linux-kernel - Re: [PATCH 1/3] perf, tool: Add parser generator for events parsing

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Date:	Thu, 22 Dec 2011 14:32:28 -0500 (EST)
From:	Vince Weaver <vince@...ter.net>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Jiri Olsa <jolsa@...hat.com>, acme@...hat.com, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] perf, tool: Add parser generator for events
 parsing

On Tue, 20 Dec 2011, Peter Zijlstra wrote:

> 
> This would allow us to write things like:
> 
>  perf record -e cpu/event=0x34,umask=0x01,inv,cmask=2

I know this is beating a dead horse, but are you guys *really* that 
against just linking against libpfm4?

Instead of (to use your example):
    perf record -e cpu/event=0x34,umask=0x01,inv,cmask=2
Insn't
    perf record -e nhm::UNC_CBO_CACHE_LOOKUP:M:i=1:cmask=2
much nicer? 

And the code that translates that to bits for you already exists in a nice 
library form.  And it supports Pentium 4 already.

In PAPI we're finally moving to all string-based event names simply 
because trying to create cross-platform ways of specifying bits like you 
are just didn't work very well.

Vince

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