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any of these values may wrap

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Hisham 2016-02-29 21:57:03 -03:00
parent 797bcd0961
commit e77811e99b
1 changed files with 14 additions and 22 deletions
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36
linux/LinuxProcessList.c
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@ -721,31 +721,23 @@ static inline double LinuxProcessList_scanCPUTime(LinuxProcessList* this) {
unsigned long long int virtalltime = guest + guestnice;
unsigned long long int totaltime = usertime + nicetime + systemalltime + idlealltime + steal + virtalltime;
CPUData* cpuData = &(this->cpus[i]);
assert (systemtime >= cpuData->systemTime);
assert (idletime >= cpuData->idleTime);
assert (totaltime >= cpuData->totalTime);
assert (systemalltime >= cpuData->systemAllTime);
assert (idlealltime >= cpuData->idleAllTime);
assert (ioWait >= cpuData->ioWaitTime);
assert (irq >= cpuData->irqTime);
assert (softIrq >= cpuData->softIrqTime);
assert (steal >= cpuData->stealTime);
assert (virtalltime >= cpuData->guestTime);
// Since we do a subtraction (usertime - guest) and cputime64_to_clock_t()
// used in /proc/stat rounds down numbers, it can lead to a case where the
// integer overflow.
cpuData->userPeriod = (usertime > cpuData->userTime) ? usertime - cpuData->userTime : 0;
cpuData->nicePeriod = (nicetime > cpuData->niceTime) ? nicetime - cpuData->niceTime : 0;
cpuData->systemPeriod = systemtime - cpuData->systemTime;
cpuData->systemAllPeriod = systemalltime - cpuData->systemAllTime;
cpuData->idleAllPeriod = idlealltime - cpuData->idleAllTime;
cpuData->idlePeriod = idletime - cpuData->idleTime;
cpuData->ioWaitPeriod = ioWait - cpuData->ioWaitTime;
cpuData->irqPeriod = irq - cpuData->irqTime;
cpuData->softIrqPeriod = softIrq - cpuData->softIrqTime;
cpuData->stealPeriod = steal - cpuData->stealTime;
cpuData->guestPeriod = virtalltime - cpuData->guestTime;
cpuData->totalPeriod = totaltime - cpuData->totalTime;
#define WRAP_SUBTRACT(a,b) (a > b) ? a - b : 0
cpuData->userPeriod = WRAP_SUBTRACT(usertime, cpuData->userTime);
cpuData->nicePeriod = WRAP_SUBTRACT(nicetime, cpuData->niceTime);
cpuData->systemPeriod = WRAP_SUBTRACT(systemtime, cpuData->systemTime);
cpuData->systemAllPeriod = WRAP_SUBTRACT(systemalltime, cpuData->systemAllTime);
cpuData->idleAllPeriod = WRAP_SUBTRACT(idlealltime, cpuData->idleAllTime);
cpuData->idlePeriod = WRAP_SUBTRACT(idletime, cpuData->idleTime);
cpuData->ioWaitPeriod = WRAP_SUBTRACT(ioWait, cpuData->ioWaitTime);
cpuData->irqPeriod = WRAP_SUBTRACT(irq, cpuData->irqTime);
cpuData->softIrqPeriod = WRAP_SUBTRACT(softIrq, cpuData->softIrqTime);
cpuData->stealPeriod = WRAP_SUBTRACT(steal, cpuData->stealTime);
cpuData->guestPeriod = WRAP_SUBTRACT(virtalltime, cpuData->guestTime);
cpuData->totalPeriod = WRAP_SUBTRACT(totaltime, cpuData->totalTime);
#undef WRAP_SUBTRACT
cpuData->userTime = usertime;
cpuData->niceTime = nicetime;
cpuData->systemTime = systemtime;