Re: [RFC PATCH] Perf Bench: Locking Microbenchmark

[Davidlohr Bueso]

On Wed, 2014-10-01 at 07:28 +0200, Ingo Molnar wrote:
> If you compare an strace of AIM7 steady state and 'perf bench 
> lock' steady state, is it comparable, i.e. do the syscalls and 
> other behavioral patterns match up?

With more than 1000 users I'm seeing:

-  33.74%    locking-creat  [kernel.kallsyms]              [k] mspin_lock                                                                                                â
   + mspin_lock                                                                                                                                                          â
   + __mutex_lock_slowpath                                                                                                                                               â
   + mutex_lock                                                                                                                                                          â
-   7.97%    locking-creat  [kernel.kallsyms]              [k] mutex_spin_on_owner                                                                                       â
   + mutex_spin_on_owner                                                                                                                                                 â
   + __mutex_lock_slowpath                                                                                                                                               â
   + mutex_lock                                                                                                     

Lower users count just shows the syscall entries.

Of course, the aim7 setup was running on a ramdisk, thus avoiding any IO
overhead in the traces.

Thanks,
Davidlohr

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