RFR (M): 8153507: Improve Card Table Clear Task
mikael.gerdin at oracle.com
Thu Apr 28 14:41:27 UTC 2016
On 2016-04-28 13:15, Thomas Schatzl wrote:
> Hi all,
> during performance measurements of the Card Table Clear task it has
> been shown that the current way of distributing work is way too fine
> grained. Threads are stalling most of the time on the atomic cmpxchg
> during work distribution instead of doing work.
> This change tries to fix this by changing the way how the "dirty"
> regions are stored from a single linked list to a set of region
> indices, where the usual claim-by-chunks technique can be applied.
> Further using we can effectively limit the number of threads used by
> the API introduced by JDK-8155232.
> Third, by reorganizing the code into the g1RemSet files, clutter across
> the g1 code is minimized.
Overall looks good,
in g1RemSet.cpp, do you really need the scope here?
+ double start = os::elapsedTime();
+ phase_times->record_clear_ct_time((os::elapsedTime() - start) *
> jprt, vm.gc testlist
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