[9] RFR (S): 8068183: Add isTieredSupported method to c.o.j.t.Platforms

[Filipp Zhinkin]

Vladimir, thank you for review.

Regards,
Filipp.

On 12/24/2014 07:31 PM, Vladimir Kozlov wrote:
> Looks good.
>
> Thanks,
> Vladimir
>
> On 12/24/14 6:22 AM, Filipp Zhinkin wrote:
>> Hi all,
>>
>> please review a new c.o.j.t.Platform's method "isTieredSupported"
>> which is aimed to report whether or not JVM supports tiered compilation
>> disregard to TieredCompilation flag's value.
>>
>> Such functionality is required for Segmented Code Cache CLI tests [1]
>> and it would be useful in other cases too ([2] for instance).
>>
>> In order to check if tiered compilation is supported we simply look to
>> "sun.management.compiler"property's valuewhich will contain
>> "Tiered Compilers" substring only when tiered compilation is supported [3].
>>
>> Bug id: https://bugs.openjdk.java.net/browse/JDK-8068183
>> Webrev: http://cr.openjdk.java.net/~fzhinkin/8068183/webrev.00/
>> Testing: manual on localmachine using both client & server JVMs.
>>
>> Thanks,
>> Filipp.
>>
>> [1] 
>> http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2014-December/016717.html
>> [2] https://bugs.openjdk.java.net/browse/JDK-8067823
>> [3] 
>> http://hg.openjdk.java.net/jdk9/jdk9/hotspot/file/7f062b70a344/src/share/vm/prims/jvm.cpp#l366