Show I/O PSI of cgroups

psi-io-cg.sh

#!/bin/bash

CGROUP_PATH="/sys/fs/cgroup"

# Function to show IO PSI if avg10 is not 0 for a given cgroup
show_io_psi_if_needed() {
    local cgroup_path=$1
    local psi_file="${cgroup_path}/io.pressure"

    if [ -f "${psi_file}" ]; then
        # Check if avg10 is not 0
        if grep -qv "avg10=0." "${psi_file}"; then
            echo "PSI for IO in ${cgroup_path}:"
            cat "${psi_file}"
        fi
    fi
}

# Function to recursively check and show IO PSI if avg10 is not 0
check_and_show_io_recursive() {
    local base_path=$1
    for cgroup in $(find "$base_path" -type d); do
        show_io_psi_if_needed "${cgroup}"
    done
}

# Main
if [ -d "${CGROUP_PATH}" ]; then
    echo "Checking IO PSI for cgroups under ${CGROUP_PATH} where avg10 is not 0.00"
    check_and_show_io_recursive "${CGROUP_PATH}"
else
    echo "Cgroup v2 hierarchy not found at ${CGROUP_PATH}"
fi