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From: Vince Weaver <vince@deater.net>
To: mingo@kernel.org, hpa@zytor.com, paulus@samba.org,
	linux-kernel@vger.kernel.org, acme@redhat.com,
	michael@ellerman.id.au, runzhen@linux.vnet.ibm.com,
	runzhew@clemson.edu, xiaoguangrong@linux.vnet.ibm.com,
	sukadev@linux.vnet.ibm.com, tglx@linutronix.de
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:perf/core] perf tools: Make Power7 events available for perf
Date: Tue, 23 Jul 2013 01:33:04 -0400 (EDT)	[thread overview]
Message-ID: <alpine.DEB.2.02.1307230129350.18266@pianoman.cluster.toy> (raw)
In-Reply-To: <tip-cfe0d8ba14a1d98245b371e486c68f37eba1ca52@git.kernel.org>

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


  reply	other threads:[~2013-07-23  5:32 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-28  8:14 [PATCH v3 0/2] perf tools: Power7 events name available for perf Runzhen Wang
2013-06-28  8:14 ` Runzhen Wang
2013-06-28  8:14 ` [PATCH v3 1/2] perf tools: fix a typo of a Power7 event name Runzhen Wang
2013-06-28  8:14   ` Runzhen Wang
2013-07-12  8:51   ` [tip:perf/urgent] " tip-bot for Runzhen Wang
2013-06-28  8:14 ` [PATCH v3 2/2] perf tools: Make Power7 events available for perf Runzhen Wang
2013-06-28  8:14   ` Runzhen Wang
2013-07-19  7:44   ` [tip:perf/core] " tip-bot for Runzhen Wang
2013-07-23  5:33     ` Vince Weaver [this message]
2013-07-23  5:56       ` Michael Ellerman
2013-07-23 21:38         ` Vince Weaver
2013-07-25 13:41           ` Michael Ellerman
2013-07-26  4:25             ` Vince Weaver
2013-07-01  1:53 ` [PATCH v3 0/2] perf tools: Power7 events name " Michael Ellerman
2013-07-01  1:53   ` Michael Ellerman

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