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Fixes in accounting of guest time when using virtualization 

(thanks to Patrick Marlier)
This commit is contained in:
Hisham Muhammad 2013-12-18 02:20:39 +00:00
parent 6cfa9e0bf2
commit af285d1d3b
2 changed files with 15 additions and 10 deletions
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2
ChangeLog
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@ -1,6 +1,8 @@
What's new in version 1.0.3
* Fixes in accounting of guest time when using virtualization
(thanks to Patrick Marlier)
* Performance improvements
(thanks to Jann Horn)
* Further performance improvements due to conditional parsing

23
ProcessList.c
View File

@ -886,24 +886,27 @@ void ProcessList_scan(ProcessList* this) {
for (int i = 0; i <= cpus; i++) {
char buffer[256];
int cpuid;
unsigned long long int ioWait, irq, softIrq, steal, guest;
ioWait = irq = softIrq = steal = guest = 0;
unsigned long long int ioWait, irq, softIrq, steal, guest, guestnice;
ioWait = irq = softIrq = steal = guest = guestnice = 0;
// Dependending on your kernel version,
// 5, 7 or 8 of these fields will be set.
// 5, 7, 8 or 9 of these fields will be set.
// The rest will remain at zero.
fgets(buffer, 255, file);
if (i == 0)
sscanf(buffer, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu", &usertime, &nicetime, &systemtime, &idletime, &ioWait, &irq, &softIrq, &steal, &guest);
sscanf(buffer, "cpu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu", &usertime, &nicetime, &systemtime, &idletime, &ioWait, &irq, &softIrq, &steal, &guest, &guestnice);
else {
sscanf(buffer, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu", &cpuid, &usertime, &nicetime, &systemtime, &idletime, &ioWait, &irq, &softIrq, &steal, &guest);
sscanf(buffer, "cpu%d %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu", &cpuid, &usertime, &nicetime, &systemtime, &idletime, &ioWait, &irq, &softIrq, &steal, &guest, &guestnice);
assert(cpuid == i - 1);
}
// Guest time is already accounted in usertime
usertime = usertime - guest;
nicetime = nicetime - guestnice;
// Fields existing on kernels >= 2.6
// (and RHEL's patched kernel 2.4...)
idlealltime = idletime + ioWait;
systemalltime = systemtime + irq + softIrq;
virtalltime = steal + guest;
totaltime = usertime + nicetime + systemalltime + idlealltime + virtalltime;
virtalltime = guest + guestnice;
totaltime = usertime + nicetime + systemalltime + idlealltime + steal + virtalltime;
CPUData* cpuData = &(this->cpus[i]);
assert (usertime >= cpuData->userTime);
assert (nicetime >= cpuData->niceTime);
@ -916,7 +919,7 @@ void ProcessList_scan(ProcessList* this) {
assert (irq >= cpuData->irqTime);
assert (softIrq >= cpuData->softIrqTime);
assert (steal >= cpuData->stealTime);
assert (guest >= cpuData->guestTime);
assert (virtalltime >= cpuData->guestTime);
cpuData->userPeriod = usertime - cpuData->userTime;
cpuData->nicePeriod = nicetime - cpuData->niceTime;
cpuData->systemPeriod = systemtime - cpuData->systemTime;
@ -927,7 +930,7 @@ void ProcessList_scan(ProcessList* this) {
cpuData->irqPeriod = irq - cpuData->irqTime;
cpuData->softIrqPeriod = softIrq - cpuData->softIrqTime;
cpuData->stealPeriod = steal - cpuData->stealTime;
cpuData->guestPeriod = guest - cpuData->guestTime;
cpuData->guestPeriod = virtalltime - cpuData->guestTime;
cpuData->totalPeriod = totaltime - cpuData->totalTime;
cpuData->userTime = usertime;
cpuData->niceTime = nicetime;
@ -939,7 +942,7 @@ void ProcessList_scan(ProcessList* this) {
cpuData->irqTime = irq;
cpuData->softIrqTime = softIrq;
cpuData->stealTime = steal;
cpuData->guestTime = guest;
cpuData->guestTime = virtalltime;
cpuData->totalTime = totaltime;
}
double period = (double)this->cpus[0].totalPeriod / cpus; fclose(file);