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#!/usr/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 "$(get_trace_base)/tracing/trace" ]
}
prepare_debugfs() {
trace_base=$(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 [ "$DEBUG_MEM_LEVEL" -ge 5 ]; then
echo "memstrack - will report kernel module memory usage summary and top allocation stack"
nohup memstrack --report module_summary,module_top --notui --throttle 80 -o /.memstrack > /dev/null &
elif [ "$DEBUG_MEM_LEVEL" -ge 4 ]; then
echo "memstrack - will report memory usage summary"
nohup memstrack --report module_summary --notui --throttle 80 -o /.memstrack > /dev/null &
else
exit 0
fi
fi
PID=$!
RET=$?
if [ $RET -ne 0 ]; then
echo "Failed to start memstrack, exit status: $RET"
exit $RET
fi
echo $PID > /run/memstrack.pid
# Wait a second for memstrack to setup everything, avoid missing any event
sleep 1