88e945fd23
Currently allocation checks the GC trigger speculatively during allocation and then triggers the GC without rechecking. As a result, it's possible for G 1 and G 2 to detect the trigger simultaneously, both enter startGC, G 1 actually starts GC while G 2 gets preempted until after the whole GC cycle, then G 2 immediately starts another GC cycle even though the heap is now well under the trigger. Fix this by re-checking the GC trigger non-speculatively just before actually kicking off a new GC cycle. This contributes to #11911 because when this happens, we definitely don't finish the background sweep before starting the next GC cycle, which can significantly delay the start of concurrent scan. Change-Id: I560ab79ba5684ba435084410a9765d28f5745976 Reviewed-on: https://go-review.googlesource.com/13025 Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org> |
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