runtime: account for tiny allocs, for testing.AllocsPerRun
Fixes #8734.
LGTM=r, bradfitz, dvyukov
R=bradfitz, r, dvyukov
CC=golang-codereviews, iant, khr
https://golang.org/cl/143150043
diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go
index acf6b48..fc22cc2 100644
--- a/src/runtime/malloc.go
+++ b/src/runtime/malloc.go
@@ -103,7 +103,6 @@
// standalone escaping variables. On a json benchmark
// the allocator reduces number of allocations by ~12% and
// reduces heap size by ~20%.
-
tinysize := uintptr(c.tinysize)
if size <= tinysize {
tiny := unsafe.Pointer(c.tiny)
@@ -121,6 +120,7 @@
x = tiny
c.tiny = (*byte)(add(x, size))
c.tinysize -= uintptr(size1)
+ c.local_tinyallocs++
if debugMalloc {
mp := acquirem()
if mp.mallocing == 0 {
