lkml.org 
[lkml]   [2021]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [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>

    \
     
     \ /
      Last update: 2021-07-06 07:52    [W:3.190 / U:1.156 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site