linux-kernel - Re: BPF relocation 'perf test' entries failing was: Re: [GIT PULL 00/27] perf/core improvements and fixes

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Date:   Fri, 27 Jul 2018 08:27:27 +0200
From:   Thomas-Mich Richter <tmricht@...ux.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Sandipan Das <sandipan@...ux.ibm.com>
Cc:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Ingo Molnar <mingo@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Clark Williams <williams@...hat.com>,
        linux-perf-users@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Wang Nan <wangnan0@...wei.com>, linux-kernel@...r.kernel.org,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Hendrik Brueckner <brueckner@...ux.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: BPF relocation 'perf test' entries failing was: Re: [GIT PULL
 00/27] perf/core improvements and fixes

On 07/26/2018 09:14 PM, Arnaldo Carvalho de Melo wrote:
> Em Thu, Jul 26, 2018 at 03:58:05PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Thu, Jul 26, 2018 at 11:04:08PM +0530, Sandipan Das escreveu:
>>> I came across the same problem. Does the following patch fix it?
> 
>>> https://lkml.org/lkml/2018/7/26/669
>  
>> Oh my, that one was subtle... Checking...
> 
> Right, when it said it was running:
> 
>   40.3: BPF prologue generation
> 
> In fact it was running:
> 
>   40.4: BPF relocation checker
> 
> That error message in the 'perf test -v' output:
> 
>   libbpf: Program 'func=sys_write' contains non-map related relo data pointing to section 65522
> 
> Was the _expected_ one for "40.4: BPF relocation checker", then it
> failed when it couldn't run the off by one "last" subtest, duh.
> 
> Thomas, this was a problem introduced by a patch from you, just for
> reference, this one:
> 
>     Fixes: 9ef0112442bd ("perf test: Fix subtest number when showing results")
> 
> I should have caught this by running 'perf test' before/after applying
> that patch, I'll now make sure this is done before sending pull reqs
> upstream.
> 
> In fact I did after, and thought, hey, some BPF related regression, I
> must've updated clang/llvm and something new appeared on the radar, so I
> went that direction and went nowhere, well, now I have an uptodate
> llvm/clang combo to play with BTF, pahole, etc 8-)
> 
> Thanks!
> 
> - Arnaldo



Sandipan,
thanks for fixing what I have messed up.

Arnaldo,
sorry for the hickup, I should have caught this too. In fact I ran
perf test before and after, but redirected the output and just 
looked at the grep'ed lines on the screen....
I should be looked more carefully...

Apologies for the mess and thanks again for fixing this.

-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
--
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