Request for code review (M) - 8081629: CMS split_block() does not correctly fix up block-offset-table for large blocks
thomas.schatzl at oracle.com
Wed Jul 8 10:34:54 UTC 2015
sorry for the late review...
On Mon, 2015-06-22 at 12:57 -0700, Jon Masamitsu wrote:
> This bug is causing large young GC times for ParNew when
> there are large objects in the heap and the logarithmic strides
> are being used (badly).
> The change in webrev_min corrects the problem
> with the minimum code change (least risk).
> A rewriting of split_block() in included in a second webrev
> I've willing to go with the minimum change but could also
> be encouraged to push the rewrite of split_block().
> Vote for the one you like with your code review.
Voting for webrev.02 as it seems easier to understand to me.
I would suggest to fix one comment in both version that read
// Fill in the remainder of this "power block", if it
// is non-null.
replacing non-null by "empty". A "null" range seems confusing to me in
Both seem okay to me (with some extra spaces in line 469 that should be
fixed before pushing in the "min" fix).
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