RFR: 8244291: Test: gc/z/TestGarbageCollectorMXBean.java failed: "unexpected cycles"

[Per Liden]

Thanks Erik!

/Per

On 5/20/20 9:48 AM, Erik Österlund wrote:
> +1
> 
> /Erik
> 
> On 2020-05-19 22:20, Per Liden wrote:
>> The test gc/z/TestGarbageCollectorMXBean.java has failed once on 
>> Windows (out of several thousands of runs) in our CI. I've been unable 
>> to reproduce the problem, and code inspection has not reviled anything 
>> suspicious. The only explanation that seems semi-plausible is that the 
>> the Notification thread was severely starved on CPU and didn't manage 
>> to send notifications in a timely manner.
>>
>> This patch extends the notification timeout from 60 to 90 seconds, and 
>> adds additional logging with timestamps, which will hopefully help us 
>> understand the problem a bit better if it ever happens again.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8244291
>> Webrev: http://cr.openjdk.java.net/~pliden/8244291/webrev.0
>>
>> /Per
>