Hello,
I spent a lot of time to find the reason of a "memory leak" which did not exist. There was a fundamental misunderstanding about memory management. We thought that the garbage collector returns unused heap memory back to the operating system, which was wrong.

The explanation is in #41444 (comment) :
"Since the Go garbage collector is designed to retain about twice as much memory as your live heap size, debug.FreeOSMemory is expected to free about half of your memory"

Would you please add this information to https://tip.golang.org/doc/gc-guide ?

I think is is very important to know.