Messages in this thread | | | Date | Tue, 6 Jul 2021 14:51:50 +0900 | From | Masami Hiramatsu <> | Subject | Re: [PATCH 0/3] perf: Fix perf probe for Fedora34 glibc update |
| |
On Mon, 5 Jul 2021 13:48:04 -0700 Namhyung Kim <namhyung@gmail.com> wrote:
> On Sat, Jul 3, 2021 at 8:36 AM Masami Hiramatsu <mhiramat@kernel.org> wrote: > > > > 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. > > Do you know what's the rationale of the move? > Is it a change from glibc or Fedora?
I don't know, but it seems that this happens when updating glibc package, the version is same but revision is different. Also, in the Ubuntu, I saw all symbols has been moved to .dynsym in older glibc. Thus I guess that this depends on the build option or configuration. Might Fedora change the packaging script?
Thank you,
> > Thanks, > Namhyung > > > > > > 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@kernel.org>
-- Masami Hiramatsu <mhiramat@kernel.org>
| |