linux-kernel - [PATCH 0/3] perf: Fix perf probe for Fedora34 glibc update

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Date:   Sun,  4 Jul 2021 00:35:10 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-perf-users@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Stefan Liebler <stli@...ux.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] perf: Fix perf probe for Fedora34 glibc update

Hi Arnaldo,

Here is a series of patches to fix the perf-probe error against the
Fedora34 glibc update, which moves most of symbols from .symtab to
.dynsym. The key is that the "most of" symbols moved, but it still
have some PLT symbols in .symtab. Thus the perf symbol-elf failes to
decode symbols.

Here is the original report from Thomas about this issue.

 https://lore.kernel.org/linux-perf-users/f6752514-eaf9-371e-f81b-0d9e41ebae0c@linux.ibm.com/

Thank you,

---

Masami Hiramatsu (3):
      perf-probe: Fix debuginfo__new() to enable build-id based debuginfo
      perf symbol-elf: Decode dynsym even if symtab exists
      perf probe: Do not show @plt function by default


 tools/perf/builtin-probe.c     |    2 -
 tools/perf/util/probe-finder.c |    5 ++
 tools/perf/util/symbol-elf.c   |   82 ++++++++++++++++++++++++++--------------
 3 files changed, 60 insertions(+), 29 deletions(-)

--
Masami Hiramatsu (Linaro) <mhiramat@...nel.org>