linux-kernel - Re: [PATCH 3/4] perf tools: Check libunwind for availability of dwarf parsing feature

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Message-ID: <CAFrcx1kNONpBcsEHX1PN0kNUCOAkBCid+bgbv3mc0TPu=F+MYg@mail.gmail.com>
Date:	Tue, 8 Oct 2013 16:15:40 +0200
From:	Jean Pihet <jean.pihet@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Jiri Olsa <jolsa@...hat.com>, Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH 3/4] perf tools: Check libunwind for availability of dwarf
 parsing feature

Hi,

On 8 October 2013 12:47, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, Oct 08, 2013 at 12:44:32PM +0200, Jean Pihet wrote:
>> Hi,
>>
>> On 26 September 2013 14:48, Jiri Olsa <jolsa@...hat.com> wrote:
>> > On Thu, Sep 26, 2013 at 01:36:37PM +0200, Jean Pihet wrote:
>> >> The newly added dwarf unwinding feature [1] requires:
>> >> . a recent version (>= 1.1) of libunwind,
>> >> . libunwind to be configured with --enable-debug-frame.
>> >>
>> >> [1] http://www.spinics.net/lists/kernel/msg1598951.html
>> >>
>> >> Add the corresponding API tests in the feature check list.
>> >
>> > Acked-by: Jiri Olsa <jolsa@...hat.com>
>> >
>> > thanks,
>> > jirka
>>
>> Thanks for the ack!
>>
>> Is it possible to get an ack from the perf core maintainers?
>> Also, is the patch going in Will's tree?
>
> This being a tools patch you'd have to ask acme; also I know next to
> nothing about all this unwind business except that its stupid expensive
> ;-)
You are right! It brings some more info on the trace though.

-- adding Arnaldo in the loop --
Arnaldo, are you OK with the changes [1]? Jiri acked the patches
already; Will is willing (no pun intended) to take the ARM specific
patches [2] in his tree.

[1] http://www.spinics.net/lists/kernel/msg1608921.html and
http://www.spinics.net/lists/kernel/msg1608922.html
[2] http://www.spinics.net/lists/kernel/msg1608920.html and
http://www.spinics.net/lists/kernel/msg1608923.html

Regards,
Jean
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