[sheepdog] [PATCH 0/5] add graph stat function

[MORITA Kazutaka]

At Sat, 10 Aug 2013 22:21:06 +0800,
Liu Yuan wrote:
> 
> This patch set add a new command 'graph stat', this is useful to get how much
> time each function spends in a top style view.
> 
> For a simple glance, we can see that our event_loop is doing too much.
> 
> $ collie trace graph stat
>    Function Name                    |  Time(ms)
> --------------------------------------------------
> eventfd_xread                       | 110817.996257
> do_process_work                     | 87415.051934
> do_push_object                      | 84434.906931
> push_cache_object                   | 84426.040582
> gateway_create_and_write_obj        | 82382.884469
> exec_local_req                      | 82038.293182
> gateway_forward_request             | 81968.317720
> event_loop                          | 48661.499542
> do_event_loop                       | 48650.993934
> xpwrite                             | 38091.275768
> sheep_do_op_work                    | 36608.988329
> peer_create_and_write_obj           | 36608.802587
> default_create_and_write            | 36607.231493
> object_cache_push                   | 28783.994126
> do_background_push                  | 27332.938972
> local_release_vdi                   | 3455.208848
> object_cache_flush_vdi              | 3452.805846
> read_cache_object_noupdate          | 2309.550495
> ...

Thanks, I think of trying to implement the similar feature.  How about
printing the number of calls for each function, too?  I think it would
help us to profile a bottleneck.

Thanks,

Kazutaka