RFR: 8027960: Assertion assert(end >= start) failed during nightly testing on solaris

Thomas Schatzl thomas.schatzl at oracle.com
Mon Nov 11 09:02:41 UTC 2013

Hi Jon,

On Fri, 2013-11-08 at 10:52 -0800, Jon Masamitsu wrote:
> Stefan,
> Change looks good.
> There are _gen_alignments and _space_alignments in CollectorPolicy.
> Where those are initialized there is no calculation of a new_alignment
> based on page size.  For example,
> void MarkSweepPolicy::initialize_alignments() {
>    _space_alignment = _gen_alignment = (uintx)Generation::GenGrain;
>    _heap_alignment = compute_heap_alignment();
> }
> Should those places be calculating and using a new_alignment?

  I am not completely sure what the question is, and whether Jesper's
reply already replied or not, but as far as I can tell the question
seems to be why the MarkSweepPolicy (for serial gc) does not take page
size into account for space and generation alignment.

As far as I know, only Parallel GC ever did that as it is also the only
collector that is NUMA aware, so I assume this is the reason why that
collector does. All collectors align the heap alignment to large page
size though if large pages are used.

Not really an answer, I know - but we can make an rfe/bug from it I


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