Re: [PATCH 10] PM: Measure suspend and resume times for individualdevices (was: Re: [PATCH 2/6] PM: Asynchronous resume of devices)

[Alan Stern]

On Sun, 30 Aug 2009, Rafael J. Wysocki wrote:

> > > For testing purposes it would be nice to have a one-line summary for
> > > each device containing a thread ID, start timestamp, end timestamp, and
> > > elapsed time.  With that information you could evaluate the amount of
> > > parallelism and determine where the bottlenecks are.  It would give a
> > > much more detailed picture of the entire process than the total time of
> > > your recent patch 9.
> > 
> > Of course it would.  I think I'll implement it.
> 
> OK, below is a patch for that.  It only prints the time elapsed, because the
> timestamps themselves can be obtained from the usual kernel timestamping.

Does that include the start timestamps?  I don't see them anywhere in
the patch.  Without the start timestamps we have no way to know how
much time was spent waiting for dpm_list_mtx or other resources as
opposed to actually carrying out the operation.

Alan Stern


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