Em Thu, Jun 03, 2010 at 02:54:45PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Jun 03, 2010 at 07:23:02PM +0200, Stephane Eranian escreveu:
> > # perf annotate (or annotate -d '[kernel.kallsyms]'?)
> > Can't annotate __lock_acquire: No vmlinux file was found in the path
> >
> > # perf annotate -k vmlinux
> > objdump: '[kernel.kallsyms]': No such file
>
> This looks like a bug in how it reports this problem, probably vmlinux
> is not in the current directory, or it is but has a build-id that
> doesn't matches the one in the perf.data file.
>
> But the message is wrong, should be like it is in the tui, for this same
> situation:
>
> ui_helpline__puts("No vmlinux file found, can't "
> "annotate with just a kallsyms file");
>
> > Am I missing something here?
>
> If you don't specify it with --vmlinux/-k it will try to find it in one
> of these places:
>
> vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
> vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
> snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
> vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux",
> uts.release);
> vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
> snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
> uts.release);
> vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
>
> It also now looks at /sys/kernel/notes, gets the build-id, and looks up
> in the build-id cache.
For instance, here using -vvv I get:
[r...@emilia ~]# perf annotate -vvv memcpy > /dev/null
build id event received for [kernel.kallsyms]:
310920b54cbbf242dbfa09052f652806d2c73821
build id event received for /lib64/libtinfo.so.5.7:
cd9da7b5b1fcb25ee6b3762bb9fe62f782590fd5
Looking at the vmlinux_path (6 entries long)
No build_id in
/root/.debug/.build-id/31/0920b54cbbf242dbfa09052f652806d2c73821, ignoring it
No build_id in vmlinux, ignoring it
No build_id in /boot/vmlinux, ignoring it
No build_id in /boot/vmlinux-2.6.35-rc1, ignoring it
Using /lib/modules/2.6.35-rc1/build/vmlinux for symbols
hist_entry__inc_addr_samples: ip=0xffffffff811ea69e
0xffffffff811ea690 memcpy: period++ [ip: 0xffffffff811ea69e, 0xe] => 1
hist_entry__annotate: filename=/lib/modules/2.6.35-rc1/build/vmlinux,
sym=memcpy, start=0xffffffff811ea690, end=0xffffffff811ea730
annotating [0x187e770] /lib/modules/2.6.35-rc1/build/vmlinux : [0x19b1f70]
memcpy
Executing: objdump --start-address=0xffffffff811ea690
--stop-address=0xffffffff811ea730 -dS
/lib/modules/2.6.35-rc1/build/vmlinux|grep -v
/lib/modules/2.6.35-rc1/build/vmlinux|expand
[r...@emilia ~]#
I'm removing all vmlinux from the path so that I can reproduce what you see.
- Arnaldo
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