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runtime: delete unused lock ranks

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For #53789.

Change-Id: Ic7379afcfdcc47b541bac9b44b5bc6b43604fc0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/418714
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
This commit is contained in:
Austin Clements 2022-07-19 16:15:03 -04:00
parent 426ea5702b
commit ddfd639408
1 changed files with 12 additions and 43 deletions
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33
src/runtime/lockrank.go
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@ -83,10 +83,9 @@ const (
// Memory-related leaf locks
lockRankGlobalAlloc
lockRankPageAllocScav
// Other leaf locks
lockRankGFree
// Generally, hchan must be acquired before gscan. But in one specific
// case (in syncadjustsudogs from markroot after the g has been suspended
// by suspendG), we allow gscan to be acquired, and then an hchan lock. To
@ -96,16 +95,6 @@ const (
// hchan locks.
lockRankHchanLeaf
lockRankPanic
// Leaf locks with no dependencies, so these constants are not actually used anywhere.
// There are other architecture-dependent leaf locks as well.
lockRankNewmHandoff
lockRankDebugPtrmask
lockRankFaketimeState
lockRankTicks
lockRankRaceFini
lockRankPollCache
lockRankDebug
)
// lockRankLeafRank is the rank of lock that does not have a declared rank, and hence is
@ -165,19 +154,9 @@ var lockNames = []string{
lockRankMheapSpecial: "mheapSpecial",
lockRankGlobalAlloc: "globalAlloc.mutex",
lockRankPageAllocScav: "pageAlloc.scav.lock",
lockRankGFree: "gFree",
lockRankHchanLeaf: "hchanLeaf",
lockRankPanic: "panic",
lockRankNewmHandoff: "newmHandoff.lock",
lockRankDebugPtrmask: "debugPtrmask.lock",
lockRankFaketimeState: "faketimeState.lock",
lockRankTicks: "ticks.lock",
lockRankRaceFini: "raceFiniLock",
lockRankPollCache: "pollCache.lock",
lockRankDebug: "debugLock",
}
func (rank lockRank) String() string {
@ -244,17 +223,7 @@ var lockPartialOrder [][]lockRank = [][]lockRank{
lockRankMheap: {lockRankSysmon, lockRankScavenge, lockRankSweepWaiters, lockRankAssistQueue, lockRankCpuprof, lockRankSweep, lockRankPollDesc, lockRankSched, lockRankAllg, lockRankAllp, lockRankTimers, lockRankItab, lockRankReflectOffs, lockRankHchan, lockRankTraceBuf, lockRankFin, lockRankNotifyList, lockRankTraceStrings, lockRankMspanSpecial, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGcBitsArenas, lockRankRoot, lockRankTrace, lockRankSpanSetSpine, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankDefer, lockRankSudog, lockRankWbufSpans},
lockRankMheapSpecial: {lockRankSysmon, lockRankScavenge, lockRankAssistQueue, lockRankCpuprof, lockRankSweep, lockRankPollDesc, lockRankSched, lockRankAllg, lockRankAllp, lockRankTimers, lockRankItab, lockRankReflectOffs, lockRankHchan, lockRankTraceBuf, lockRankNotifyList, lockRankTraceStrings},
lockRankGlobalAlloc: {lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankSpanSetSpine, lockRankMheap, lockRankMheapSpecial},
lockRankPageAllocScav: {lockRankMheap},
lockRankGFree: {lockRankSched},
lockRankHchanLeaf: {lockRankGscan, lockRankHchanLeaf},
lockRankPanic: {lockRankDeadlock}, // plus any other lock held on throw.
lockRankNewmHandoff: {},
lockRankDebugPtrmask: {},
lockRankFaketimeState: {},
lockRankTicks: {},
lockRankRaceFini: {},
lockRankPollCache: {},
lockRankDebug: {},
}