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procfs: iowait_percent fixup

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Fix time delta calculation, and use old percentage when
querying more often than once a second.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2020-05-25 12:09:16 +02:00
parent 438262b503
commit 411e63ce29
1 changed files with 10 additions and 6 deletions
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16
proxmox/src/sys/linux/procfs.rs
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@ -243,17 +243,18 @@ pub fn read_proc_stat() -> Result<ProcFsStat, Error> {
let prev_read_guarded = PROC_LAST_STAT.read().unwrap();
let (prev_stat, prev_time, first_time) = &*prev_read_guarded;
update_duration = sample_time
.saturating_duration_since(*prev_time)
.as_millis();
.saturating_duration_since(*prev_time);
// only update if data is old
if update_duration < 1000 && !first_time {
if update_duration.as_millis() < 1000 && !first_time {
stat.cpu = prev_stat.cpu;
stat.iowait_percent = prev_stat.iowait_percent;
return Ok(stat);
}
}
{
let diff = (update_duration as f64) * *CLOCK_TICKS * (stat.cpu_count as f64);
let delta_seconds =
(update_duration.as_secs() as f64) * *CLOCK_TICKS * (stat.cpu_count as f64);
// write lock scope
let mut prev_write_guarded = PROC_LAST_STAT.write().unwrap();
@ -266,8 +267,10 @@ pub fn read_proc_stat() -> Result<ProcFsStat, Error> {
stat.cpu = 1. - (delta_idle as f64) / (delta_total as f64);
let delta_iowait = ((stat.iowait - prev_stat.iowait) as f64).min(diff);
stat.iowait_percent = delta_iowait / diff;
if !*first_time {
let delta_iowait = ((stat.iowait - prev_stat.iowait) as f64).min(delta_seconds);
stat.iowait_percent = delta_iowait / delta_seconds;
}
*prev_stat = ProcFsStat { ..stat };
*prev_time = sample_time;
@ -404,6 +407,7 @@ fn test_read_proc_stat() {
assert_eq!(stat.total, 267976855);
assert_eq!(stat.cpu, 0.012170230149167183);
assert_eq!(stat.cpu_count, 16);
assert_eq!(stat.iowait_percent, 0.0);
}
#[derive(Debug)]