#!/bin/bash

# 获取总 Swap（单位 kB）
total_swap_kb=$(grep SwapTotal /proc/meminfo | awk '{print $2}')

if [ "$total_swap_kb" -eq 0 ]; then
    echo "系统未启用 Swap"
    exit 1
fi

printf "%-8s %-12s %-25s %-12s %-8s\n" "PID" "USER" "PROCESS" "SWAP(MB)" "USAGE%"

for pid in $(ls /proc | grep -E '^[0-9]+$'); do
    if [ -r /proc/$pid/status ]; then
        swap_kb=$(grep VmSwap /proc/$pid/status 2>/dev/null | awk '{print $2}')
        if [ ! -z "$swap_kb" ] && [ "$swap_kb" -gt 0 ]; then
            user=$(ps -o user= -p $pid 2>/dev/null)
            comm=$(ps -o comm= -p $pid 2>/dev/null)

            swap_mb=$(awk "BEGIN {printf \"%.2f\", $swap_kb/1024}")
            percent=$(awk "BEGIN {printf \"%.2f\", ($swap_kb/$total_swap_kb)*100}")

            printf "%-8s %-12s %-25s %-12s %-8s\n" \
                "$pid" "$user" "$comm" "$swap_mb" "$percent"
        fi
    fi
done | sort -k4 -nr