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Dmitriy Vyukov 9cbd2fb1aa runtime: remove locks from netpoll hotpaths
Introduces two-phase goroutine parking mechanism -- prepare to park, commit park.
This mechanism does not require backing mutex to protect wait predicate.
Use it in netpoll. See comment in netpoll.goc for details.
This slightly reduces contention between reader, writer and read/write io notifications;
and just eliminates a bunch of mutex operations from hotpaths, thus making then faster.

benchmark                             old ns/op    new ns/op    delta
BenchmarkTCP4ConcurrentReadWrite           2109         1945   -7.78%
BenchmarkTCP4ConcurrentReadWrite-2         1162         1113   -4.22%
BenchmarkTCP4ConcurrentReadWrite-4          798          755   -5.39%
BenchmarkTCP4ConcurrentReadWrite-8          803          748   -6.85%
BenchmarkTCP4Persistent                    9411         9240   -1.82%
BenchmarkTCP4Persistent-2                  5888         5813   -1.27%
BenchmarkTCP4Persistent-4                  4016         3968   -1.20%
BenchmarkTCP4Persistent-8                  3943         3857   -2.18%

R=golang-codereviews, mikioh.mikioh, gobot, iant, rsc
CC=golang-codereviews, khr
https://golang.org/cl/45700043
2014-01-22 11:27:16 +04:00
api api: update next.txt 2014-01-14 10:18:43 -08:00
doc doc: replace "private" with "unexported" in Effective Go. 2014-01-17 09:06:39 -08:00
include liblink: include missing pragmas for plan9 formatter 2014-01-22 06:23:19 +01:00
lib codereview: switch defaultcc to golang-codereviews 2013-12-20 10:53:50 -05:00
misc misc/cgo/testtls: make test less flaky 2014-01-21 19:44:51 -05:00
src runtime: remove locks from netpoll hotpaths 2014-01-22 11:27:16 +04:00
test cmd/gc: preserve qualified names of unexported methods in imports. 2014-01-21 22:55:50 -05:00
.hgignore .hgignore: remove duplicate entry 2013-12-12 19:01:50 -08:00
.hgtags tag go1.2 2013-12-02 09:06:41 +11:00
AUTHORS A+C: Maxim Khitrov (individual CLA) 2014-01-17 11:26:42 -05:00
CONTRIBUTORS A+C: Maxim Khitrov (individual CLA) 2014-01-17 11:26:42 -05:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS
README README: Fix installation instructions 2013-11-20 13:47:37 -08:00
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