linux-kernel - Re: [PATCH 0/6] perf tools: Share map groups within process

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Message-ID: <20140320083333.GA3762@krava.redhat.com>
Date:	Thu, 20 Mar 2014 09:33:33 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Don Zickus <dzickus@...hat.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 0/6] perf tools: Share map groups within process

On Tue, Mar 18, 2014 at 03:46:50PM +0100, Jiri Olsa wrote:
> hi,
> this patchset moves thread's map_groups to be dynamically
> allocated and shared within process threads.
> 
> The main benefit would be to be able to look up memory
> map from any thread that belongs to the process.
> 
> This implements one of the solution ideas for issue
> described by Don in following thread:
> http://marc.info/?l=linux-kernel&m=139403876017159&w=2
> 
> RFC changes:
>   - added automated test for thread map groups get/put methods
>   - fix reference count for case described by Namhyung
>   - rename the mmap-events.c test to mmap-thread-lookup.c
>   - added PROT_EXEC to mmap call in tests/mmap-thread-lookup.c
>     as it's not implied by default on all archs (Namhyung)
>   - lazy mg allocation in thread__find_addr_map (Namhyung)
>   - fix compilation failures (Arnaldo)
> 
> also available in here:
>   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
>   perf/core_mmaps

Arnaldo,
I rebased this to your latest perf/core

thanks,
jirka
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