Re: [PATCH 2/6] PM: Asynchronous resume of devices

From: Alan Stern
Date: Sat Aug 29 2009 - 20:49:00 EST

On Sat, 29 Aug 2009, Rafael J. Wysocki wrote:

> I only wanted to say that the advantage is not really that "big". :-)
> > I must agree, 14 threads isn't a lot. But at the moment that number is
> > random, not under your control.
> It's not directly controlled, but there are some interactions between the
> async threads, the main threads and the async framework that don't allow this
> number to grow too much.
> IMO it sometimes is better to allow things to work themselves out, as long as
> they don't explode, than to try to keep everything under strict control. YMMV.

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.

Alan Stern

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