RFR(XS): 8204136: jtreg: Fix failing RTM test RTMSpinLoopCount

[Igor Ignatyev]

Hi Gustavo,

the fix looks reasonable to me.

Thanks,
-- Igor 

> On May 30, 2018, at 7:05 PM, Gustavo Romero <gromero at linux.vnet.ibm.com> wrote:
> 
> Hi,
> 
> Could the following change be reviewed please?
> 
> webrev: http://cr.openjdk.java.net/~gromero/8204136/v1
> bug   : https://bugs.openjdk.java.net/browse/JDK-8204136
> 
> It throttles down RTMSpinLoopCount deltas in TestRTMSpinLoopCount to avoid
> a test timeout. Using current RTMSpinLoopCount values mostly makes the last
> tries fail (RTMSpinLoopCount = 1_000_000 or 10_000_000). The proposed
> increment is to make the next RTMSpinLoopCount value 10x greater than the
> previous one.
> 
> Currently RTMSpinLoopCount can fail (error) sometimes due to timeout.
> (Please see: http://cr.openjdk.java.net/~gromero/misc/moog_spincountloop_timeout.log)
> 
> The JVM behavior seems correct and indeed high RTMSpinLoopCount values
> like 10_000_000 should take a long time to complete (> 2 minutes).
> 
> Thank you.
> 
> 
> Best regards,
> Gustavo
>