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runtime: note about improved _Gscan bit handling

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Change-Id: I8de5aa64a24e77e0ef876918fcace7668769ebc2
Reviewed-on: https://go-review.googlesource.com/c/go/+/171022
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Austin Clements 2019-04-03 16:32:42 -04:00
parent d86c35e523
commit 0188cb0e8a
1 changed files with 7 additions and 0 deletions
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7
src/runtime/runtime2.go
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@ -22,6 +22,13 @@ const (
// If you add to this list, add to the list
// of "okay during garbage collection" status
// in mgcmark.go too.
//
// TODO(austin): The _Gscan bit could be much lighter-weight.
// For example, we could choose not to run _Gscanrunnable
// goroutines found in the run queue, rather than CAS-looping
// until they become _Grunnable. And transitions like
// _Gscanwaiting -> _Gscanrunnable are actually okay because
// they don't affect stack ownership.
// _Gidle means this goroutine was just allocated and has not
// yet been initialized.