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[Bug 1298573] [NEW] incorrect number of events when very short time period

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Public bug reported:

version = 1
cpus=4
clusterA:
	core0
		cpu0
		cpu1
	core1
		cpu2
		cpu3
          <idle>-0     [001] .N.. 712413.267202: cpu_idle: state=4294967295 cpu_id=1
          <idle>-0     [000] d... 712413.267204: softirq_raise: vec=9 [action=RCU]
     ksoftirqd/0-3     [000] ..s. 712413.267211: softirq_entry: vec=9 [action=RCU]
     ksoftirqd/0-3     [000] ..s. 712413.267212: softirq_exit: vec=9 [action=RCU]
          <idle>-0     [000] d... 712413.267217: softirq_raise: vec=9 [action=RCU]
     ksoftirqd/0-3     [000] ..s. 712413.267222: softirq_entry: vec=9 [action=RCU]
     ksoftirqd/0-3     [000] ..s. 712413.267223: softirq_exit: vec=9 [action=RCU]
          <idle>-0     [002] .N.. 712413.267224: cpu_idle: state=4294967295 cpu_id=2
          <idle>-0     [000] d... 712413.267227: softirq_raise: vec=9 [action=RCU]
          <idle>-0     [001] d... 712413.267227: cpu_idle: state=1 cpu_id=1
     ksoftirqd/0-3     [000] ..s. 712413.267232: softirq_entry: vec=9 [action=RCU]
     ksoftirqd/0-3     [000] ..s. 712413.267233: softirq_exit: vec=9 [action=RCU]
          <idle>-0     [000] d... 712413.267236: cpu_idle: state=1 cpu_id=0
          <idle>-0     [003] .N.. 712413.267240: cpu_idle: state=4294967295 cpu_id=3
          <idle>-0     [002] d... 712413.267243: cpu_idle: state=4 cpu_id=2
          <idle>-0     [000] .N.. 712413.267291: cpu_idle: state=4294967295 cpu_id=0
          <idle>-0     [003] d... 712413.267293: softirq_raise: vec=9 [action=RCU]
     ksoftirqd/3-18    [003] ..s. 712413.267307: softirq_entry: vec=9 [action=RCU]
     ksoftirqd/3-18    [003] ..s. 712413.267308: softirq_exit: vec=9 [action=RCU]
          <idle>-0     [001] .N.. 712413.267308: cpu_idle: state=4294967295 cpu_id=1
          <idle>-0     [000] d... 712413.267309: cpu_idle: state=1 cpu_id=0
          <idle>-0     [003] d... 712413.267309: softirq_raise: vec=9 [action=RCU]
     ksoftirqd/3-18    [003] ..s. 712413.267310: softirq_entry: vec=9 [action=RCU]
     ksoftirqd/3-18    [003] ..s. 712413.267311: softirq_exit: vec=9 [action=RCU]
          <idle>-0     [003] d... 712413.267312: softirq_raise: vec=9 [action=RCU]
          <idle>-0     [002] .N.. 712413.267312: cpu_idle: state=4294967295 cpu_id=2
          <idle>-0     [001] d... 712413.267312: cpu_idle: state=1 cpu_id=1
     ksoftirqd/3-18    [003] ..s. 712413.267313: softirq_entry: vec=9 [action=RCU]
     ksoftirqd/3-18    [003] ..s. 712413.267314: softirq_exit: vec=9 [action=RCU]
          <idle>-0     [003] d... 712413.267315: cpu_idle: state=1 cpu_id=3

Log is 0.000243 secs long with 158584852 events
Total trace buffer: 30784 kB

** Affects: linaro-power-idlestat
     Importance: High
     Assignee: Zoran Markovic (zoran-markovic-a)
         Status: New

** Changed in: linaro-power-idlestat
   Importance: Undecided => High

** Changed in: linaro-power-idlestat
     Assignee: (unassigned) => Zoran Markovic (zoran-markovic-a)

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https://bugs.launchpad.net/bugs/1298573

Title:
  incorrect number of events when very short time period

Status in Idlestat - optimise CPU idling:
  New

Bug description:
  version = 1
  cpus=4
  clusterA:
  	core0
  		cpu0
  		cpu1
  	core1
  		cpu2
  		cpu3
            <idle>-0     [001] .N.. 712413.267202: cpu_idle: state=4294967295 cpu_id=1
            <idle>-0     [000] d... 712413.267204: softirq_raise: vec=9 [action=RCU]
       ksoftirqd/0-3     [000] ..s. 712413.267211: softirq_entry: vec=9 [action=RCU]
       ksoftirqd/0-3     [000] ..s. 712413.267212: softirq_exit: vec=9 [action=RCU]
            <idle>-0     [000] d... 712413.267217: softirq_raise: vec=9 [action=RCU]
       ksoftirqd/0-3     [000] ..s. 712413.267222: softirq_entry: vec=9 [action=RCU]
       ksoftirqd/0-3     [000] ..s. 712413.267223: softirq_exit: vec=9 [action=RCU]
            <idle>-0     [002] .N.. 712413.267224: cpu_idle: state=4294967295 cpu_id=2
            <idle>-0     [000] d... 712413.267227: softirq_raise: vec=9 [action=RCU]
            <idle>-0     [001] d... 712413.267227: cpu_idle: state=1 cpu_id=1
       ksoftirqd/0-3     [000] ..s. 712413.267232: softirq_entry: vec=9 [action=RCU]
       ksoftirqd/0-3     [000] ..s. 712413.267233: softirq_exit: vec=9 [action=RCU]
            <idle>-0     [000] d... 712413.267236: cpu_idle: state=1 cpu_id=0
            <idle>-0     [003] .N.. 712413.267240: cpu_idle: state=4294967295 cpu_id=3
            <idle>-0     [002] d... 712413.267243: cpu_idle: state=4 cpu_id=2
            <idle>-0     [000] .N.. 712413.267291: cpu_idle: state=4294967295 cpu_id=0
            <idle>-0     [003] d... 712413.267293: softirq_raise: vec=9 [action=RCU]
       ksoftirqd/3-18    [003] ..s. 712413.267307: softirq_entry: vec=9 [action=RCU]
       ksoftirqd/3-18    [003] ..s. 712413.267308: softirq_exit: vec=9 [action=RCU]
            <idle>-0     [001] .N.. 712413.267308: cpu_idle: state=4294967295 cpu_id=1
            <idle>-0     [000] d... 712413.267309: cpu_idle: state=1 cpu_id=0
            <idle>-0     [003] d... 712413.267309: softirq_raise: vec=9 [action=RCU]
       ksoftirqd/3-18    [003] ..s. 712413.267310: softirq_entry: vec=9 [action=RCU]
       ksoftirqd/3-18    [003] ..s. 712413.267311: softirq_exit: vec=9 [action=RCU]
            <idle>-0     [003] d... 712413.267312: softirq_raise: vec=9 [action=RCU]
            <idle>-0     [002] .N.. 712413.267312: cpu_idle: state=4294967295 cpu_id=2
            <idle>-0     [001] d... 712413.267312: cpu_idle: state=1 cpu_id=1
       ksoftirqd/3-18    [003] ..s. 712413.267313: softirq_entry: vec=9 [action=RCU]
       ksoftirqd/3-18    [003] ..s. 712413.267314: softirq_exit: vec=9 [action=RCU]
            <idle>-0     [003] d... 712413.267315: cpu_idle: state=1 cpu_id=3

  Log is 0.000243 secs long with 158584852 events
  Total trace buffer: 30784 kB

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