ksm

#!/usr/bin/env python3

# fmt: off
#%# family=auto
#%# capabilities=autoconf
# fmt: on

import os
import sys

KSM_DIR = "/sys/kernel/mm/ksm/"
KEYS = ("shared", "sharing", "unshared", "volatile")

if "autoconf" in sys.argv:
    if os.path.exists(KSM_DIR):
        print("yes")
    else:
        print(f"no ({KSM_DIR} not found)")
elif "config" in sys.argv:
    print("graph_title Kernel shared memory")
    print("graph_category system")
    print("graph_info kernel shared memory")
    for key in KEYS:
        print(f"{key}.label {key}")
else:
    os.chdir(KSM_DIR)
    for key in KEYS:
        with open(f"pages_{key}") as handle:
            print(f"{key}.value {handle.read().strip()}")