int64
PageFaultsDataSource::NextValue(SystemInfo& info)
{
uint64 faults = info.PageFaults();
int64 faultsPerSecond = uint64(1024 * double(faults - fPreviousFaults)
/ (info.Time() - fPreviousTime) * 1000000.0);
fPreviousFaults = faults;
fPreviousTime = info.Time();
return faultsPerSecond;
}
int64
NetworkUsageDataSource::NextValue(SystemInfo& info)
{
uint64 transferred = fIn ? info.NetworkReceived() : info.NetworkSent();
int64 bytesPerSecond = uint64(double(transferred - fPreviousBytes)
/ (info.Time() - fPreviousTime) * 1000000.0);
fPreviousBytes = transferred;
fPreviousTime = info.Time();
return bytesPerSecond;
}
int64
CPUUsageDataSource::NextValue(SystemInfo& info)
{
bigtime_t active = info.Info().cpu_infos[fCPU].active_time;
int64 percent = int64(1000.0 * (active - fPreviousActive)
/ (info.Time() - fPreviousTime));
if (percent < 0)
percent = 0;
if (percent > 1000)
percent = 1000;
fPreviousActive = active;
fPreviousTime = info.Time();
return percent;
}
int64
CPUCombinedUsageDataSource::NextValue(SystemInfo& info)
{
int32 running = 0;
bigtime_t active = 0;
for (int32 cpu = 0; cpu < info.Info().cpu_count; cpu++) {
active += info.Info().cpu_infos[cpu].active_time;
running++;
// TODO: take disabled CPUs into account
}
int64 percent = int64(1000.0 * (active - fPreviousActive)
/ (running * (info.Time() - fPreviousTime)));
if (percent < 0)
percent = 0;
if (percent > 1000)
percent = 1000;
fPreviousActive = active;
fPreviousTime = info.Time();
return percent;
}