linux-kernel - Re: [PATCH] perf symbol: Fail to read phdr workaround

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Message-ID: <20220801132511.GC73228@leoy-ThinkPad-X240s>
Date:   Mon, 1 Aug 2022 21:25:11 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf symbol: Fail to read phdr workaround

On Mon, Aug 01, 2022 at 09:38:23AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sun, Jul 31, 2022 at 11:19:15PM -0700, Ian Rogers escreveu:
> > On Sun, Jul 31, 2022, 6:53 PM Leo Yan <leo.yan@...aro.org> wrote:
> > 
> > > On Sun, Jul 31, 2022 at 09:49:23AM -0700, Ian Rogers wrote:
> > > > The perf jvmti agent doesn't create program headers, in this case
> > > > fallback on section headers as happened previously.
> > > >
> > > > Fixes: 882528d2e776 ("perf symbol: Skip symbols if SHF_ALLOC flag is not
> > > set")
> > >
> > > It's good to change fix tag as:
> > > Fixes: 2d86612aacb7 ("perf symbol: Correct address for bss symbols")
> > >
> > 
> > Doh! I was rushing this morning. Thanks for catching and reviewing!
> 
> I made the adjustments and added a note with the repro, to help in the
> future when trying to test this area.

Thanks, Arnaldo.

> I also think we could have something like a 'perf test' mode where, when
> asked to, it would enable tests that involve downloading such files to
> perform tests, such as this dacapo benchmark, and then would test if the
> output matches expectations.

I will add a testing based on the steps, alongside with the discussed
testing for data symbols.  Will share out after get ready.

Thanks,
Leo