Ftrace查看函数向上的调用栈

1 方法一：使用function tracer

cat ./available_filter_functions | grep vfs_open
cat ./available_filter_functions | grep bio_add_page

#! /bin/bash

CURRENT_DIR=$(pwd)
SCRIPT_DIR=$(cd $(dirname ${BASH_SOURCE[0]}); pwd)
TRACE_DIR='/sys/kernel/debug/tracing/'

cd ${TRACE_DIR}
echo 0 > ./tracing_on && echo > ./trace
echo bio_add_page > ./set_ftrace_filter
echo vfs_open >> ./set_ftrace_filter
echo 1 > ./options/func_stack_trace

echo function > ./current_tracer # turn on
echo 1 > ./tracing_on
${SCRIPT_DIR}/run_test.sh && cp ./trace ${SCRIPT_DIR}/trace_test.log
echo 0 > ./tracing_on
echo nop > ./current_tracer # turn off

echo 0 > ./options/func_stack_trace
echo !bio_add_page >> ./set_ftrace_filter
echo !vfs_open >> ./set_ftrace_filter
cat ${SCRIPT_DIR}/trace_test.log

cd ${CURRENT_DIR}
exec "$@"

2 方法二：使用kprobe event

cat ./available_filter_functions | grep vfs_open
# echo 'p vfs_open' > ./kprobe_events
## cat ./kprobe_events
### p:kprobes/p_vfs_open_0 vfs_open

#! /bin/bash

CURRENT_DIR=$(pwd)
SCRIPT_DIR=$(cd $(dirname ${BASH_SOURCE[0]}); pwd)
TRACE_DIR='/sys/kernel/debug/tracing/'

cd ${TRACE_DIR}
echo nop > current_tracer
echo 0 > ./tracing_on && echo > ./trace
echo 'p vfs_open' > ./kprobe_events
echo 1 > ./options/stacktrace
# or
# echo 'stacktrace' > ./events/kprobes/p_vfs_open_0/trigger

echo 1 > ./events/kprobes/p_vfs_open_0/enable # turn on
echo 1 > ./tracing_on
${SCRIPT_DIR}/run_test.sh && cp ./trace ${SCRIPT_DIR}/trace_test.log
echo 0 > ./tracing_on
echo 0 > ./events/kprobes/p_vfs_open_0/enable # turn off

# echo '!stacktrace' >  ./events/kprobes/p_vfs_open_0/trigger
echo 0 > ./options/stacktrace
echo '-:p_vfs_open_0' >> kprobe_events
cat ${SCRIPT_DIR}/trace_test.log

cd ${CURRENT_DIR}
exec "$@"

3 方式三：一招制胜

#! /bin/bash

CURRENT_DIR=$(pwd)
SCRIPT_DIR=$(cd $(dirname ${BASH_SOURCE[0]}); pwd)
TRACE_DIR='/sys/kernel/debug/tracing/'

cd ${TRACE_DIR}
echo nop > current_tracer
echo 0 > ./tracing_on && echo > ./trace

echo 'blk_update_request:stacktrace' > ./set_ftrace_filter
echo 1 > ./tracing_on
${SCRIPT_DIR}/run_test.sh && cp ./trace ${SCRIPT_DIR}/trace_test.log
echo 0 > ./tracing_on
echo "!blk_update_request:stacktrace" > ./set_ftrace_filter

cat ${SCRIPT_DIR}/trace_test.log
cd ${CURRENT_DIR}
exec "$@"

4 参考资料

1. 谢欢, ftrace公开课

最后

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