On Wed, 10 Apr 2024 at 15:56, Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
>
> On Mon, 8 Apr 2024 11:01:54 +0200
> Marco Elver <elver@xxxxxxxxxx> wrote:
>
> > Add "new_exec" tracepoint, which is run right after the point of no
> > return but before the current task assumes its new exec identity.
> >
> > Unlike the tracepoint "sched_process_exec", the "new_exec" tracepoint
> > runs before flushing the old exec, i.e. while the task still has the
> > original state (such as original MM), but when the new exec either
> > succeeds or crashes (but never returns to the original exec).
> >
> > Being able to trace this event can be helpful in a number of use cases:
> >
> > * allowing tracing eBPF programs access to the original MM on exec,
> > before current->mm is replaced;
> > * counting exec in the original task (via perf event);
> > * profiling flush time ("new_exec" to "sched_process_exec").
> >
> > Example of tracing output ("new_exec" and "sched_process_exec"):
>
> nit: "new_exec" name a bit stands out compared to other events, and hard to
> expect it comes before or after "sched_process_exec". Since "begin_new_exec"
> is internal implementation name, IMHO, it should not exposed to user.
> What do you think about calling this "sched_prepare_exec" ?
I like it, I'll rename it to sched_prepare_exec.
Thanks!
