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Austin Clements 489620d878 runtime: drain local runq when dedicated mark worker runs 
When the dedicated mark worker runs, the scheduler won't run on that P
again until GC runs out of mark work. As a result, any goroutines in
that P's local run queue are stranded until another P steals them. In
a normally operating system this may take a long time, and in a 100%
busy system, the scheduler never attempts to steal from another P.

Fix this by draining the local run queue into the global run queue if
the dedicated mark worker has run for long enough. We don't do this
immediately upon scheduling the dedicated mark worker in order to
avoid destroying locality if the mark worker runs for a short time.
Instead, the scheduler delays draining the run queue until the mark
worker gets its first preemption request (and otherwise ignores the
preemption request).

Fixes #20011.

Change-Id: I13067194b2f062b8bdef25cb75e4143b7fb6bb73
Reviewed-on: https://go-review.googlesource.com/46610
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
2017-06-26 19:25:26 +00:00
.github doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
api api: promote next to go1.9 2017-06-14 21:07:10 +00:00
doc doc: add qualified mention of dep to FAQ 2017-06-20 16:07:41 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc cmd/cgo: match note following error in compiler errors 2017-06-14 17:07:19 +00:00
src runtime: drain local runq when dedicated mark worker runs 2017-06-26 19:25:26 +00:00
test cmd/compile: use correct variable when setting up dummy CallStmt in error 2017-06-26 18:39:37 +00:00
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.gitignore .gitignore: change path to zbootstrap.go 2017-04-19 02:13:58 +00:00
AUTHORS A+C: updated update 2017-06-20 23:27:06 +00:00
CONTRIBUTING.md doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
CONTRIBUTORS A+C: updated update 2017-06-20 23:27:06 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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