles],  (all, 16 CPUs)
------------------------------------------------------------------------------

             events         RIP          kernel function
  ______     ______   ________________   _______________

            5260.00 - ffffffff8037e420 : clear_page_c
            1065.00 - ffffffff805811a0 : page_fault
             699.00 - ffffffff8037e690 : copy_user_generic_string!
             669.00 - ffffffff80294ed8 : get_page_from_freelist
             575.00 - ffffffff804cd033 : acpi_pm_read
             551.00 - ffffffff8025fd1b : generic_exec_single
             416.00 - ffffffff80580c9c : _spin_lock
             413.00 - ffffffff802a32ad : unmap_vmas
             392.00 - ffffffff80580fc2 : _spin_lock_irqsave

Thanks!

	Ingo
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