RFR: 8214484: ZGC: Exclude SA tests ClhsdbJhisto and TestHeapDumpFor*

Aleksey Shipilev shade at redhat.com
Thu Nov 29 16:40:05 UTC 2018

On 11/29/18 5:26 PM, Per Liden wrote:
> Hi,
> On 11/29/18 4:48 PM, Aleksey Shipilev wrote:
>> On 11/29/18 4:34 PM, Per Liden wrote:
>>> On 11/29/18 4:17 PM, Aleksey Shipilev wrote:
>>>> On 11/29/18 4:07 PM, Per Liden wrote:
>>>>> There's no support for SA heap walking when using ZGC. Hence the tests for this should not execute
>>>>> when ZGC is enabled.
>>>>> Bug: https://bugs.openjdk.java.net/browse/JDK-8214484
>>>>> Webrev: http://cr.openjdk.java.net/~pliden/8214484/webrev.0
>>>> Looks good.
>>>> Stylistic: why not "!vm.gc.Z"?
>>> That has a slightly different meaning. vm.gc.Z will be true if -XX:+UseZGC is an "acceptable"
>>> option. For example, ZGC is supported by the build and no other GC was explicitly chosen. vm.gc will
>>> be "Z" if the test was explicitly executed with -XX:+UseZGC.
>>> So if we used !vm.gc.Z on a build with ZGC support, then the test would never execute, unless you
>>> also explicitly specified what GC to use.
>>> Yeah, I it's messy... I hope I got the details right there... ;)
>> Mmm. That's not what we see with TestFullGCCount test, for example, which has pre-existing check for
>> CMS, and our new check for Shenandoah:
>>   * @requires !(vm.gc.ConcMarkSweep & vm.opt.ExplicitGCInvokesConcurrent == true)
>>   * @requires !(vm.gc.Shenandoah & vm.opt.ExplicitGCInvokesConcurrent == true)
> Those @requires tags look wrong to me. With the above, the test will not be executed if you _only_
> supply -XX:+ExplicitGCInvokesConcurrent (and use the default GC). It will work as intended if you
> instead use:
>  @requires !(vm.gc == "ConcMarkSweep" & vm.opt.ExplicitGCInvokesConcurrent)
>  @requires !(vm.gc == "Shenandoah" & vm.opt.ExplicitGCInvokesConcurrent)
> Right?

Damn. Right. What a mess! Your current patch looks good then.


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