On Thu, 28 Nov 2024 11:02:31 -0500 Mathieu Desnoyers <mathieu.desnoy...@efficios.com> wrote:
> > A better solution is for there to be a return code or something where the > > tracers (perf or ftrace) can record in the trace that the system call is > > not supported. > > Just be careful not to spam the traces uselessly. E.g. if only the > openat syscall is enabled, you'd only want to be made aware of the > ia32 openat, not all ia32 syscalls. Why not? If you ask to trace something that isn't able to be traced, add something in the buffer. It's not totally useless information. If anything, you know that a task is making ia32 system calls, and how many and when they are doing so. Why make it more complex than it has to be. To do it only once, you need to add the accounting logic to make sure each trace gets notified about it. Not to mention if the event gets dropped. If the user doesn't want this in their buffer, then they should filter it out. -- Steve
