linux-kernel - Re: [tip:perf/core] perf tools: Make Power7 events available for perf

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Date:	Tue, 23 Jul 2013 01:33:04 -0400 (EDT)
From:	Vince Weaver <vince@...ter.net>
To:	mingo@...nel.org, hpa@...or.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, acme@...hat.com,
	michael@...erman.id.au, runzhen@...ux.vnet.ibm.com,
	runzhew@...mson.edu, xiaoguangrong@...ux.vnet.ibm.com,
	sukadev@...ux.vnet.ibm.com, tglx@...utronix.de
cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf tools: Make Power7 events available for
 perf

On Fri, 19 Jul 2013, tip-bot for Runzhen Wang wrote:

> perf tools: Make Power7 events available for perf
> 
> This patch makes all the POWER7 events available in sysfs.  So we can
> instead specify these as:
> 
> $ size arch/powerpc/perf/power7-pmu.o
>    text	   data	    bss	    dec	    hex	filename
>    3073	   2720	      0	   5793	   16a1	arch/powerpc/perf/power7-pmu.o
> 
> and after the patch is applied, it is:
> 
> $ size arch/powerpc/perf/power7-pmu.o
>    text	   data	    bss	    dec	    hex	filename
>   15950	  31112	      0	  47062	   b7d6	arch/powerpc/perf/power7-pmu.o


so we're really going down this road?

If x86 follows this precedent we're going to end up with 300k+ of
event names in the kernel.  And as a reminder, perf_event cannot
be disabled on x86, nor can it be compiled as a module.  So that would
be 300k of event names in every kernel for everyone, even those not using 
perf.

This belongs in userspace.

Vince

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