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SubjectRe: [PATCH -tip 3/3] Add get_signal tracepoint

* Masami Hiramatsu <mhiramat@redhat.com> wrote:

> > - signal IPI/wakeup events
>
> All signals might be used for IPI, isn't it? :-)

I mean, to analyze the various dynamic delivery details of how a signal
send affects a target task:

1) which task/PID was selected to be woken

2) if the task got woken (from sleep) due to the signal sending

3) if it was already woken, whether it needed an IPI via kick_process()

What proportion of signals were wakeups and what proportion hit an
already running task is a relevant question to ask when analyzing the
performance characteristics of signals.

Ingo


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