RFR 8134995(M): [REDO] GC: implement ranges (optionally constraints) for those flags that have them missing

Zoltán Majó zoltan.majo at oracle.com
Fri Sep 25 06:36:32 UTC 2015

Hi Sangheon,

I spotted a small issue in TestG1HeapRegionSize.java: You've left a 
println statement in the code (although you've commented it out).

58 //System.out.println(stdout);

Otherwise it looks good to me.

Thank you and best regards,


On 09/11/2015 02:01 AM, sangheon.kim wrote:
> Hi all,
> Please review this patch for command-line validation for GC flags.
> This REDO patch is adding ranges and implementing constraint functions 
> for GC flags.
> Original CR of JDK-8078555 was backout as it made a test failure from 
> 'TestOptionsWithRanges.java'.
> And also there were some discussion of OOM handling.
> Most parts are same as JDK-8078555 except below:
> 1. Changed 'range' for some flags.
> 2. Excluded 3 flags for TestOptionsWithRanges.java test. These flags 
> make this test unstable as it tries to allocate huge amount of memory.
> And below are the suggestion note for JDK-8078555:
> 1. Exponential notation for 'double' type variable parse: Previously 
> there were some discussion for maximum value for double type flags 
> from code review of JDK-8059557 and JDK-8112746. And Kim and I decided 
> not to add upper limit unless there are problems with DBL_MAX. And as 
> 255 is the maximum length that can be passed via command-line, we 
> introduced exponential notation to avoid this limit. ( arguments.cpp )
> 2. These GC flags ranges are not ideal ranges but ranges which don't 
> make problem with current source code.
>     If one flag makes some problem but hard to find good range, I 
> added some ranges.
> 3. There are some constraint functions to avoid overflow.
> 4. Test applications are changed: as some of them assumed to be 
> ParallelGC or to check it's output messages.
> 5. Includes cleanup of JDK-8133565: GC -2nd followup to JDK-8059557.
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8134995
> Webrev:
> http://cr.openjdk.java.net/~sangheki/8134995/webrev.00/
> http://cr.openjdk.java.net/~sangheki/8134995/webrev.00_to_8078555
> Testing:
> JPRT, UTE(vm.quick-pcl) and 
> test/runtime/CommandLine/OptionsValidation/TestOptionsWithRanges.java.
> Thanks,
> Sangheon

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