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

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Message-ID: <20140319101907.GE1449@krava.brq.redhat.com>
Date:	Wed, 19 Mar 2014 11:19:08 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Don Zickus <dzickus@...hat.com>,
	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 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.
> 
> perf tools assume that threads share virtual memory.  That means that a
> mapping created by one thread is visible to all threads in the thread group.
>  That was implemented by putting all the maps on the thread group leader
> (pid == tid).  The alternative is to share the map groups instead, which is
> what Jiri is doing.

right, this needs the sharing map groups changes
(or the 1/2 patch Don sent prior to this patch)

jirka
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