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runtime: implement runqdrain() for GC mark worker goroutines

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Revive CL 310149

Change-Id: Ib4714ea5b2ade32c0f66edff841a79d8212bd79a
Reviewed-on: https://go-review.googlesource.com/c/go/+/313009
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Trust: Michael Pratt <mpratt@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Andy Pan 2021-04-23 21:25:06 +08:00 • committed by Michael Pratt
parent f34fe8e370
commit 3b304ce7fe
3 changed files with 48 additions and 8 deletions
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3
src/runtime/runtime2.go
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@ -633,6 +633,9 @@ type p struct {
// unit and eliminates the (potentially large) scheduling
// latency that otherwise arises from adding the ready'd
// goroutines to the end of the run queue.
//
// Note that while other P's may atomically CAS this to zero,
// only the owner P can CAS it to a valid G.
runnext guintptr
// Available G's (status == Gdead)