RFR: 8204476: Add additional statistics to CodeCache::print_summary

[Thomas Stüfe]

On Thu, Jun 7, 2018 at 9:37 AM, René Schünemann
<rene.schuenemann at gmail.com> wrote:
> Hi,
>
> can I please get a review for the following change:
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8204476
> Webrev: http://cr.openjdk.java.net/~goetz/wr18/rene/webrev_8204476/01/
>
> This change adds the following:
>
> (1) In CodeCache::print_summary prints the code cache full count for
> each code heap.
>
> (2) Adds additional counters to class CompileBroker:
>     _total_compiler_stopped_count: The number of times the compilation
> has been stopped.
>     _total_compiler_restarted_count: The number of times the
> compilation has been restarted.
>    This counters are also added to CodeCache::print_summary.
>
>
> Thank you,
> Rene

Hi Rene,

Apart from what Vladimir wrote:

- small nit: _total_compiler_restarted_count += 1;  ->
_total_compiler_restarted_count ++;

- Please either use %d for printing int or change the type to
uint32_t. But seeing that the other counters are int, I would use %d.

- More of a question to others: I am not familiar with compiler
coding, but signed int as counters seem a bit small? Is there no
danger of ever overflowing on long running VMs? Or does it not matter
if they do?

Thanks, Thomas