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Michael Anthony Knyszek abf8e355a8 runtime: use MADV_FREE_REUSABLE on darwin 
Currently on darwin we use MADV_FREE, which unfortunately doesn't result
in a change in the process's RSS until pages actually get kicked out,
which the OS is free to do lazily (e.g. until it finds itself under
memory pressure).

To remedy this, we instead use MADV_FREE_REUSABLE which has similar
semantics, except that it also sets a reusable bit on each page so the
process's RSS gets reported more accurately. The one caveat is for every
time we call MADV_FREE_REUSABLE on a region we must call MADV_FREE_REUSE
to keep the kernel's accounting updated.

Also, because this change requires adding new constants that only exist
on darwin, it splits mem_bsd.go into mem_bsd.go and mem_darwin.go.

Fixes #29844.

Change-Id: Idb6421698511138a430807bcbbd1516cd57557c8
Reviewed-on: https://go-review.googlesource.com/c/go/+/159117
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
 		2019-03-04 18:28:52 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api text/scanner: don't liberally consume (invalid) floats or underbars 2019-02-20 20:23:28 +00:00
doc doc: make path platform dependent 2019-03-04 17:36:16 +00:00
lib/time time: read 64-bit data if available 2019-02-26 23:10:35 +00:00
misc misc/git: remove pre-commit file 2019-03-04 18:01:17 +00:00
src runtime: use MADV_FREE_REUSABLE on darwin 2019-03-04 18:28:52 +00:00
test cmd/compile: optimize math/bits.Div32 for arm64 2019-03-03 20:20:10 +00:00
.gitattributes
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: change email address for Elias Naur 2019-01-23 15:05:26 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: second round of updates for Go 1.12 2019-01-30 18:01:19 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
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README.md README: linkify some paths 2018-06-06 18:07:01 +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 thousands 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.