linux-kernel - Re: [Patch v1 04/10] perf/x86: add memory profiling via PEBS Load Latency

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Message-ID: <20121029211615.GL2266@tassilo.jf.intel.com>
Date:	Mon, 29 Oct 2012 14:16:15 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [Patch v1 04/10] perf/x86: add memory profiling via PEBS Load
 Latency

> > Why do you need to replace the whole table?
> >
> Because I am extending them with one or two events based on cpu
> model. That was the easiest way of doing this instead of playing
> some kind of malloc+copy trick.

I did malloc and copy.

> 
> > BTW I still think my approach in the v4 Haswell patchkit
> > is simpler and didn't rely on hardcoding these events.
> >
> I don't care about those events. As I found out, they are not even
> used by perf because they are all hardcoded and that's what gets
> used. I assume they are exposed for reference only. I don't object
> to that. But I think the right mechanism would be one where you
> can add events at boot time based on CPU model. It could be used
> to add the common events as well in the common part of the init
> code.

Yes that's what I did. 

I don't think copying everything for everything new is a good 
approach.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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