Request for Review (xs) - 8159073: Error handling incomplete when creating GC threads lazily

[Thomas Schatzl]

Hi Jon,

On Thu, 2016-07-21 at 06:48 -0700, Jon Masamitsu wrote:
> 
> On 7/21/2016 1:20 AM, Thomas Schatzl wrote:
> > 
> > Hi Jon,
> > 
> > On Wed, 2016-07-20 at 20:43 -0700, Jon Masamitsu wrote:
> > > 
> > > It's ready again.
> > > 
> > > Delta: http://cr.openjdk.java.net/~jmasa/8159073/webrev_delta_01_
> > > 02/
> > > Full: http://cr.openjdk.java.net/~jmasa/8159073/webrev.02/
> > > 
> >    this looks good, except for the two log messages. They seem to
> > be
> > superfluous because first the callers of run_task(, uint) already
> > print
> > mostly the same message, and the given code guarantee's that
> > whatever
> > is printed anyway. Further, a single invocation of run_task will
> > now
> > trigger three messages basically telling the same.
> > 
> > So I would prefer if these messages were either moved to trace
> > level,
> > or just removed.
> > 
> > Thanks a lot for your patience with me, :)
> >    Thomas
> I deleted the log messages.
> 
> --- a/src/share/vm/gc/shared/workgroup.cpp
> +++ b/src/share/vm/gc/shared/workgroup.cpp
> @@ -272,11 +272,9 @@
>               task->name(), num_workers, total_workers());
>     guarantee(num_workers > 0, "Trying to execute task %s with zero 
> workers", task->name());
>     uint old_num_workers = _active_workers;
> -  log_debug(gc)("run_task: updating active workers for %s from %u
> to 
> %u", task->name(), old_num_workers, num_workers);
>     update_active_workers(num_workers);
>     guarantee(_active_workers == num_workers, "active workers %u 
> num_workers %u", _active_workers, num_workers);
>     _dispatcher->coordinator_execute_on_workers(task, num_workers);
> -  log_debug(gc)("run_task: restoring active workers from %u to %u", 
> num_workers, old_num_workers);
>     update_active_workers(old_num_workers);
>   }
> 
> Delta: http://cr.openjdk.java.net/~jmasa/8159073/webrev_delta_02_03/
> Full: http://cr.openjdk.java.net/~jmasa/8159073/webrev.03/
> 
> Thanks.

  looks good, ship it :) 

Thanks,
  Thomas