systemtab kernel detection and debugging tools available under Linux, you can customize the function you want to test, debug print output.
Compile and run
Compiled executable modules:
STAP systemtab_script -m Module
systemtab_script: systemtab write their own script
module: ko generated kernel module name
After compilation, the script will be written compiled into the kernel Ko
Execute the generated kernel Ko:
staprun module.ko
grammar
#！/usr/bin/env stap
probe timer.ms(3000){
printf("Hello!\n");
}
Above implements an output once every 3s hello script
probe statement indicates that this is a detection point, will perform the appropriate treatment after detecting condition is satisfied.
Commonly used detection point:
the Timer: timer, time will meet the trigger. As the example above is triggered once every 3s
kernel.function ( "FUNCTION"): Specifies the function detects the specified function triggers. If you specify kernel.function ( "sys_ *") is detected by the system call function executes
