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runtime: minor clarifications of markroot

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This puts the _Root* indexes in a more friendly order and tweaks
markrootSpans to use a for-range loop instead of its own indexing.

Change-Id: I2c18d55c9a673ea396b6424d51ef4997a1a74825
Reviewed-on: https://go-review.googlesource.com/14548
Reviewed-by: Rick Hudson <rlh@golang.org>
This commit is contained in:
Austin Clements 2015-09-14 14:28:09 -04:00
parent a1cad70a2f
commit 4ac4085f8e
2 changed files with 5 additions and 5 deletions
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7
src/runtime/mgc.go
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@ -126,13 +126,14 @@ const (
_DebugGC = 0
_ConcurrentSweep = true
_FinBlockSize = 4 * 1024
_RootData = 0
_RootBss = 1
_RootFinalizers = 2
_RootSpans0 = 3
_RootFlushCaches = 3
_RootSpans0 = 4
_RootSpansShards = 128
_RootFlushCaches = _RootSpans0 + _RootSpansShards
_RootCount = _RootFlushCaches + 1
_RootCount = _RootSpans0 + _RootSpansShards
// sweepMinHeapDistance is a lower bound on the heap distance
// (in bytes) reserved for concurrent sweeping between GC

3
src/runtime/mgcmark.go
View File

@ -121,8 +121,7 @@ func markrootSpans(gcw *gcWork, shard int) {
sg := mheap_.sweepgen
startSpan := shard * len(work.spans) / _RootSpansShards
endSpan := (shard + 1) * len(work.spans) / _RootSpansShards
for spanidx := startSpan; spanidx < endSpan; spanidx++ {
s := work.spans[spanidx]
for _, s := range work.spans[startSpan:endSpan] {
if s.state != mSpanInUse {
continue
}