Review Request for 6878481: Add performance counters in the JDK

[David Holmes - Sun Microsystems]

Just to add 2c to Alan's method naming comments:

Alan Bateman said the following on 09/13/09 18:07:
> Method naming is hard (and often subjective) but there are updates like 
> this:
>  PerfCounter.getParentDelegationTime.inc(t1 - t0);
> which might be easier to read as:
>  PerfCounter.getParentDelegationCounter().addTime(t1 - t0)

There's always a problem with method naming when a thing can be both a 
counter and a time-tracker. I would agree to use context specific 
methods even at the expense of some redundancy in the public API eg:

addTime(long interval)
addElapsedTimeFrom(long startTime)

> Also:
>  PerfCounter.getZipFileCount().inc();
> which might be cleaer as:
>  PerfCounter.getZipFileCounter().increment();

I'd also suggest (in a convention used elsewhere eg 
java.util.concurrent.atomic.*) that you reserve increment() for addition 
of 1 and use add(long val) for the general case.

> Just a suggestion of course. Otherwise, looks okay to me and I'm looking 
> forward to seeing the output once these changes are in.

Agreed - all looks good.

Thanks,
David