RFR: 8059216: Make PrintGCApplicationStoppedTime print information about starting threads

[Vladimir Kempik]

Hello

Can I have a couple of reviews for this please?

Thanks, Vladimir.
On 20.10.2014 17:32, Vladimir Kempik wrote:
> Hi,
>
> Please review patch for improvement in PrintGCApplicationStoppedTime 
> logging:
>
> http://cr.openjdk.java.net/~vkempik/8059216/webrev.00
> https://bugs.openjdk.java.net/browse/JDK-8059216
>
> Sometimes GC kicks in much later than safepoint start time.
> And  without -XX:+PrintGCApplicationConcurrentTime it's may be not 
> clear why that happens.
> The patch adds more logging to PrintGCApplicationStoppedTime to show 
> how much time it took to stop all threads.
>
> Example of log after applying patch:
>
> 0,153: Application time: 0,0431575 seconds    (printed by 
> -XX:+PrintGCApplicationConcurrentTime)
> 0,619: #1: [GC remark 0,619: #1: [Finalize Marking, 0,0001732 secs]
> 0,619: #1: [GC ref-proc, 0,0001122 secs] 0,619: #1: [Unloading, 
> 0,0006922 secs]
> 0,620: #1: [GC aggregate-data, 0,0004849 secs], 0,0015962 secs]
>  [Times: user=0,00 sys=0,00 real=0,00 secs]
> 0,620: Total time for which application threads were stopped: 
> 0,4673289 seconds, Stopping threads took: 0,4656409 seconds
>
> Testing: JPRT.
>
> Thanks,
> Vladimir.