review(S): 7037939: NUMA: Disable adaptive resizing if SHM large pages are used

[Y. Srinivas Ramakrishna]

Looks good to me.

-- ramki

On 4/21/2011 2:22 PM, Igor Veresov wrote:
> The fix has two parts:
> 1. On Solaris, when ISM shared memory is used it is always allocated round-robin across the nodes,
> so the NUMA allocator cannot work. The fix is to disable UseNUMA if ISM method is selected. I let
> UseNUMA win however if UseLargePages and UseSHM are not explicitly specified.
>
> 2. On Linux, it's impossible to use adaptive resizing with UseNUMA if SHM shared memory is used.
> That is because we cannot uncommit a page in such a mmaping. The solution is to disable adaptive
> resizing if the userr really wants it, that is when UseNUMA and (UseLargePages or UseSHM) are
> specified on the command line. Like on Solaris, I let UseNUMA win if it's explicitly specified and
> UseLargePages and UseSHM are not.
>
>
> Webrev: http://cr.openjdk.java.net/~iveresov/7037939/webrev.00/
>
>
> Thanks,
> igor