Il giorno mer, 29/01/2014 alle 12.18 +0100, Jiri Olsa ha scritto:
> this one could be caused by:
> http://marc.info/?l=linux-kernel&m=134934717011451&w=2
> I never managed to push this change through.. need to revisit it ;-)
>
> if you want to try, I rebased the patch and put it in here:
> git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
> branch perf/rsp_fix1
>
> commit:
>
> https://git.kernel.org/cgit/linux/kernel/git/jolsa/perf.git/commit/?h=perf/rsp_fix1&id=5eed39431f9b1e65e740a2e3e197c79f0a1bcf6b
>
> it still fixies some of the backtraces for me
Hi, the patch improves things considerably. However, I still get several
"0x0" on top of the _start() function, e.g.:
15.79% ls [kernel.kallsyms] [k]
_raw_spin_unlock_irqrestore
|
--- _raw_spin_unlock_irqrestore
|
|--33.33%-- console_unlock
| con_write
| n_tty_write
| tty_write
| vfs_write
| sys_write
| system_call
| __GI___libc_write
| _IO_file_write@@GLIBC_2.2.5
| new_do_write
| _IO_do_write@@GLIBC_2.2.5
| _IO_file_overflow@@GLIBC_2.2.5
| print_many_per_line
| print_current_files
| print_dir
| main
| __libc_start_main
| _start
| 0x0 <---- HERE
I also get an occasional screw in the dynamic linker code path:
5.26% ls [kernel.kallsyms] [k]
lock_release
|
--- lock_release
__mem_cgroup_try_charge
mem_cgroup_charge_common
mem_cgroup_newpage_charge
do_wp_page
handle_mm_fault
__do_page_fault
do_page_fault
do_async_page_fault
async_page_fault
__init_cpu_features
0x7fd2357470de <---- HERE
_dl_relocate_object
dl_main
_dl_sysdep_start
_dl_start
_dl_start_user
and in the exit() path:
5.26% ls [kernel.kallsyms] [k]
do_raw_spin_trylock
|
--- do_raw_spin_trylock
unmap_single_vma
unmap_vmas
exit_mmap
mmput
do_exit
do_group_exit
0xffffffff81068184
system_call
Other than that, it looks perfect. Thanks a lot!
Mauro
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