Messages in this thread | | | From | Namhyung Kim <> | Subject | Re: perf: cannot resolve kernel symbols | Date | Mon, 23 Sep 2013 15:58:31 +0900 |
| |
Hi Jean,
On Thu, 19 Sep 2013 15:24:56 +0200, Jean Pihet wrote: > Hi, > > Ping on this issue. Any idea or pointer.
Did you build perf without libelf?
Thanks, Namhyung
> > Cheers, > Jean > > On 17 September 2013 14:02, Jean Pihet <jean.pihet@linaro.org> wrote: >> Hi, >> >> I am running the perf record and report commands, which are running OK >> but I do not get any kernel symbol resolved when using a built and >> installed kernel. >> Using the distro installed kernel is OK though. >> The setup is: Marvell ARMv7 quad core, Linaro Ubuntu release. >> >> Here are the commands in use: >> - perf record -g dwarf -- stress --cpu 2 --io 2 --vm 2 --timeout 1s >> - perf report -vvv >> >> With a vmlinux found at /lib/modules/<version>/build I get the >> following in the trace output: >> ... >> Looking at the vmlinux_path (6 entries long) >> Using /lib/modules/3.11.0-00003-g0d4d4a1/build/vmlinux for symbols >> ... >> dso: [kernel.kallsyms] >> (/lib/modules/3.11.0-00003-g0d4d4a1/build/vmlinux, Functions, loaded, >> 0000000000000000000000000000000000000000) >> c00081c0-c00081c3 g asm_do_IRQ >> ... >> dso: [kernel.kallsyms].head.text ([kernel.kallsyms], Functions, loaded, 00000000 >> 00000000000000000000000000000000) >> c0008000-c0008077 g stext >> c0008000-c0008000 g _text >> c0008084-c0008127 l __create_page_tables >> ... >> dso: [kernel.kallsyms].init.text ([kernel.kallsyms], Functions, loaded, 00000000 >> 00000000000000000000000000000000) >> c04f3260-c04f32af l __fixup_smp >> >> >> Without any vmlinux found I get the following: >> ... >> Looking at the vmlinux_path (6 entries long) >> Using /proc/kallsyms for symbols >> ... >> dso: [kernel.kallsyms] ([kernel.kallsyms], Functions, loaded, >> 0000000000000000000000000000000000000000) >> 0-beffffff l __vectors_start >> dso: [kernel.kallsyms] ([kernel.kallsyms], Variables, NOT loaded, >> 0000000000000000000000000000000000000000) >> dso: stress (/usr/bin/stress, Functions, loaded, >> bdf57306ab106fb0ce9835c95dae5b173f238b61) >> ... >> >> >> In any case the symbols are not resolved although vmlinux contains >> symbols and /proc/kallsyms is accessible and working correctly. >> Any idea on where to look at? I guess the problem is in the kernel installation. >> >> Thx & regards, >> Jean
| |