trace_vfs_write.stp

#!/usr/bin/env stap


probe begin {
	printf("vfs_write trace starts\n")
}

global trace

probe kernel.function("vfs_write").call {
	trace[execname(), tid()] = 1
}

probe kernel.function("vfs_write").return {
	delete trace[execname(), tid()]
}

function trace(t_name, entry_p, extra) {
	if ([t_name, tid()] in trace) {
		indent = thread_indent(entry_p)

		if (entry_p > 0)
			printf("%s%s%s %s\n", indent, "-> ", ppfunc(), extra)
	}

}

probe kernel.function("*@block/*.c").call {
	trace("dd", 3, $$parms)
}

probe kernel.function("*@block/*.c").return {
	trace("dd", -3, $$return)
}

probe kernel.function("*@fs/read_write.c").call {
	trace("dd", 3, $$parms)
}

probe kernel.function("*@fs/read_write.c").return {
	trace("dd", -3, $$return)
}

probe kernel.function("*@fs/block_dev.c").call {
	trace("dd", 3, $$parms)
}

probe kernel.function("*@fs/block_dev.c").return {
	trace("dd", -3, $$return)
}

probe kernel.function("*@mm/filemap.c").call {
	trace("dd", 3, $$parms)
}

probe kernel.function("*@mm/filemap.c").return {
	trace("dd", -3, $$return)
}
probe end {
	printf("vfs_write trace ends\n")
}