https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213962
Bug ID: 213962
Summary: dtrace tick provider is not implemented correctly
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
>From the DTrace manual
The arguments to profile probes are as follows:
arg0
The program counter (PC) in the kernel at the time that the probe fired, or 0
if the current process was not executing in the kernel at the time that the
probe fired
arg1
The PC in the user-level process at the time that the probe fired, or 0 if the
current process was executing at the kernel at the time that the probe fired
As the descriptions imply, if arg0 is non-zero then arg1 is zero; if arg0 is
zero then arg1 is non-zero. Thus, you can use arg0 and arg1 to differentiate
user-level from kernel level, as in this simple example:
profile-1ms
{
@ticks[arg0 ? "kernel" : "user"] = count();
}
This also fails the t_dtrace_contrib:tst_argtest_d test
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