Documentation/accounting/psi.rst

4 PSI - Pressure Stall Information
14 either play it safe and under-utilize their hardware resources, or
23 scarcity aids users in sizing workloads to hardware--or provisioning
38 respective file in /proc/pressure/ -- cpu, memory, and io.
43 	full avg10=0.00 avg60=0.00 avg300=0.00 total=0
48 The "full" line indicates the share of time in which all non-idle
55 stall state is tracked separately and exported in the "full" averages.
57 CPU full is undefined at the system level, but has been reported
65 or to average trends over custom time frames.
83 	<some|full> <stall amount in us> <time window in us>
87 1sec time window. Writing "full 50000 1000000" into /proc/pressure/io
88 would add 50ms threshold for full io stall measured within 1sec time window.
116 Notifications to the userspace are rate-limited to one per tracking window.
118 The trigger will de-register when the file descriptor used to define the
158 		n = poll(&fds, 1, -1);
187 Per-cgroup psi monitors can be specified and used the same way as
188 system-wide ones.