linux-kernel - Re: [PATCH v3 2/4] perf tests: make objdump disassemble zero blocks

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Message-ID: <20150903163706.GF11521@kernel.org>
Date:	Thu, 3 Sep 2015 13:37:06 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jan Stancek <jstancek@...hat.com>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	linux-kernel@...r.kernel.org, jolsa@...nel.org, dsahern@...il.com,
	cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com, mingo@...nel.org,
	namhyung@...nel.org, paulus@...ba.org, a.p.zijlstra@...llo.nl
Subject: Re: [PATCH v3 2/4] perf tests: make objdump disassemble zero blocks

Em Thu, Sep 03, 2015 at 06:19:04PM +0200, Jan Stancek escreveu:
> On 09/03/2015 05:14 PM, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Sep 03, 2015 at 02:35:55PM +0300, Adrian Hunter escreveu:
> >> On 03/09/15 14:23, Jan Stancek wrote:
> >>> Add -z parameter to avoid skipping zero blocks:
> >>>
> >>>  ffffffff816704fe <sysret_check+0x4b>:
> >>>  ffffffff816704fe:  7b 34         jnp ffffffff81670534 <sysret_signal+0x1c>
> >>>        ...
> >>>  ffffffff81670501 <sysret_careful>:
> >>>  ffffffff81670501:  0f ba e2 03   bt  $0x3,%edx
> >>>  ffffffff81670505:  73 11         jae ffffffff81670518 <sysret_signal>
> >>
> >> Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> > 
> > Ok, I am applying this, but it would be nice to know in which systems,
> > with which objdump/binutils versions which 'perf test' entry fails, with
> > the output of such failure.
> > 
> > Jan, can you please provide this info?
> 
> Since my original report last year [1], I've seen it fail many times on

Ok, so it is a longstanding bug and now I have some tool output where it
fails to complement what was in these two patches, thanks, I'll update
it and put it on my next perf/urgent pull request to upstream.

- Arnaldo
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