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Diffstat (limited to 'Documentation/accounting/psi.rst')
| -rw-r--r-- | Documentation/accounting/psi.rst | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/accounting/psi.rst b/Documentation/accounting/psi.rst index 5e40b3f437f9..d455db3e5808 100644 --- a/Documentation/accounting/psi.rst +++ b/Documentation/accounting/psi.rst @@ -105,6 +105,10 @@ prevent overly frequent polling. Max limit is chosen as a high enough number after which monitors are most likely not needed and psi averages can be used instead. +Unprivileged users can also create monitors, with the only limitation that the +window size must be a multiple of 2s, in order to prevent excessive resource +usage. + When activated, psi monitor stays active for at least the duration of one tracking window to avoid repeated activations/deactivations when system is bouncing in and out of the stall state. @@ -174,7 +178,7 @@ Userspace monitor usage example Cgroup2 interface ================= -In a system with a CONFIG_CGROUP=y kernel and the cgroup2 filesystem +In a system with a CONFIG_CGROUPS=y kernel and the cgroup2 filesystem mounted, pressure stall information is also tracked for tasks grouped into cgroups. Each subdirectory in the cgroupfs mountpoint contains cpu.pressure, memory.pressure, and io.pressure files; the format is |