faf187fb8e
When scavenging small amounts it's possible we over-scavenge by a significant margin since we choose to scavenge the largest spans first. This over-scavenging is never accounted for. With this change, we add a scavenge credit pool, similar to the reclaim credit pool. Any time scavenging triggered by RSS growth starts up, it checks if it can cash in some credit first. If after using all the credit it still needs to scavenge, then any extra it does it adds back into the credit pool. This change mitigates the performance impact of golang.org/cl/159500 on the Garbage benchmark. On Go1 it suggests some improvements, but most of that is within the realm of noise (Revcomp seems very sensitive to GC-related changes, both postively and negatively). Garbage: https://perf.golang.org/search?q=upload:20190131.5 Go1: https://perf.golang.org/search?q=upload:20190131.4 Performance change with both changes: Garbage: https://perf.golang.org/search?q=upload:20190131.7 Go1: https://perf.golang.org/search?q=upload:20190131.6 Change-Id: I87bd3c183e71656fdafef94714194b9fdbb77aa2 Reviewed-on: https://go-review.googlesource.com/c/160297 Reviewed-by: Austin Clements <austin@google.com> |
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