kvm: Add more VM stats
This changeset adds the following stats to KVM: * numVMHalfEntries: Number of entries into KVM to finalize pending IO operations without executing guest instructions. These typically happen as a result of a drain where the guest must finalize some operations before the guest state is consistent. * numExitSignal: Number of VM exits that have been triggered by a signal. These usually happen as a result of the timer that limits the time spent in KVM.
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2 changed files with 18 additions and 2 deletions
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@ -201,6 +201,16 @@ BaseKvmCPU::regStats()
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.desc("total number of KVM exits")
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;
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numVMHalfEntries
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.name(name() + ".numVMHalfEntries")
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.desc("number of KVM entries to finalize pending operations")
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;
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numExitSignal
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.name(name() + ".numExitSignal")
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.desc("exits due to signal delivery")
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;
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numMMIO
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.name(name() + ".numMMIO")
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.desc("number of VM exits due to memory mapped IO")
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@ -523,10 +533,12 @@ BaseKvmCPU::tick()
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// Enter into the RunningService state unless the
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// simulation was stopped by a timer.
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if (_kvmRun->exit_reason != KVM_EXIT_INTR)
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if (_kvmRun->exit_reason != KVM_EXIT_INTR) {
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_status = RunningService;
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else
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} else {
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++numExitSignal;
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_status = Running;
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}
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if (tryDrain())
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_status = Idle;
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@ -574,6 +586,8 @@ BaseKvmCPU::kvmRun(Tick ticks)
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// then immediately exits.
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DPRINTF(KvmRun, "KVM: Delivering IO without full guest entry\n");
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++numVMHalfEntries;
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// This signal is always masked while we are executing in gem5
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// and gets unmasked temporarily as soon as we enter into
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// KVM. See setSignalMask() and setupSignalHandler().
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@ -687,6 +687,8 @@ class BaseKvmCPU : public BaseCPU
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/* @{ */
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Stats::Scalar numInsts;
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Stats::Scalar numVMExits;
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Stats::Scalar numVMHalfEntries;
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Stats::Scalar numExitSignal;
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Stats::Scalar numMMIO;
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Stats::Scalar numCoalescedMMIO;
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Stats::Scalar numIO;
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