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Austin Clements authored
Currently only a single P can run a fractional mark worker at a time. This doesn't let us spread out the load, so it gets concentrated on whatever unlucky P picks up the token to run a fractional worker. This can significantly delay goroutines on that P. This commit changes this scheduling rule so each P separately schedules fractional workers. This can significantly reduce the load on any individual P and allows workers to self-preempt earlier. It does have the downside that it's possible for all Ps to be in fractional workers simultaneously (an effect STW). Updates #21698. Change-Id: Ia1e300c422043fa62bb4e3dd23c6232d81e4419c Reviewed-on: https://go-review.googlesource.com/68574 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org>
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