linux-kernel - Re: perf/Documentation/ABI -- add some documentation for perf

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Message-ID: <20130704090253.GJ18898@dyad.programming.kicks-ass.net>
Date:	Thu, 4 Jul 2013 11:02:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Stephane Eranian <eranian@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: perf/Documentation/ABI -- add some documentation for perf_event
 sysfs usage

On Wed, Jul 03, 2013 at 11:14:40PM -0400, Vince Weaver wrote:
> On Wed, 3 Jul 2013, Vince Weaver wrote:

> OK, don't I feel silly, these values were already documented in 
>    Documentation/ABI/testing/sysfs-bus-event_source-devices-events
> rather than ABI/stable
> 
> To be fair I missed it because the documentation seemed to come from the 
> Power developers and not through perf_event
>
> anyway, that documentation says the values will be hex only, which was 
> broken by
> 
> commit f9134f36aed59ab55c0ab1a4618dd455f15aef5f
> Author: Andi Kleen <ak@...ux.intel.com>
> Date:   Mon Jun 17 17:36:52 2013 -0700
> 
>     perf/x86/intel: Add mem-loads/stores support for Haswell
> 
> 
> which added:
> EVENT_ATTR_STR(mem-loads,      mem_ld_hsw,     "event=0xcd,umask=0x1,ldlat=3");
> 
> (note ldlat is not in hex).
> 
> This broke the trinity fuzzer (which scans to look for events to use)
> as well as some of my personal tools.
> 
> Should the ldlat value be fixed to be hex?  Or should we ammend the ABI
> document to allow decimal?

I don't see a good reason not to allow decimal as well. Jolsa?
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