Messages in this thread | | | Date | Fri, 15 Aug 2014 10:29:34 +0900 | From | Masami Hiramatsu <> | Subject | Re: Re: [PATCH] perf probe: Warn user to rebuild target with debuginfo |
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(2014/08/15 10:07), Arnaldo Carvalho de Melo wrote: > Em Thu, Aug 14, 2014 at 01:07:28PM -0700, Brendan Gregg escreveu: >> On Thu, Aug 14, 2014 at 11:29 AM, Masami Hiramatsu >> <masami.hiramatsu.pt@hitachi.com> wrote: >> [...] >>> The "rebuild with ..." part changes to "rebuild with CONFIG_DEBUG_INFO" >>> if the target is the kernel or a kernel module. > >> Thanks, definitely an improvement! Should the kernel message also >> mention kernel debuginfo packages? Depends on the distribution and >> environment, but I think for some users the solution is to add the >> package.
I see, and at least fedora/rhel has debuginfo for all packages. So, not only for the kernel, but also for user applications, we'll need to do that.
> Yeah, something like what is suggested by gdb and documented here: > > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Developer_Guide/intro.debuginfo.html > > -------------------------------------------------------------------- > In some cases (such as loading a core file), GDB does not know the > name, version, or release of a name-debuginfo-version-release.rpm > package; it only knows the build-id. In such cases, GDB suggests a > different command: > > gdb -c ./core > [...] > Missing separate debuginfo for the main executable filename > Try: yum --disablerepo='*' --enablerepo='*debug*' install /usr/lib/debug/.build-id/ef/dd0b5e69b0742fa5e5bad0771df4d1df2459d1 > ---------------------------------------------------------------------
ah, that's nice :)
> > This is something I want to have eventually, i.e. to have per distro > plugins to automatically download packages required for some features, > like probing and annotation, for instance.
Yeah, however, it depends on the distro. AFAIK, ubuntu provides debuginfo package only for the kernel. So, at this point, I think what we can do is just say "please install debuginfo package" as below.
$ ./perf probe -x perf -L argv_split The /home/fedora/ksrc/linux-3/tools/perf/perf file has no debug information, rebuild with -g. Or install appropriate debuginfo package. Error: Failed to show lines.
Thank you,
-- Masami HIRAMATSU Software Platform Research Dept. Linux Technology Research Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com
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