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

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Message-ID: <52A8BCCE.9010300@gmail.com>
Date:	Wed, 11 Dec 2013 12:28:14 -0700
From:	David Ahern <dsahern@...il.com>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	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>,
	Andi Kleen <ak@...ux.intel.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH v0 13/71] perf tools: Add machine__get_thread_pid()

On 12/11/13, 5:36 AM, Alexander Shishkin wrote:
> From: Adrian Hunter <adrian.hunter@...el.com>
>
> Add a function to get the pid from the tid.
>
> This is needed when using the sched_switch
> tracepoint to follow object code execution.
> sched_switch identifies the thread but, to
> find the process mmaps, we need the process
> pid.

Are you looking up the current or next task? If the former why not use 
sample->pid rather than parsing the sched_switch tracepoint?

David

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