#!/bin/bash

set -e

RESCTRL_MOUNT="/sys/fs/resctrl"

if [ "$(id -u)" -ne 0 ]; then
    echo "error: this script must be run as root"
    exit 1
fi

if ! grep -q "resctrl" /proc/filesystems 2>/dev/null; then
    echo "error: resctrl filesystem not supported by this kernel"
    echo "ensure config_x86_cpu_resctrl is enabled"
    exit 1
fi

if mount | grep -q "resctrl"; then
    echo "resctrl already mounted at:"
    mount | grep resctrl
    exit 0
fi

mkdir -p "$RESCTRL_MOUNT"

echo "mounting resctrl filesystem..."
mount -t resctrl resctrl "$RESCTRL_MOUNT"

echo "resctrl mounted successfully at $RESCTRL_MOUNT"
echo
echo "l3 cat info:"
if [ -d "$RESCTRL_MOUNT/info/L3" ]; then
    echo "  cbm mask:    $(cat $RESCTRL_MOUNT/info/L3/cbm_mask)"
    echo "  min cbm:     $(cat $RESCTRL_MOUNT/info/L3/min_cbm_bits)"
    echo "  num clos:    $(cat $RESCTRL_MOUNT/info/L3/num_closids)"
else
    echo "  l3 cat info not available"
fi