linux-kernel - Re: [PATCH 00/10] perf symbols: Improve dso__synthesize_plt

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Date:   Fri, 20 Jan 2023 11:11:31 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 00/10] perf symbols: Improve dso__synthesize_plt_symbols()

Em Fri, Jan 20, 2023 at 02:34:46PM +0200, Adrian Hunter escreveu:
> Hi
> 
> This is the first of 2 patchsets to improve dso__synthesize_plt_symbols().
> This patchset is really preparation for the 2nd patchset, which focuses
> on getting rid of unknown symbols that show up in Intel PT traces.
> The 2nd patchset is still under development.
> 
> These patches are small and staightforward. Only the new Symbols test is
> slightly interesting because it provides a way to see what symbols
> perf discovers for any given dso. The test fails initially, but
> should pass after patch 7 "perf symbols: Add symbol for .plt header".

Looks nice, I've test build, one by one and used the test with a
different --dso, etc. I'll keep it today locally for further container
tests and to give time to others to look at it, I'll have it in
tmp.perf/core soon.

- Arnaldo
 
> 
> Adrian Hunter (10):
>       perf test: Add Symbols test
>       perf symbols: Factor out get_plt_sizes()
>       perf symbols: Check plt_entry_size is not zero
>       perf symbols: Add dso__find_symbol_nocache()
>       perf symbols: Slightly simplify 'err' usage in dso__synthesize_plt_symbols()
>       perf symbols: Do not check ss->dynsym twice
>       perf symbols: Add symbol for .plt header
>       perf symbols: Allow for .plt entries with no symbol
>       perf symbols: Combine handling for SHT_RELA and SHT_REL
>       perf symbols: Check SHT_RELA and SHT_REL type earlier
> 
>  tools/perf/Documentation/perf-test.txt |   3 +
>  tools/perf/tests/Build                 |   1 +
>  tools/perf/tests/builtin-test.c        |   3 +
>  tools/perf/tests/symbols.c             | 150 ++++++++++++++++++++++++++
>  tools/perf/tests/tests.h               |   3 +
>  tools/perf/util/symbol-elf.c           | 190 +++++++++++++++++----------------
>  tools/perf/util/symbol.c               |   5 +
>  tools/perf/util/symbol.h               |   1 +
>  8 files changed, 262 insertions(+), 94 deletions(-)
>  create mode 100644 tools/perf/tests/symbols.c
> 
> 
> Regards
> Adrian

-- 

- Arnaldo