#!/bin/sh

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# Mount kernel debug fs so debug tools can work.

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# memdebug=4 and memdebug=5 requires debug fs to be mounted.

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# And there is no need to umount it.

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

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# "sys/kernel/tracing" has the priority if exists.

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get_trace_base() {

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# trace access through debugfs would be obsolete if "/sys/kernel/tracing" is available.

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if [ -d "/sys/kernel/tracing" ]; then

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echo "/sys/kernel"

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else

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echo "/sys/kernel/debug"

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fi

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}

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is_debugfs_ready() {

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

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}

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prepare_debugfs() {

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local trace_base

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trace_base=$(get_trace_base)

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# old debugfs interface case.

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if ! [ -d "$trace_base/tracing" ]; then

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mount none -t debugfs $trace_base

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# new tracefs interface case.

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elif ! [ -f "$trace_base/tracing/trace" ]; then

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mount none -t tracefs "$trace_base/tracing"

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fi

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if ! [ -f "$trace_base/tracing/trace" ]; then

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echo "WARN: failed to mount debugfs"

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return 1

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fi

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}

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if ! is_debugfs_ready ; then

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prepare_debugfs

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fi

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if [ -n "$DEBUG_MEM_LEVEL" ]; then

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if [ "$DEBUG_MEM_LEVEL" -ge 5 ]; then

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echo "memstrack - will report kernel module memory usage summary and top allocation stack"

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memstrack --report module_summary,module_top --notui --throttle 80 -o /.memstrack &

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elif [ "$DEBUG_MEM_LEVEL" -ge 4 ]; then

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echo "memstrack - will report memory usage summary"

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memstrack --report module_summary --notui --throttle 80 -o /.memstrack &

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else

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exit 0;

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fi

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fi

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PID=$!

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RET=$?

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if [ $RET -ne 0 ]; then

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echo "Failed to start memstrack, exit status: $RET"

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exit $RET

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fi

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

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sleep 1

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echo $PID > /run/memstrack.pid

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disown

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