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Meng Zhuo ea59ebd338 runtime: use vDSO for clock_gettime on linux/arm64 
Use the __vdso_clock_gettime fast path via the vDSO on linux/arm64 to
speed up nanotime and walltime. This results in the following
performance improvement for time.Now on Cavium ThunderX:

name     old time/op  new time/op  delta
TimeNow   442ns ± 0%   163ns ± 0%  -63.16%  (p=0.000 n=10+10)

And benchmarks on VDSO

BenchmarkClockVDSOAndFallbackPaths/vDSO         10000000 166 ns/op
BenchmarkClockVDSOAndFallbackPaths/Fallback     3000000 456 ns/op

Change-Id: I326118c6dff865eaa0569fc45d1fc1ff95cb74f6
Reviewed-on: https://go-review.googlesource.com/99855
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
 		2018-03-27 13:21:27 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: support Getwd on all BSDs 2018-02-13 15:41:19 +00:00
doc doc: first version of new contribute guide 2018-03-22 10:24:44 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc all: enable c-shared/c-archive support for freebsd/amd64 2018-03-21 21:56:20 +00:00
src runtime: use vDSO for clock_gettime on linux/arm64 2018-03-27 13:21:27 +00:00
test test/codegen: port tbz/tbnz arm64 tests 2018-03-24 09:35:53 +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.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.

Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.

Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

Download and Install

Binary Distributions

Official binary distributions are available at https://golang.org/dl/.

After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.

Install From Source

If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.

Contributing

Go is the work of hundreds of contributors. We appreciate your help!

To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.