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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Directory : /lib/dracut/modules.d/99memstrack/

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Current File : //lib/dracut/modules.d/99memstrack/memstrack-start.sh

#!/bin/sh
# Mount kernel debug fs so debug tools can work.
# memdebug=4 and memdebug=5 requires debug fs to be mounted.
# And there is no need to umount it.

type getargnum >/dev/null 2>&1 || . /lib/dracut-lib.sh

# "sys/kernel/tracing" has the priority if exists.
get_trace_base() {
    # trace access through debugfs would be obsolete if "/sys/kernel/tracing" is available.
    if [ -d "/sys/kernel/tracing" ]; then
        echo "/sys/kernel"
    else
        echo "/sys/kernel/debug"
    fi
}

is_debugfs_ready() {
    [ -f "$(get_trace_base)/tracing/trace" ]
}

prepare_debugfs() {
    local trace_base

    trace_base=$(get_trace_base)
    # old debugfs interface case.
    if ! [ -d "$trace_base/tracing" ]; then
        mount none -t debugfs $trace_base
    # new tracefs interface case.
    elif ! [ -f "$trace_base/tracing/trace" ]; then
        mount none -t tracefs "$trace_base/tracing"
    fi

    if ! [ -f "$trace_base/tracing/trace" ]; then
        echo "WARN: failed to mount debugfs"
        return 1
    fi
}

if ! is_debugfs_ready ; then
    prepare_debugfs
fi

if [ -n "$DEBUG_MEM_LEVEL" ]; then
    if [ "$DEBUG_MEM_LEVEL" -ge 5 ]; then
        echo "memstrack - will report kernel module memory usage summary and top allocation stack"
        memstrack --report module_summary,module_top --notui --throttle 80 -o /.memstrack &
    elif [ "$DEBUG_MEM_LEVEL" -ge 4 ]; then
        echo "memstrack - will report memory usage summary"
        memstrack --report module_summary --notui --throttle 80 -o /.memstrack &
    else
        exit 0;
    fi
fi

PID=$!
RET=$?

if [ $RET -ne 0 ]; then
    echo "Failed to start memstrack, exit status: $RET"
    exit $RET
fi

# Wait a second for memstrack to setup everything, avoid missing any event
sleep 1

echo $PID > /run/memstrack.pid
disown

haha - 2025