psi_exporter

Prometheus exporter for Pressure Stall Information (PSI) from Linux kernel.

Requirements

Kernel must support PSI (CONFIG_PSI=y), which requires at least Linux 4.20.

Exported metric

The following metrics are exported:

$ curl -s http://ip6-localhost:12345/ | grep -E '(journald|^#)'
# HELP pressure_avg_10s_ratio Ratio of time spent under pressure in the last 10s at time of measurement
# TYPE pressure_avg_10s_ratio gauge
pressure_avg_10s_ratio{controller="cpu",id="/system.slice/systemd-journald.service",kind="some"} 0
pressure_avg_10s_ratio{controller="io",id="/system.slice/systemd-journald.service",kind="full"} 0
pressure_avg_10s_ratio{controller="io",id="/system.slice/systemd-journald.service",kind="some"} 0
pressure_avg_10s_ratio{controller="memory",id="/system.slice/systemd-journald.service",kind="full"} 0
pressure_avg_10s_ratio{controller="memory",id="/system.slice/systemd-journald.service",kind="some"} 0
# HELP pressure_avg_300s_ratio Ratio of time spent under pressure in the last 300s at time of measurement
# TYPE pressure_avg_300s_ratio gauge
pressure_avg_300s_ratio{controller="cpu",id="/system.slice/systemd-journald.service",kind="some"} 0
pressure_avg_300s_ratio{controller="io",id="/system.slice/systemd-journald.service",kind="full"} 0
pressure_avg_300s_ratio{controller="io",id="/system.slice/systemd-journald.service",kind="some"} 0
pressure_avg_300s_ratio{controller="memory",id="/system.slice/systemd-journald.service",kind="full"} 0
pressure_avg_300s_ratio{controller="memory",id="/system.slice/systemd-journald.service",kind="some"} 0
# HELP pressure_avg_60s_ratio Ratio of time spent under pressure in the last 60s at time of measurement
# TYPE pressure_avg_60s_ratio gauge
pressure_avg_60s_ratio{controller="cpu",id="/system.slice/systemd-journald.service",kind="some"} 0
pressure_avg_60s_ratio{controller="io",id="/system.slice/systemd-journald.service",kind="full"} 0
pressure_avg_60s_ratio{controller="io",id="/system.slice/systemd-journald.service",kind="some"} 0
pressure_avg_60s_ratio{controller="memory",id="/system.slice/systemd-journald.service",kind="full"} 0
pressure_avg_60s_ratio{controller="memory",id="/system.slice/systemd-journald.service",kind="some"} 0
# HELP pressure_total_seconds Total time spent under pressure
# TYPE pressure_total_seconds counter
pressure_total_seconds{controller="cpu",id="/system.slice/systemd-journald.service",kind="some"} 0.001546
pressure_total_seconds{controller="io",id="/system.slice/systemd-journald.service",kind="full"} 1.367656
pressure_total_seconds{controller="io",id="/system.slice/systemd-journald.service",kind="some"} 1.371462
pressure_total_seconds{controller="memory",id="/system.slice/systemd-journald.service",kind="full"} 0
pressure_total_seconds{controller="memory",id="/system.slice/systemd-journald.service",kind="some"} 0

Usage

• --metrics.disable-avg disables reporting of averages.
• --metrics.silence-zeros silences reporting of zero values.

License

MIT