4396ea96c4
Channels and sync.Mutex'es allow another goroutine to acquire resource ahead of an unblocked goroutine. This is good for performance, but leads to futile wakeups (the unblocked goroutine needs to block again). Futile wakeups caused user confusion during the very first evaluation of tracing functionality on a real server (a goroutine as if acquires a mutex in a loop, while there is no loop in user code). This change detects futile wakeups on channels and emits a special event to denote the fact. Later parser finds entire wakeup sequences (unblock->start->block) and removes them. sync.Mutex will be supported in a separate change. Change-Id: Iaaaee9d5c0921afc62b449a97447445030ac19d3 Reviewed-on: https://go-review.googlesource.com/7380 Reviewed-by: Keith Randall <khr@golang.org> |
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The Go Programming Language
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Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this file). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install-source.html). You should also add the Go binary directory $GOROOT/bin to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile:
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