linux-kernel - Re: [PATCH 39/41] perf tools: Allow TSC conversion on any arch

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Message-ID: <20140715161733.GO6758@twins.programming.kicks-ass.net>
Date:	Tue, 15 Jul 2014 18:17:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 39/41] perf tools: Allow TSC conversion on any arch

On Tue, Jul 15, 2014 at 12:20:03PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Jul 14, 2014 at 01:03:03PM +0300, Adrian Hunter escreveu:
> > It is possible to record a perf.data file on
> > one architecture and process it on another.
> > Consequently, TSC conversion functions need
> > to be moved out of the arch directory.
> 
> Can you state where a TSC is stored in perf.data, and how in the !x86
> arch this will be detected so that those functions will be used?

So there's nothing intrinsically x86/tsc about the perf interface here,
although that's currently the only one implementing this thing.

Other archs could equally expose their 'cycle' counter etc..

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