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doc/go1.16: document switch to MADV_DONTNEED

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Updates #42330.

Change-Id: Ifda10a5c3dca30acf1258e9e0af202e9beffc68e
Reviewed-on: https://go-review.googlesource.com/c/go/+/267137
Trust: Austin Clements <austin@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Austin Clements 2020-11-02 11:43:50 -05:00
parent d1efaed17a
commit 4fcb5068f6
1 changed files with 12 additions and 0 deletions
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doc/go1.16.html
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@ -161,6 +161,18 @@ Do not send CLs removing the interior tags from such phrases.
TODO
</p>
<p><!-- CL 267100 -->
On Linux, the runtime now defaults to releasing memory to the
operating system promptly (using <code>MADV_DONTNEED</code>), rather
than lazily when the operating system is under memory pressure
(using <code>MADV_FREE</code>). This means process-level memory
statistics like RSS will more accurately reflect the amount of
physical memory being used by Go processes. Systems that are
currently using <code>GODEBUG=madvdontneed=1</code> to improve
memory monitoring behavior no longer need to set this environment
variable.
</p>
<h2 id="compiler">Compiler</h2>
<p>