RFR(s): 8236042: [TESTBUG] serviceability/sa/ClhsdbCDSCore.java fails with -Xcomp -XX:TieredStopAtLevel=1

[Vladimir Kozlov]

Fix is good.

I think next are reasons you don't get MDO in this scenario.

Tier1 (C1 compilation) does not generate profiling code and does not created MDO. C1 request MDO only with tiers 2 and 3 
[1][2].

With -Xcomp flag a Java method is not executed in Interpreter but requests its compilation and waits when it is 
finished. As result MDO is not created in Interpreter too. May be late if a method is deoptimized it will be executed in 
Interpreter and MDO will be created.

Thanks,
Vladimir

[1] http://hg.openjdk.java.net/jdk/jdk/file/796c9fa50850/src/hotspot/share/c1/c1_Compilation.hpp#l226
[2] http://hg.openjdk.java.net/jdk/jdk/file/796c9fa50850/src/hotspot/share/c1/c1_Compilation.cpp#l381

On 7/7/20 8:47 PM, Fairoz Matte wrote:
> Thanks Chris, for the review comments.
> 
> I have updated the suggested change.
> 
> Thanks,
> Fairoz
> 
>> -----Original Message-----
>> From: Chris Plummer
>> Sent: Wednesday, July 8, 2020 3:38 AM
>> To: Fairoz Matte <fairoz.matte at oracle.com>; hotspot-compiler-
>> dev at openjdk.java.net; serviceability-dev at openjdk.java.net
>> Subject: Re: RFR(s): 8236042: [TESTBUG] serviceability/sa/ClhsdbCDSCore.java
>> fails with -Xcomp -XX:TieredStopAtLevel=1
>>
>> Hi Fairoz,
>>
>> Looks good, except for the missing space in "if(testJavaOpts...".
>>
>> thanks,
>>
>> Chris
>>
>> On 7/7/20 7:49 AM, Fairoz Matte wrote:
>>> Hi,
>>>
>>> Please review this small test change to consider the scenario when there is no
>> "printmdo" output
>>>
>>> JBS - https://bugs.openjdk.java.net/browse/JDK-8236042
>>> Webrev - http://cr.openjdk.java.net/~fmatte/8236042/webrev.00/
>>>
>>> Thanks,
>>> Fairoz
>>