linux-kernel - Re: [PATCH V9 04/14] perf tools: change machine__findnew

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Message-ID: <87li4dyjv4.fsf@sejong.aot.lge.com>
Date:	Wed, 07 Aug 2013 17:40:15 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH V9 04/14] perf tools: change machine__findnew_thread() to set thread pid

On Wed, 07 Aug 2013 11:34:23 +0300, Adrian Hunter wrote:
> On 07/08/13 10:51, Namhyung Kim wrote:
>> On Mon,  5 Aug 2013 19:26:24 +0300, Adrian Hunter wrote:
>>> Add a new parameter for 'pid' to machine__findnew_thread().
>>> Change callers to pass 'pid' when it is known.
>>>
>> [SNIP]
>> 
>>> @@ -198,7 +198,7 @@ static int perf_event__inject_buildid(struct perf_tool *tool,
>>>  
>>>  	cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
>>>  
>>> -	thread = machine__findnew_thread(machine, event->ip.pid);
>>> +	thread = machine__findnew_thread(machine, event->ip.pid, event->ip.pid);
>> 
>> Maybe I'm missing something.  Why not use event->ip.tid here?
>
> That is covered here:
>
> 	http://marc.info/?l=linux-kernel&m=137513636309689&w=2

Oh, I missed the thread..

Btw, it'd be better if you keep David's (and possbily other's too)
Acked- or Reviewed-by tags in the changelog unless things changed
wildly.

[SNIP]
>> 
>> Hmm.. now I'm thinking that it's related to sharing map_groups between
>> threads within a process.  To do that, IMHO we need more sophisticated
>> handling rather than passing either pid or tid depending on contexts?
>
> Yes there is always more that could be done.

:)

Thanks,
Namhyung
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