[置顶] Linux调试工具之：ftrace

Function Trace (ftrace) is a heavy feature that intensely uses CPU resources to produce the  results. Ftrace uses the frysk engine to trace system calls in a manner similar to strace。 1.预备编译kenrel Kernel hacking → Tracers → Kernel Function Tracer 例如高通平台的编译 # source build/envsetup.sh # choosecombo 1 1 msm8960 3 # make kernelconfig 2.设置，使用新的Kernel与Android rootfs启动后 2.1挂载调试的文件系统到sdcard # mount -t debugfs nodev /mnt/sdcard/debug 2.2 调试文件列表 # ls /mnt/sdcard/debug/tracing 2.3 打印available_tracers # cat mnt/sdcard/debug/tracing/available_tracers 2.4 使能需要监控 # echo function > /mnt/sdcard/debug/tracing/current_trace # echo 1 > /mnt/sdcard/debug/tracing/tracing_on 2.5 检查是否打开 # cat /mnt/sdcard/debug/tracing/current_tracer 2.6 查看 # cat /mnt/sdcard/debug/tracing/trace ================================= 通过PID查询进程 # echo <pid> > mnt/sdcard/debug/tracing/set_ftrace_pid 禁止 echo -1 > set_ftrace_pid