tree 7f5e05654a2fa4d3368d87539ec928a095f617a6
parent 3fcf18e25241253f23efbeebe77b2a4c4a7c54d3
author Mathieu Chartier <mathieuc@google.com> 1393264720 -0800
committer Mathieu Chartier <mathieuc@google.com> 1393294348 -0800

Card pre-cleaning.

We now pre-clean cards before the pause in the concurrent mark sweep
collectors. This provides substantial a pause time reduction for GC
iterations which have a lot of dirty cards. The only downside is a
slight GC time increase for large heaps.

Benchmark FormulaEvaluationActions.EvaluateAndApplyChanges:

Before:
Partial average pause: 5.47ms
Sticky average pause: 2.91ms
Total GC time: 25.8s

After:
Partial average pause: 1.98ms
Sticky average pause: 1.66ms
Total GC time: 27.0s

Benchmark score difference in the noise.

Change-Id: If9f01f8c1501f122e19432438108d48e723b332e