Current File : //usr/share/systemtap/examples/profiling/ioctl_handler.stp
#!/usr/bin/stap
# Copyright (C) 2018 Red Hat, Inc.
# Written by William Cohen <wcohen@redhat.com>
#
global ioctl_requests, ioctl_func
probe syscall.ioctl {
ioctl_requests[execname()] <<< 1
try {
# Dig down through the task struct to find the actual function handling ioctl.
ioctl_func_address = @cast(task_current(), "struct task_struct")->files->fdt->fd[fd]->f_op->unlocked_ioctl
if (ioctl_func_address)
ioctl_func[execname(), ioctl_func_address] <<< 1
} catch {
ioctl_func[execname(), 0] <<< 1
}
}
probe end {
printf("Per execname ioctl information\n")
foreach ([e+, f] in ioctl_func) {
if (current_exec != e){
printf("%s %d\n", e, @sum(ioctl_requests[e]))
current_exec = e
}
printf(" %s %d\n", symdata(f), @sum(ioctl_func[e,f]))
}
}
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