e95bc5fef7
The scheduler, work buffer's dispose, and write barriers can conspire to hide the a pointer from the GC's concurent mark phase. If this pointer is the only path to a large amount of marking the STW mark termination phase may take a lot of time. Consider the following: 1) dispose places a work buffer on the partial queue 2) the GC is busy so it does not immediately remove and process the work buffer 3) the scheduler runs a mutator whose write barrier dequeues the work buffer from the partial queue so the GC won't see it This repeats until the GC reaches the mark termination phase where the GC finally discovers the pointer along with a lot of work to do. This CL fixes the problem by having the mutator dispose of the buffer to the full queue instead of the partial queue. Since the write buffer never asks for full buffers the conspiracy described above is not possible. Updates #11694. Change-Id: I2ce832f9657a7570f800e8ce4459cd9e304ef43b Reviewed-on: https://go-review.googlesource.com/12840 Reviewed-by: Austin Clements <austin@google.com> |
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The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
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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 $HOME/go, you might put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See https://golang.org/doc/install or doc/install.html for more details.