linux-kernel - Re: [PATCH v2] perf symbols: Fix annotation of objects with debuginfo files

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Message-ID: <20160815194811.GC20972@kernel.org>
Date:	Mon, 15 Aug 2016 16:48:11 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	"Wangnan (F)" <wangnan0@...wei.com>
Cc:	Anton Blanchard <anton@....ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
	Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf symbols: Fix annotation of objects with
 debuginfo files

Em Mon, Aug 15, 2016 at 03:13:47PM +0800, Wangnan (F) escreveu:
> 
> 
> On 2016/8/13 9:55, Anton Blanchard wrote:
> > From: Anton Blanchard <anton@...ba.org>
> > 
> > Commit 73cdf0c6ea9c ("perf symbols: Record text offset in dso
> > to calculate objdump address") started storing the offset of
> > the text section for all DSOs:
> > 
> >         if (elf_section_by_name(elf, &ehdr, &tshdr, ".text", NULL))
> >                 dso->text_offset = tshdr.sh_addr - tshdr.sh_offset;
> > 
> > Unfortunately this breaks debuginfo files, because we need to calculate
> > the offset of the text section in the associated executable file. As a
> > result perf annotate returns junk for all debuginfo files.
> > 
> > Fix this by using runtime_ss->elf which should point at the executable
> > when parsing a debuginfo file.
> > 
> > Cc: stable@...r.kernel.org # v4.6+
> > Fixes: 73cdf0c6ea9c ("perf symbols: Record text offset in dso to calculate objdump address")
> > Signed-off-by: Anton Blanchard <anton@...ba.org>
> 
> I don't quite understand the debuginfo problem. I tested
> this patch follow steps recorded in commit 99e87f7 and
> see no problem.
> 
> Tested-by: Wang Nan <wangnan0@...wei.com>

Thanks, applied.

- Arnaldo