doc/go1.15: add release notes for new linker
Add a blurb to the release notes describing improvements made to the
Go linker in the most recent development cycle.
Updates #37419.
Change-Id: I3b870f0c00efc0b7b33aab2631d8c4e1c273922d
Reviewed-on: https://go-review.googlesource.com/c/go/+/236159
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/doc/go1.15.html b/doc/go1.15.html
index d89769e..37fa76c6 100644
--- a/doc/go1.15.html
+++ b/doc/go1.15.html
@@ -209,8 +209,34 @@
updated to satisfy the safety rules.
</p>
-<p><!-- CL 231497 -->
- TODO: <a href="https://golang.org/cl/231497">https://golang.org/cl/231497</a>: merge branch 'dev.link' into master
+<h2 id="linker">Linker</h2>
+
+<p>
+ This release includes substantial improvements to the Go linker,
+ which reduce linker resource usage (both time and memory) and
+ improve code robustness/maintainability.
+</p>
+
+<p>
+ For a representative set of large Go programs, linking is 20% faster
+ and requires 30% less memory on average, for <code>ELF</code>-based
+ OSes running on <code>amd64</code> architectures, with more modest
+ improvements for other architecture/OS combinations.
+</p>
+
+<p>
+ The key contributors to better linker performance are a newly
+ redesigned object file format, and a revamping of internal
+ phases to increase concurrency (for example, applying relocations to
+ symbols in parallel). Object files in Go 1.15 are slightly larger
+ than their 1.14 equivalents.
+</p>
+
+<p>
+ These changes are part of a multi-release project
+ to <a href="https://golang.org/s/better-linker">modernize the Go
+ linker</a>, meaning that there will be additional linker
+ improvements expected in future releases.
</p>
<h2 id="library">Core library</h2>
