fix the blank-output of kvm_stat

Commit Message

Wu, Liming May 17, 2018, 5:54 a.m. UTC

Hi:

Sometimes the output of kvm_stat is blank and not friendly enough. 
This patch is used to fix this problem

Before:
kvm statistics - summary
 Event                                         Total %Total CurAvg/s
 ...
 kvm_apic_ipi                                      1    0.2        5
 kvm_emulate_insn                                 27    4.8
 kvm_ioapic_set_irq                                9    1.6
 kvm_pic_set_irq                                   9    1.6
 kvm_set_irq                                       9    1.6
Total                                         30216            1986

After
kvm statistics - summary
 Event                                         Total %Total CurAvg/s
 ...
 kvm_apic_ipi                                      1    0.2        5
 kvm_emulate_insn                                 27    4.8        0
 kvm_ioapic_set_irq                                9    1.6        0
 kvm_pic_set_irq                                   9    1.6        0
 kvm_set_irq                                       9    1.6        0
Total                                         30216            1986

Patch:

Patch

--- a/tools/kvm/kvm_stat/kvm_stat
+++ b/tools/kvm/kvm_stat/kvm_stat
@@ -1191,7 +1191,7 @@  class Tui(object):
                 key = self.get_gname_from_pid(key)
                 if not key:
                     continue
-            cur = int(round(values.delta / sleeptime)) if values.delta else ''
+            cur = int(round(values.delta / sleeptime)) if values.delta else 0
             if key[0] != ' ':
                 if values.delta:
                     tcur += values.delta
@@ -1206,7 +1206,7 @@  class Tui(object):
         if row == 3:
             self.screen.addstr(4, 1, 'No matching events reported yet')
         if row > 4:
-            tavg = int(round(tcur / sleeptime)) if tcur > 0 else ''
+            tavg = int(round(tcur / sleeptime)) if tcur > 0 else 0
             self.screen.addstr(row, 1, '%-40s %10d        %8s' %
                                ('Total', total, tavg), curses.A_BOLD)
         self.screen.refresh()