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Message-ID: <52A9C08A.2050500@intel.com>
Date: Thu, 12 Dec 2013 15:56:26 +0200
From: Adrian Hunter <adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki,
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To: David Ahern <dsahern@gmail.com>
CC: Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org,
        Frederic Weisbecker <fweisbec@gmail.com>, Jiri Olsa <jolsa@redhat.com>,
        Mike Galbraith <efault@gmx.de>, Namhyung Kim <namhyung@gmail.com>,
        Paul Mackerras <paulus@samba.org>,
        Stephane Eranian <eranian@google.com>, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH v0 13/71] perf tools: Add machine__get_thread_pid()
References: <1386765443-26966-1-git-send-email-alexander.shishkin@linux.intel.com> <1386765443-26966-14-git-send-email-alexander.shishkin@linux.intel.com> <52A8BCCE.9010300@gmail.com>
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On 11/12/13 21:28, David Ahern wrote:
> On 12/11/13, 5:36 AM, Alexander Shishkin wrote:
>> From: Adrian Hunter <adrian.hunter@intel.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?

Next pid unfortunately.