linux-kernel - Re: [PATCH v0 13/71] perf tools: Add machine__get_thread

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Message-ID: <87fvpzulvl.fsf@tassilo.jf.intel.com>
Date:	Wed, 11 Dec 2013 13:18:54 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH v0 13/71] perf tools: Add machine__get_thread_pid()

David Ahern <dsahern@...il.com> writes:
>
> Are you looking up the current or next task? If the former why not use
> sample->pid rather than parsing the sched_switch tracepoint?

The itrace stream doesn't have a pid field, and it needs the exact
time stamp of the switch. There may not actually be any samples
before decoding.

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