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runtime: remove unused _GCsweep state

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We don't use this state. _GCoff means we're sweeping in the
background. This makes it clear in the next commit that _GCoff and
only _GCoff means sweeping.

Change-Id: I416324a829ba0be3794a6cf3cf1655114cb6e47c
Reviewed-on: https://go-review.googlesource.com/11501
Reviewed-by: Rick Hudson <rlh@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Austin Clements 2015-06-25 12:24:44 -04:00
parent 4e61c516f4
commit f73b2fca84
1 changed files with 3 additions and 5 deletions
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8
src/runtime/mgc.go
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@ -46,13 +46,12 @@
// 11. GC preempts P's one-by-one taking partial wbufs and marks all unmarked yet // 11. GC preempts P's one-by-one taking partial wbufs and marks all unmarked yet
// reachable objects. // reachable objects.
// 12. When GC completes a full cycle over P's and discovers no new grey // 12. When GC completes a full cycle over P's and discovers no new grey
// objects, (which means all reachable objects are marked) set phase = GCsweep. // objects, (which means all reachable objects are marked) set phase = GCoff.
// 13. Wait for all P's to acknowledge phase change. // 13. Wait for all P's to acknowledge phase change.
// 14. Now malloc allocates white (but sweeps spans before use). // 14. Now malloc allocates white (but sweeps spans before use).
// Write barrier becomes nop. // Write barrier becomes nop.
// 15. GC does background sweeping, see description below. // 15. GC does background sweeping, see description below.
// 16. When sweeping is complete set phase to GCoff. // 16. When sufficient allocation has taken place replay the sequence starting at 0 above,
// 17. When sufficient allocation has taken place replay the sequence starting at 0 above,
// see discussion of GC rate below. // see discussion of GC rate below.
// Changing phases. // Changing phases.
@ -241,12 +240,11 @@ var gcBlackenEnabled uint32
var gcBlackenPromptly bool var gcBlackenPromptly bool
const ( const (
_GCoff = iota // GC not running, write barrier disabled _GCoff = iota // GC not running; sweeping in background, write barrier disabled
_GCstw // unused state _GCstw // unused state
_GCscan // GC collecting roots into workbufs, write barrier ENABLED _GCscan // GC collecting roots into workbufs, write barrier ENABLED
_GCmark // GC marking from workbufs, write barrier ENABLED _GCmark // GC marking from workbufs, write barrier ENABLED
_GCmarktermination // GC mark termination: allocate black, P's help GC, write barrier ENABLED _GCmarktermination // GC mark termination: allocate black, P's help GC, write barrier ENABLED
_GCsweep // GC mark completed; sweeping in background, write barrier disabled
) )
//go:nosplit //go:nosplit