[9] RFR(XXS): 8068661: Exclude compiler/whitebox/ForceNMethodSweepTest.java from nightly runs

[David Chase]

I (not a Reviewer) approve this change and reasoning.

Is there a followup bug for someone somewhere else to fix the white box test package to get rid of these problems?

David

On 2015-01-08, at 6:46 AM, Albert Noll <albert.noll at oracle.com> wrote:

> Hi,
> 
> this fix excludes compiler/whitebox/ForceNMethodSweepTest.java from the nightly runs.
> The test is unstable for the following reasons:
> 
> A) The test is started with: -XX:CompileCommand=compileonly,SimpleTestCase$Helper::*
>    As a result, all methods of SimpleTestCase$Helper can be compiled. These include the following accessor methods:
>    SimpleTestCase$Helper.access$1400()I alive
>    SimpleTestCase$Helper.access$1300(LSimpleTestCase$Helper;)I alive
> 
>    Since background compilation is enabled, it is possible that methods of the class SimpleTestCase$Helper are compiled just after (3) is executed.
> 
>    1) int afterCompilation = getTotalUsage();
>    2) Asserts.assertGT(afterCompilation, usage, "compilation should increase usage");
>    3) guaranteedSweep();
>    4) int afterSweep = getTotalUsage();
>    5) Asserts.assertLTE(afterSweep, afterCompilation, "sweep shouldn't increase usage");
> 
> B) Another possible problem is that we have class loading in (2). Since adapters are created eagerly, there is a potential allocation in the code cache for adapters. In the executions I observed, this was not a problem due to adapter sharing (there already exists an adapter, since a class that contains a method with the same signature was loaded before). However, there is no guarantee that adapter sharing will also make this test work in the future.
> 
> Here is the webrev:
> http://cr.openjdk.java.net/~anoll/8068661/webrev.00/
> 
> Thanks,
> Albert

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