diff options
Diffstat (limited to 'src/runtime/mgc.go')
| -rw-r--r-- | src/runtime/mgc.go | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/runtime/mgc.go b/src/runtime/mgc.go index d75893dc43..8c8f7d936b 100644 --- a/src/runtime/mgc.go +++ b/src/runtime/mgc.go @@ -320,11 +320,20 @@ var work struct { nwait uint32 // Number of roots of various root types. Set by gcMarkRootPrepare. + // + // nStackRoots == len(stackRoots), but we have nStackRoots for + // consistency. nDataRoots, nBSSRoots, nSpanRoots, nStackRoots int // Base indexes of each root type. Set by gcMarkRootPrepare. baseData, baseBSS, baseSpans, baseStacks, baseEnd uint32 + // stackRoots is a snapshot of all of the Gs that existed + // before the beginning of concurrent marking. The backing + // store of this must not be modified because it might be + // shared with allgs. + stackRoots []*g + // Each type of GC state transition is protected by a lock. // Since multiple threads can simultaneously detect the state // transition condition, any thread that detects a transition @@ -1368,6 +1377,11 @@ func gcMark(startTime int64) { throw("work.full != 0") } + // Drop allg snapshot. allgs may have grown, in which case + // this is the only reference to the old backing store and + // there's no need to keep it around. + work.stackRoots = nil + // Clear out buffers and double-check that all gcWork caches // are empty. This should be ensured by gcMarkDone before we // enter mark termination. |