ad7a6f8159
It's the job of the last sweeper to emit the GC pacer trace. The last
sweeper can identify themselves by reducing the count of sweepers, and
also seeing that there's no more sweep work.
Currently this identification is broken, however, because the last
sweeper doesn't check the state they just transitioned sweeping into,
but rather the state they transitioned from (one sweeper, no sweep work
left). By design, it's impossible to transition *out* of this state,
except for another GC to start, but that doesn't take this codepath.
This means lines like
pacer: sweep done at heap size ...
were missing from the gcpacertrace output for a long time.
This change fixes this problem by having the last sweeper check the
state they just transitioned sweeping to, instead of the state they
transitioned from.
Change-Id: I44bcd32fe2c8ae6ac6c21ba6feb2e7b9e17f60cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/670735
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 4.0 Attribution license.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
Download and Install
Binary Distributions
Official binary distributions are available at https://go.dev/dl/.
After downloading a binary release, visit https://go.dev/doc/install for installation instructions.
Install From Source
If a binary distribution is not available for your combination of operating system and architecture, visit https://go.dev/doc/install/source for source installation instructions.
Contributing
Go is the work of thousands of contributors. We appreciate your help!
To contribute, please read the contribution guidelines at https://go.dev/doc/contribute.
Note that the Go project uses the issue tracker for bug reports and proposals only. See https://go.dev/wiki/Questions for a list of places to ask questions about the Go language.