linux-kernel - Re: [BUG] perf: buildid not managed properly when cmd path is relative

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Date:	Sat, 29 May 2010 19:57:54 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [BUG] perf: buildid not managed properly when cmd path is
 relative

Em Thu, May 27, 2010 at 03:46:16PM +0200, Stephane Eranian escreveu:
> I ran into another problem while running more tests with
> perf record, perf buildid-list.
> 
> I do the following:
> 
> $ perf record foo/noploop 5
> $ perf buildid-list
> 54b1e7cc3cf52e0db255aab44ce7538eb62655b8 [kernel.kallsyms]
> 875ae61623e89f408b425ca0486a9ec99e3ac73e
> /home/eranian/perfmon/official/tip/build/tools/perf/foo/noploop
> 
> I know I have samples in noploop:
> $ perf report -D
> ...
> 0x10a0 [0x20]: PERF_RECORD_SAMPLE(IP, 2): 14721/14721: 0x4006d6 period: 2351576
>  ... thread: noploop:14721
>  ...... dso: ./foo/noploop
> 
> But if I ask with buildid-list (like per-archive is doing) then I get:
> 
> $ perf buildid-list --with-hits
> 54b1e7cc3cf52e0db255aab44ce7538eb62655b8 [kernel.kallsyms]
> 0000000000000000000000000000000000000000 ./foo/noploop
> 
> The builid is bogus for noploop and it is relative path not full anymore.
> 
> I instrumented __dsos__fprintf_buildid() and I get:
> hit=0 name=/home/eranian/perfmon/official/tip/build/tools/perf/foo/noploop
> hit=1 name=./foo/noploop
> 0000000000000000000000000000000000000000 ./foo/noploop
> 
> So it looks like when cmd is relative there are two entries but the one
> that counts the hits is the one with relative path. But is does not have
> the buildid, the full path entry does.
> 
> This is an issue because perf-archive only packages the
> content of .debug with hits.
> 
> The problem does not exists when cmd are found from PATH.

I reproduced the problem, and yeah, annoying, will work on it, thanks
for the report.

- Arnaldo
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