linux-kernel - Re: [PATCH 06/13] perf tools: Use tid in mmap/mmap2 events to find maps

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Message-ID: <20140319144353.GC25953@redhat.com>
Date:	Wed, 19 Mar 2014 10:43:53 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 06/13] perf tools: Use tid in mmap/mmap2 events to find
 maps

On Wed, Mar 19, 2014 at 04:27:25PM +0200, Adrian Hunter wrote:
> On 19.03.2014 15:30, Jiri Olsa wrote:
> > On Wed, Mar 19, 2014 at 09:19:45AM -0400, Don Zickus wrote:
> >> On Wed, Mar 19, 2014 at 09:13:38AM +0200, Adrian Hunter wrote:
> >>> On 18.03.2014 23:25, Arnaldo Carvalho de Melo wrote:
> >>>> From: Don Zickus <dzickus@...hat.com>
> >>>>
> >>>> Now that we can properly synthesize threads system-wide, make sure the
> >>>> mmap and mmap2 events use tids instead of pids to locate their maps.
> >>>
> >>> This is a good change but it cannot go yet because it is dependent on Jiri's
> >>> "perf tools: Share map groups within process" series.
> >>
> >> No it isn't. :-) Commit bfd66cc71a3f831ba7c2116d79416cfb8883f6cf is the
> >> reason why.  It synthesizes thread events to make this work correctly.
> > 
> > ok, I haven't realized this one was pulled in as well ;-)
> > it's ok then..
> 
> No, you mustn't split up the maps between threads.  We currently assume
> CLONE_VM is always used to create threads.

But that doesn't work when you try to synthesize threads which was the
problem I was trying to solve.

Cheers,
Don
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