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runtime: guarantee no GOMAXPROCS update syscalls after GOMAXPROCS call
We already guarantee that no automatic updates to GOMAXPROCS occur after a GOMAXPROCS call returns. This is easily achieved by having the update goroutine double-check that updates are still allowed during STW before committing the new value. However, it is possible for sysmon to concurrently run defaultGOMAXPROCS to compute a new GOMAXPROCS value after GOMAXPROCS returns. This new value will be discarded later, but we'll still perform the system calls necessary to compute the new value. Normally this distinction doesn't matter, but if you want to sandbox a Go program, then you may want to disable GOMAXPROCS updates to reduce the system call footprint. A call to GOMAXPROCS will disable updates, but without a guarantee on when sysmon will observe the change it is somewhat fragile. Add explicit synchronization between GOMAXPROCS and sysmon to guarantee that sysmon won't run defaultGOMAXPROCS after GOMAXPROCS returns. The synchronization is a bit complex because we can't hold a mutex across STW, nor take a semaphore from sysmon, but the result isn't too bad. One oddity is that sched.customGOMAXPROCS and gomaxprocs are no longer updated in lockstep (even though both are protected by sched.lock), but I don't believe anything should depend on that. For #73193. Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-staticlockranking Change-Id: I6a6a636cff243a9b69ac1b5d2f98925648e60236 Reviewed-on: https://go-review.googlesource.com/c/go/+/677037 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Michael Pratt
parent
dd678172e3
commit
e481a08e0e
5 changed files with 103 additions and 34 deletions
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@ -39,10 +39,18 @@ func GOMAXPROCS(n int) int {
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lock(&sched.lock)
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ret := int(gomaxprocs)
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unlock(&sched.lock)
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if n <= 0 || n == ret {
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unlock(&sched.lock)
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return ret
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}
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// Set early so we can wait for sysmon befor STW. See comment on
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// computeMaxProcsLock.
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sched.customGOMAXPROCS = true
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unlock(&sched.lock)
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// Wait for sysmon to complete running defaultGOMAXPROCS.
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lock(&computeMaxProcsLock)
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unlock(&computeMaxProcsLock)
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stw := stopTheWorldGC(stwGOMAXPROCS)
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@ -51,7 +59,6 @@ func GOMAXPROCS(n int) int {
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// TODO(prattmic): this could use a nicer API. Perhaps add it to the
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// stw parameter?
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newprocs = int32(n)
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newprocsCustom = true
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startTheWorldGC(stw)
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return ret
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@ -91,7 +98,9 @@ func SetDefaultGOMAXPROCS() {
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// TODO(prattmic): this could use a nicer API. Perhaps add it to the
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// stw parameter?
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newprocs = procs
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newprocsCustom = false
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lock(&sched.lock)
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sched.customGOMAXPROCS = false
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unlock(&sched.lock)
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startTheWorldGC(stw)
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}
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@ -14,6 +14,7 @@ const (
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lockRankSysmon
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lockRankScavenge
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lockRankForcegc
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lockRankComputeMaxProcs
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lockRankUpdateMaxProcsG
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lockRankDefer
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lockRankSweepWaiters
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@ -91,6 +92,7 @@ var lockNames = []string{
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lockRankSysmon: "sysmon",
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lockRankScavenge: "scavenge",
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lockRankForcegc: "forcegc",
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lockRankComputeMaxProcs: "computeMaxProcs",
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lockRankUpdateMaxProcsG: "updateMaxProcsG",
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lockRankDefer: "defer",
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lockRankSweepWaiters: "sweepWaiters",
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@ -174,6 +176,7 @@ var lockPartialOrder [][]lockRank = [][]lockRank{
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lockRankSysmon: {},
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lockRankScavenge: {lockRankSysmon},
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lockRankForcegc: {lockRankSysmon},
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lockRankComputeMaxProcs: {lockRankSysmon},
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lockRankUpdateMaxProcsG: {lockRankSysmon},
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lockRankDefer: {},
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lockRankSweepWaiters: {},
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@ -191,11 +194,11 @@ var lockPartialOrder [][]lockRank = [][]lockRank{
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lockRankPollDesc: {},
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lockRankWakeableSleep: {},
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lockRankHchan: {lockRankSysmon, lockRankScavenge, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankWakeableSleep, lockRankHchan},
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lockRankAllocmR: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan},
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lockRankExecR: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan},
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lockRankSched: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR},
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lockRankAllg: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched},
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lockRankAllp: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched},
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lockRankAllocmR: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan},
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lockRankExecR: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan},
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lockRankSched: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR},
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lockRankAllg: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched},
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lockRankAllp: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched},
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lockRankNotifyList: {},
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lockRankSudog: {lockRankSysmon, lockRankScavenge, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankWakeableSleep, lockRankHchan, lockRankNotifyList},
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lockRankTimers: {lockRankSysmon, lockRankScavenge, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankTimers},
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@ -208,29 +211,29 @@ var lockPartialOrder [][]lockRank = [][]lockRank{
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lockRankUserArenaState: {},
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lockRankTraceBuf: {lockRankSysmon, lockRankScavenge},
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lockRankTraceStrings: {lockRankSysmon, lockRankScavenge, lockRankTraceBuf},
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lockRankFin: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
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lockRankSpanSetSpine: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
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lockRankMspanSpecial: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
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lockRankTraceTypeTab: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
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lockRankGcBitsArenas: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankMspanSpecial},
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lockRankProfInsert: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
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lockRankProfBlock: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
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lockRankProfMemActive: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
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lockRankProfMemFuture: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankProfMemActive},
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lockRankGscan: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture},
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lockRankStackpool: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
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lockRankStackLarge: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
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lockRankHchanLeaf: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankHchanLeaf},
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lockRankWbufSpans: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
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lockRankMheap: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans},
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lockRankMheapSpecial: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap},
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lockRankGlobalAlloc: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap, lockRankMheapSpecial},
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lockRankTrace: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap},
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lockRankTraceStackTab: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap, lockRankTrace},
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lockRankFin: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
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lockRankSpanSetSpine: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
|
||||
lockRankMspanSpecial: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
|
||||
lockRankTraceTypeTab: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
|
||||
lockRankGcBitsArenas: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankMspanSpecial},
|
||||
lockRankProfInsert: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
|
||||
lockRankProfBlock: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
|
||||
lockRankProfMemActive: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings},
|
||||
lockRankProfMemFuture: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankItab, lockRankReflectOffs, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankProfMemActive},
|
||||
lockRankGscan: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture},
|
||||
lockRankStackpool: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
|
||||
lockRankStackLarge: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
|
||||
lockRankHchanLeaf: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankHchanLeaf},
|
||||
lockRankWbufSpans: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan},
|
||||
lockRankMheap: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans},
|
||||
lockRankMheapSpecial: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap},
|
||||
lockRankGlobalAlloc: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap, lockRankMheapSpecial},
|
||||
lockRankTrace: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap},
|
||||
lockRankTraceStackTab: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankDefer, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollCache, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR, lockRankExecR, lockRankSched, lockRankAllg, lockRankAllp, lockRankNotifyList, lockRankSudog, lockRankTimers, lockRankTimer, lockRankNetpollInit, lockRankRoot, lockRankItab, lockRankReflectOffs, lockRankSynctest, lockRankUserArenaState, lockRankTraceBuf, lockRankTraceStrings, lockRankFin, lockRankSpanSetSpine, lockRankMspanSpecial, lockRankGcBitsArenas, lockRankProfInsert, lockRankProfBlock, lockRankProfMemActive, lockRankProfMemFuture, lockRankGscan, lockRankStackpool, lockRankStackLarge, lockRankWbufSpans, lockRankMheap, lockRankTrace},
|
||||
lockRankPanic: {},
|
||||
lockRankDeadlock: {lockRankPanic, lockRankDeadlock},
|
||||
lockRankRaceFini: {lockRankPanic},
|
||||
lockRankAllocmRInternal: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankAllocmW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR},
|
||||
lockRankExecRInternal: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankExecR},
|
||||
lockRankAllocmRInternal: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankAllocmW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankAllocmR},
|
||||
lockRankExecRInternal: {lockRankSysmon, lockRankScavenge, lockRankForcegc, lockRankComputeMaxProcs, lockRankUpdateMaxProcsG, lockRankSweepWaiters, lockRankAssistQueue, lockRankStrongFromWeakQueue, lockRankCleanupQueue, lockRankSweep, lockRankTestR, lockRankTimerSend, lockRankExecW, lockRankCpuprof, lockRankPollDesc, lockRankWakeableSleep, lockRankHchan, lockRankExecR},
|
||||
lockRankTestRInternal: {lockRankTestR, lockRankTestW},
|
||||
}
|
||||
|
|
|
|||
|
|
@ -41,7 +41,7 @@ const ranks = `
|
|||
# Sysmon
|
||||
NONE
|
||||
< sysmon
|
||||
< scavenge, forcegc, updateMaxProcsG;
|
||||
< scavenge, forcegc, computeMaxProcs, updateMaxProcsG;
|
||||
|
||||
# Defer
|
||||
NONE < defer;
|
||||
|
|
@ -64,6 +64,7 @@ NONE < allocmW, execW, cpuprof, pollCache, pollDesc, wakeableSleep;
|
|||
scavenge, sweep, testR, wakeableSleep, timerSend < hchan;
|
||||
assistQueue,
|
||||
cleanupQueue,
|
||||
computeMaxProcs,
|
||||
cpuprof,
|
||||
forcegc,
|
||||
updateMaxProcsG,
|
||||
|
|
|
|||
|
|
@ -835,6 +835,7 @@ func schedinit() {
|
|||
lockInit(&reflectOffs.lock, lockRankReflectOffs)
|
||||
lockInit(&finlock, lockRankFin)
|
||||
lockInit(&cpuprof.lock, lockRankCpuprof)
|
||||
lockInit(&computeMaxProcsLock, lockRankComputeMaxProcs)
|
||||
allocmLock.init(lockRankAllocmR, lockRankAllocmRInternal, lockRankAllocmW)
|
||||
execLock.init(lockRankExecR, lockRankExecRInternal, lockRankExecW)
|
||||
traceLockInit()
|
||||
|
|
@ -1727,7 +1728,6 @@ func startTheWorldWithSema(now int64, w worldStop) int64 {
|
|||
procs := gomaxprocs
|
||||
if newprocs != 0 {
|
||||
procs = newprocs
|
||||
sched.customGOMAXPROCS = newprocsCustom
|
||||
newprocs = 0
|
||||
}
|
||||
p1 := procresize(procs)
|
||||
|
|
@ -6560,7 +6560,58 @@ var (
|
|||
// GOMAXPROCS updates actually change the value of GOMAXPROCS.
|
||||
updatemaxprocs = &godebugInc{name: "updatemaxprocs"}
|
||||
|
||||
// Synchronization and state between updateMaxProcsGoroutine and
|
||||
// sysmon.
|
||||
updateMaxProcsG updateMaxProcsGState
|
||||
|
||||
// Synchronization between GOMAXPROCS and sysmon.
|
||||
//
|
||||
// Setting GOMAXPROCS via a call to GOMAXPROCS disables automatic
|
||||
// GOMAXPROCS updates.
|
||||
//
|
||||
// We want to make two guarantees to callers of GOMAXPROCS. After
|
||||
// GOMAXPROCS returns:
|
||||
//
|
||||
// 1. The runtime will not make any automatic changes to GOMAXPROCS.
|
||||
//
|
||||
// 2. The runtime will not perform any of the system calls used to
|
||||
// determine the appropriate value of GOMAXPROCS (i.e., it won't
|
||||
// call defaultGOMAXPROCS).
|
||||
//
|
||||
// (1) is the baseline guarantee that everyone needs. The GOMAXPROCS
|
||||
// API isn't useful to anyone if automatic updates may occur after it
|
||||
// returns. This is easily achieved by double-checking the state under
|
||||
// STW before committing an automatic GOMAXPROCS update.
|
||||
//
|
||||
// (2) doesn't matter to most users, as it is isn't observable as long
|
||||
// as (1) holds. However, it can be important to users sandboxing Go.
|
||||
// They want disable these system calls and need some way to know when
|
||||
// they are guaranteed the calls will stop.
|
||||
//
|
||||
// This would be simple to achieve if we simply called
|
||||
// defaultGOMAXPROCS under STW in updateMaxProcsGoroutine below.
|
||||
// However, we would like to avoid scheduling this goroutine every
|
||||
// second when it will almost never do anything. Instead, sysmon calls
|
||||
// defaultGOMAXPROCS to decide whether to schedule
|
||||
// updateMaxProcsGoroutine. Thus we need to synchronize between sysmon
|
||||
// and GOMAXPROCS calls.
|
||||
//
|
||||
// GOMAXPROCS can't hold a runtime mutex across STW. It could hold a
|
||||
// semaphore, but sysmon cannot take semaphores. Instead, we have a
|
||||
// more complex scheme:
|
||||
//
|
||||
// * sysmon holds computeMaxProcsLock while calling defaultGOMAXPROCS.
|
||||
// * sysmon skips the current update if sched.customGOMAXPROCS is
|
||||
// set.
|
||||
// * GOMAXPROCS sets sched.customGOMAXPROCS once it is committed to
|
||||
// changing GOMAXPROCS.
|
||||
// * GOMAXPROCS takes computeMaxProcsLock to wait for outstanding
|
||||
// defaultGOMAXPROCS calls to complete.
|
||||
//
|
||||
// N.B. computeMaxProcsLock could simply be sched.lock, but we want to
|
||||
// avoid holding that lock during the potentially slow
|
||||
// defaultGOMAXPROCS.
|
||||
computeMaxProcsLock mutex
|
||||
)
|
||||
|
||||
// Start GOMAXPROCS update helper goroutine.
|
||||
|
|
@ -6614,25 +6665,31 @@ func updateMaxProcsGoroutine() {
|
|||
// TODO(prattmic): this could use a nicer API. Perhaps add it to the
|
||||
// stw parameter?
|
||||
newprocs = updateMaxProcsG.procs
|
||||
newprocsCustom = false
|
||||
lock(&sched.lock)
|
||||
sched.customGOMAXPROCS = false
|
||||
unlock(&sched.lock)
|
||||
|
||||
startTheWorldGC(stw)
|
||||
}
|
||||
}
|
||||
|
||||
func sysmonUpdateGOMAXPROCS() {
|
||||
// Synchronize with GOMAXPROCS. See comment on computeMaxProcsLock.
|
||||
lock(&computeMaxProcsLock)
|
||||
|
||||
// No update if GOMAXPROCS was set manually.
|
||||
lock(&sched.lock)
|
||||
custom := sched.customGOMAXPROCS
|
||||
curr := gomaxprocs
|
||||
unlock(&sched.lock)
|
||||
if custom {
|
||||
unlock(&computeMaxProcsLock)
|
||||
return
|
||||
}
|
||||
|
||||
// Don't hold sched.lock while we read the filesystem.
|
||||
procs := defaultGOMAXPROCS(0)
|
||||
|
||||
unlock(&computeMaxProcsLock)
|
||||
if procs == curr {
|
||||
// Nothing to do.
|
||||
return
|
||||
|
|
|
|||
|
|
@ -1213,7 +1213,6 @@ var (
|
|||
forcegc forcegcstate
|
||||
sched schedt
|
||||
newprocs int32
|
||||
newprocsCustom bool // newprocs value is manually set via runtime.GOMAXPROCS.
|
||||
)
|
||||
|
||||
var (
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue