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69 lines
1.8 KiB
69 lines
1.8 KiB
#!/bin/bash |
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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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# bash specific - non posix |
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disown
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