4.14-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Raspl stefan.raspl@de.ibm.com
[ Upstream commit 617c66b9f236d20f11cecbb3f45e6d5675b2fae1 ]
When filtering by guest, kvm_stat displays garbage when the guest is destroyed - see sample output below. We add code to remove the invalid paths from the providers, so at least no more garbage is displayed. Here's a sample output to illustrate:
kvm statistics - pid 13986 (foo)
Event Total %Total CurAvg/s diagnose_258 -2 0.0 0 deliver_program_interruption -3 0.0 0 diagnose_308 -4 0.0 0 halt_poll_invalid -91 0.0 -6 deliver_service_signal -244 0.0 -16 halt_successful_poll -250 0.1 -17 exit_pei -285 0.1 -19 exit_external_request -312 0.1 -21 diagnose_9c -328 0.1 -22 userspace_handled -713 0.1 -47 halt_attempted_poll -939 0.2 -62 deliver_emergency_signal -3126 0.6 -208 halt_wakeup -7199 1.5 -481 exit_wait_state -7379 1.5 -493 diagnose_500 -56499 11.5 -3757 exit_null -85491 17.4 -5685 diagnose_44 -133300 27.1 -8874 exit_instruction -195898 39.8 -13037 Total -492063
Signed-off-by: Stefan Raspl raspl@linux.vnet.ibm.com Signed-off-by: Radim Krčmář rkrcmar@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/kvm/kvm_stat/kvm_stat | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/tools/kvm/kvm_stat/kvm_stat +++ b/tools/kvm/kvm_stat/kvm_stat @@ -731,6 +731,13 @@ class DebugfsProvider(Provider): self.do_read = True self.reset()
+ def _verify_paths(self): + """Remove invalid paths""" + for path in self.paths: + if not os.path.exists(os.path.join(PATH_DEBUGFS_KVM, path)): + self.paths.remove(path) + continue + def read(self, reset=0, by_guest=0): """Returns a dict with format:'file name / field -> current value'.
@@ -745,6 +752,7 @@ class DebugfsProvider(Provider): # If no debugfs filtering support is available, then don't read. if not self.do_read: return results + self._verify_paths()
paths = self.paths if self._pid == 0: