Zswapの情報を若干見やすく表示するやつ

zswap-stat

#!/usr/bin/python3

import os

if os.getuid() != 0:
    print("error: you cannot perform this operation unless you are root.")
    exit(1)


def read(path):
    with open(path) as f:
        return f.readline().strip()


def printstat(key, val):
    print((key+":").ljust(30, " ")+val)


def prettysize(bytes):
    return str(round(int(bytes)/(1024*1024), 3))+"MiB"


printstat("enabled", read("/sys/module/zswap/parameters/enabled"))
printstat("same filled pages enabled",
          read("/sys/module/zswap/parameters/same_filled_pages_enabled"))
printstat("max pool", read("/sys/module/zswap/parameters/max_pool_percent")+"%")
printstat("compressor", read("/sys/module/zswap/parameters/compressor"))
printstat("zpool", read("/sys/module/zswap/parameters/zpool"))

print()

printstat("pool total size", prettysize(
    read("/sys/kernel/debug/zswap/pool_total_size")))
stored = int(read("/sys/kernel/debug/zswap/stored_pages"))*4096
total = int(read("/sys/kernel/debug/zswap/pool_total_size"))
if total != 0:
    printstat("compression ratio", str(round(stored/total, 4)))
else:
    printstat("compression ratio", "NaN")

print()

printstat("same filled pages", read(
    "/sys/kernel/debug/zswap/same_filled_pages"))
printstat("stored pages", read("/sys/kernel/debug/zswap/stored_pages"))
printstat("written back pages", read(
    "/sys/kernel/debug/zswap/written_back_pages"))
printstat("reject compress poor", read(
    "/sys/kernel/debug/zswap/reject_compress_poor"))
printstat("reject kmemcache fail", read(
    "/sys/kernel/debug/zswap/reject_kmemcache_fail"))
printstat("reject alloc fail", read(
    "/sys/kernel/debug/zswap/reject_alloc_fail"))
printstat("reject reclaim fail", read(
    "/sys/kernel/debug/zswap/reject_reclaim_fail"))
printstat("reject kmemcache fail", read(
    "/sys/kernel/debug/zswap/reject_kmemcache_fail"))