RFR (S): 8244815: Always log MMU information in G1

[Kim Barrett]

> On May 12, 2020, at 10:39 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi,
> 
> On 12.05.20 16:20, stefan.johansson at oracle.com wrote:
>> Hi,
>> On 2020-05-12 15:53, Thomas Schatzl wrote:
>>> Hi all,
>>> 
> [...]
> 
>>> There is some a bit ugly code to select the correct message level. Maybe there is a better way. An alternative would be to move the message to debug level always?
>>> 
>> I would prefer a simple else clause doing the debug logging. Any problem with that? We could also split the logging into a helper, something like:
>> void G1MMUTrackerQueue::log_mmu(double slice_time) {
>>   double used_time = slice_time * 1000.0;
>>   double max_time = _max_gc_time * 1000.0;
>>   double interval = _time_slice * 1000;
>>   if (slice_time >= _max_gc_time) {
>>     log_info(gc, mmu)("MMU target violated: %.1lfms (%.1lfms/%.1lfms)",
>>                       used_time, max_time, interval);
>>   } else {
>>     log_debug(gc, mmu)("MMU: %.1lfms (%.1lfms/%.1lfms)",
>>                        used_time, max_time, interval);
>>   }
>> }
>> What do you think about that?
> 
> I am okay with that and that has mostly been my initial solution, but was concerned about the code duplication.
> 
> New webrev at http://cr.openjdk.java.net/~tschatzl/8244815/webrev.1/
> 
> Thanks,
>  Thomas

Looks good.