linux-kernel - Re: [PATCH 5/5] x86, nmi: Add better NMI stats to /proc/interrupts and show handlers

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Date:	Wed, 7 May 2014 17:42:31 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	x86@...nel.org, Peter Zijlstra <peterz@...radead.org>,
	ak@...ux.intel.com, gong.chen@...ux.intel.com,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 5/5] x86, nmi: Add better NMI stats to /proc/interrupts
 and show handlers


* Don Zickus <dzickus@...hat.com> wrote:

> The main reason for this patch is because I have a hard time knowing
> what NMI handlers are registered on the system when debugging NMI issues.
> 
> This info is provided in /proc/interrupts for interrupt handlers, so I
> added support for NMI stuff too.  As a bonus it provides stat breakdowns
> much like the interrupts.
> 
> The only ugly issue is how to label NMI subtypes using only 3 letters
> and still make it obvious it is part of the NMI.  Adding a /proc/nmi
> seemed overkill, so I choose to indent things by one space.  Sample
> output is below:
> 
> [root@...p71-248 ~]# cat /proc/interrupts
>            CPU0       CPU1       CPU2       CPU3
>   0:         29          0          0          0  IR-IO-APIC-edge      timer
> <snip>
> NMI:         20        774      10986       4227   Non-maskable interrupts
>  LOC:         21        775      10987       4228  Local     PMI, arch_bt
>  EXT:          0          0          0          0  External  plat
>  UNK:          0          0          0          0  Unknown
>  SWA:          0          0          0          0  Swallowed
> LOC:      30374      24749      20795      15095   Local timer interrupts
> SPU:          0          0          0          0   Spurious interrupts
> PMI:         20        774      10986       4227   Performance monitoring interrupts
> <snip>

Looks pretty useful!

The lost vertical alignment of the counts is a problem though IMHO.

Thanks,

	Ingo
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