RFR(XS): 8193509: Test dynamic path to retrieve active processor count.

[David Holmes]

Hi Goetz,

On 14/12/2017 10:06 PM, Lindenmaier, Goetz wrote:
> Hi,
> 
> active_processor_count() in os_linux.cpp has two paths, one is only
> excercised if the VM runs on a machine with more than 1024 processors.
> Flag UseCpuAllocPath allows to force this path. Add a test with
> this flag to excercise this code.

Not sure I see the value in having a test for this. Where would this 
test run such that it would show us there is some problem that needs 
fixing? The real test of that code path is on a machine with > 1024 
processors.

That aside please reformat the

   29  * @summary If #processors > 1024 os_linux.cpp uses special 
coding. Excercise this by forcing usage of this coding. If this fails, 
this VM was either compiled on a platform which does not define 
CPU_ALLOC, or it is executed on a platform that does not support it.

to use multiple lines. Though a simple:

@summary  Test the UseCpuAllocPath code path

would suffice IMHO.

And the name of the test should more accurately be TestUseCpuAllocPath.

> Please review this change. I please need a sponsor. (Do I need one with the new repo setup?)
> http://cr.openjdk.java.net/~goetz/wr17/8193509-activeProcTest/webrev.01/

The need for a sponsor is not related to the repo setup, but the need 
for adequate cross-platform testing. If the set of platforms you've 
tested on includes all the platforms Oracle would test on, then a 
sponsor would not add anything to the equation. But your RFR needs to 
include what testing you have done.

Thanks,
David

> Best regards,
>    Goetz.
>