internal/buildcfg: disable sizespecializedmalloc by default

We're finding some regressions in overall icache footprint at scale and
we should figure out how to deal with those before rolling this out to
everybody.

Change-Id: I98e792db31712bf64575d76dfeafedb48898f76a
Reviewed-on: https://go-review.googlesource.com/c/go/+/738780
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>

diff --git a/src/internal/buildcfg/exp.go b/src/internal/buildcfg/exp.go
index df41f79338841fb6a88d45b842625c6388c0dd61..aa41986e8e9387ca5c71cf43362bd6cf2ac76cee 100644 (file)
--- a/src/internal/buildcfg/exp.go
+++ b/src/internal/buildcfg/exp.go
@@ -81,12 +81,11 @@ func ParseGOEXPERIMENT(goos, goarch, goexp string) (*ExperimentFlags, error) {
        dwarf5Supported := (goos != "darwin" && goos != "ios" && goos != "aix")
 
        baseline := goexperiment.Flags{
-               RegabiWrappers:        regabiSupported,
-               RegabiArgs:            regabiSupported,
-               Dwarf5:                dwarf5Supported,
-               RandomizedHeapBase64:  true,
-               SizeSpecializedMalloc: true,
-               GreenTeaGC:            true,
+               RegabiWrappers:       regabiSupported,
+               RegabiArgs:           regabiSupported,
+               Dwarf5:               dwarf5Supported,
+               RandomizedHeapBase64: true,
+               GreenTeaGC:           true,
        }
        flags := &ExperimentFlags{
                Flags:    baseline,