RFR: Bitmap size might not be page aligned when large page is used

[Aleksey Shipilev]

On 01/18/2018 01:39 AM, Zhengyu Gu wrote:
> I discovered this when running tests for idling regions.
> 
> #  Out of Memory Error
> (/home/zgu/workspace/shenandoah-jdk10/src/hotspot/os/linux/os_linux.cpp:2598), pid=23493, tid=23494
> #
> # JRE version:  (10.0) (fastdebug build )
> # Java VM: OpenJDK 64-Bit Server VM (fastdebug 10-internal+0-adhoc.zgu.shenandoah-jdk10, mixed mode,
> aot, tiered, compressed oops, Shenandoah gc, linux-amd64)
> # Core dump will be written. Default location:
> /home/zgu/workspace/shenandoah-jdk10/test/hotspot/jtreg/gc/arguments/core.%p
> #
> 
> This bug is only reproducible when large pages are actually used (when system has enough large pages)
> 
> http://cr.openjdk.java.net/~zgu/shenandoah/bitmap_size_large_page/webrev.00/

D'uh. Looks good!

-Aleksey