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

From: Adrian Hunter
Date: Wed Mar 19 2014 - 11:23:30 EST

On 19/03/2014 4:43 p.m., Don Zickus wrote:
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@xxxxxxxxxx>

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.

It worked if you looked up the maps on the pid not the tid.
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