add pointer writebarrier note

2018-03-07 17:16:15 -08:00 · 2018-03-07 17:16:15 -08:00 · 8d41f4151b
commit 8d41f4151b
parent 5ce6c4141c
1 changed files with 1 additions and 0 deletions
--- a/performance.md
+++ b/performance.md
@ -769,6 +769,7 @@ allocate it. But you also pay every time the garbage collection runs.
  * pointer-free map keys
 * GOGC
 * buffer reuse (sync.Pool vs or custom via go-slab, etc)
+* slicing vs. offset: pointer writes while GC is running need writebarrier: https://github.com/golang/go/commit/b85433975aedc2be2971093b6bbb0a7dc264c8fd

 ## Runtime and compiler