changeset 9df73385c878 in /z/repo/gem5
details: http://repo.gem5.org/gem5?cmd=changeset;node=9df73385c878
description:
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.
diffstat:
src/cpu/kvm/base.cc | 18 ++++++++++++++++--
src/cpu/kvm/base.hh | 2 ++
2 files changed, 18 insertions(+), 2 deletions(-)
diffs (56 lines):
diff -r 91fbf7b7e933 -r 9df73385c878 src/cpu/kvm/base.cc
--- a/src/cpu/kvm/base.cc Tue Jun 11 09:24:55 2013 +0200
+++ b/src/cpu/kvm/base.cc Tue Jun 11 09:43:05 2013 +0200
@@ -201,6 +201,16 @@
.desc("total number of KVM exits")
;
+ numVMHalfEntries
+ .name(name() + ".numVMHalfEntries")
+ .desc("number of KVM entries to finalize pending operations")
+ ;
+
+ numExitSignal
+ .name(name() + ".numExitSignal")
+ .desc("exits due to signal delivery")
+ ;
+
numMMIO
.name(name() + ".numMMIO")
.desc("number of VM exits due to memory mapped IO")
@@ -523,10 +533,12 @@
// Enter into the RunningService state unless the
// simulation was stopped by a timer.
- if (_kvmRun->exit_reason != KVM_EXIT_INTR)
+ if (_kvmRun->exit_reason != KVM_EXIT_INTR) {
_status = RunningService;
- else
+ } else {
+ ++numExitSignal;
_status = Running;
+ }
if (tryDrain())
_status = Idle;
@@ -574,6 +586,8 @@
// then immediately exits.
DPRINTF(KvmRun, "KVM: Delivering IO without full guest entry\n");
+ ++numVMHalfEntries;
+
// This signal is always masked while we are executing in gem5
// and gets unmasked temporarily as soon as we enter into
// KVM. See setSignalMask() and setupSignalHandler().
diff -r 91fbf7b7e933 -r 9df73385c878 src/cpu/kvm/base.hh
--- a/src/cpu/kvm/base.hh Tue Jun 11 09:24:55 2013 +0200
+++ b/src/cpu/kvm/base.hh Tue Jun 11 09:43:05 2013 +0200
@@ -687,6 +687,8 @@
/* @{ */
Stats::Scalar numInsts;
Stats::Scalar numVMExits;
+ Stats::Scalar numVMHalfEntries;
+ Stats::Scalar numExitSignal;
Stats::Scalar numMMIO;
Stats::Scalar numCoalescedMMIO;
Stats::Scalar numIO;
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