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-rw-r--r--src/runtime/extern.go6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/runtime/extern.go b/src/runtime/extern.go
index f295b9b12c..58acbb3788 100644
--- a/src/runtime/extern.go
+++ b/src/runtime/extern.go
@@ -66,6 +66,12 @@ a comma-separated list of name=val pairs. Supported names are:
problem with allocfreetrace=1 in order to understand the type
of the badly updated word.
+ gccheckmark: setting gccheckmark=1 enables verification of the
+ garbage collector's concurrent mark phase by performing a
+ second mark pass while the world is stopped. If the second
+ pass finds a reachable object that was not found by concurrent
+ mark, the garbage collector will panic.
+
The GOMAXPROCS variable limits the number of operating system threads that
can execute user-level Go code simultaneously. There is no limit to the number of threads
that can be blocked in system calls on behalf of Go code; those do not count against