Review request: (turn off transparent huge pages) 8024838: Significant slowdown due to transparent huge pages

[Jesper Wilhelmsson]

Looks good!

Is there a reason to why you chose not to use SET_FLAG_ERGO when updating the 
flags? If not I would prefer if the macro was used.
/Jesper


Stefan Karlsson skrev 3/10/13 9:40 PM:
> Please review this change to turn off transparent huge pages by default.
>
> http://cr.openjdk.java.net/~stefank/8024838/webrev.00/
>
> 8024838: Significant slowdown due to transparent huge pages
> Summary: Don't turn on transparent huge pages (-XX:+UseTransparentHugePages)
> unless explicitly specified on the command line. This has the effect that large
> pages are never turned on Linux unless the user has explicitly enabled any of
> the large pages flags: -XX:+UseLargePages, -XX:+UseTransparentHugePages,
> -XX:+UseHugeTLBFS, and -XX:+UseSHM.
> Reviewed-by: TBD1, TBD2
>
> thanks,
> StefanK