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

[Jon Masamitsu]

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.

Jon