runtime: add execution tracer v2 behind GOEXPERIMENT=exectracer2

[gostls13.git] / src / runtime / extern.go

diff --git a/src/runtime/extern.go b/src/runtime/extern.go
index cc88a659ca1b32ea97c1f6544cae7672ffbcf017..f8db296e6ba67f73290b0cd69be39f68247f4d86 100644 (file)
--- a/src/runtime/extern.go
+++ b/src/runtime/extern.go
@@ -188,6 +188,10 @@ It is a comma-separated list of name=val pairs setting these named variables:
        This increases tracer overhead, but could be helpful as a workaround or for
        debugging unexpected regressions caused by frame pointer unwinding.
 
+       traceadvanceperiod: the approximate period in nanoseconds between trace generations. Only
+       applies if a program is built with GOEXPERIMENT=exectracer2. Used primarily for testing
+       and debugging the execution tracer.
+
        asyncpreemptoff: asyncpreemptoff=1 disables signal-based
        asynchronous goroutine preemption. This makes some loops
        non-preemptible for long periods, which may delay GC and