linux-kernel - Re: perf report --branch-history segfaul hists browser: Print overhead percent value for first-level callchain

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Message-ID: <20141127182558.GV12538@two.firstfloor.org>
Date:	Thu, 27 Nov 2014 19:25:58 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>
Subject: Re: perf report --branch-history segfaul hists browser: Print
 overhead percent value for first-level callchain

Thanks for testing.

> Yeah, you are right:
> 
> [acme@zoo linux]$ addr2line -e /usr/lib/debug/usr/lib64/firefox/libxul.so.debug 22fefe8
> BFD: Dwarf Error: Offset (2585882475) greater than or equal to
> .debug_str size (44321517).
> BFD: Dwarf Error: Could not find abbrev number 11800.
> BFD: Dwarf Error: Offset (493511937) greater than or equal to .debug_str
> size (44321517).

But addr2line didn't crash? What happens when you run it under valgrind?

If yes, I can check what it does differently than get_srcline() to make
it recover better.

-Andi

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