On Wed, Oct 09, 2013 at 10:33:25AM +0300, Adrian Hunter wrote:
> On 08/10/13 17:02, Jiri Olsa wrote:
> > On Tue, Oct 08, 2013 at 11:45:50AM +0300, Adrian Hunter wrote:
> >> objdump fails to annotate module symbols when looking
> >> at kcore. Workaround this by extracting object code
> >> from kcore and putting it in a temporary file for
> >> objdump to use instead. The temporary file is created
> >> to look like kcore but contains only the function
> >> being disassembled.
> >
> > Excited to ses this one, but looks like I'm hitting some
> > issue. All annotation starts for me like this:
> >
> >
> > ▒
> > │ Disassembly of section load0:
> > ▒
> > │
> > ▒
> > │ ffffffff815eee80 <load0>:
> > ◆
> > 9.33 │ffffffff815eee80: data32 data32 data32 xchg %ax,%ax
> >
> >
> >
> > which does not seem right
>
> Can you tell me the commits of the kernel and perf tools you
> were using, plus the commands and what symbol it was?
kernel: 3.9.10-100.fc17.x86_64
perf: latest acme's perf/core (06de626 perf evlist: Fix
perf_evlist__mmap_read event overflow )
plus your V5 patches
commands:
sudo ./perf record -e cycles:k -a
sudo ./perf report
---
Samples: 2K of event 'cycles:k', Event count (approx.): 445188286
14.73% swapper [kernel.kallsyms] [k] intel_idle
◆
3.19% X [kernel.kallsyms] [k] smp_call_function_many
▒
1.58% X [kernel.kallsyms] [k] i915_gem_write_fence__ipi
▒
1.58% swapper [kernel.kallsyms] [k] iwl_trans_pcie_read32
▒
annotation of 1st 4 symbols:
---
intel_idle /proc/kcore
│
▒
│
▒
│
▒
│ Disassembly of section load0:
▒
│
▒
│ ffffffff8135f490 <load0>:
▒
1.18 │ data32 data32 data32 xchg %ax,%ax
▒
---
smp_call_function_many /proc/kcore
│
◆
│
▒
│
▒
│ Disassembly of section load0:
▒
│
▒
│ ffffffff810bc270 <load0>:
▒
│ data32 data32 data32 xchg %ax,%ax
▒
---
i915_gem_write_fence__ipi /proc/kcore
│
│
│
│ Disassembly of section load0:
│
│ ffffffffa0086630 <load0>:
│ data32 data32 data32 xchg %ax,%ax
---
iwl_trans_pcie_read32 /proc/kcore
│
│
│
│ Disassembly of section load0:
│
│ ffffffffa0414a50 <load0>:
│ data32 data32 data32 xchg %ax,%ax
the rest of the instruction decode differs.. just the first
line is same for all
addresses seem ok:
[jolsa@krava perf]$ egrep
'ffffffff8135f490|ffffffff810bc270|ffffffffa0086630|ffffffffa0414a50'
/proc/kallsyms
ffffffff810bc270 T smp_call_function_many
ffffffff8135f490 t intel_idle
ffffffffa0414a50 t iwl_trans_pcie_read32 [iwlwifi]
ffffffffa0086630 t i915_gem_write_fence__ipi [i915]
so.. the name of the section, name of the <function> plus the first
instruction decode seem wrong.. I can see that in every symbol I
annotate in the report and in annotate command as well.
jirka
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