linux-kernel - Re: [PATCH -tip 3/3] Add get

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Message-Id: <20091113235333.0E3CC15E8@magilla.sf.frob.com>
Date:	Fri, 13 Nov 2009 15:53:33 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: Re: [PATCH -tip 3/3] Add get_signal tracepoint

This is orthogonal to the core-dump tracepoint, I don't see why you
call them a unified patch series.

The proper name for this event is "signal delivery".  But since the
proper name for "send_signal" is "signal generation", I suppose "get"
is analogously improper to the existing "send" tracepoint.  ;-)

Especially if you call this "get" rather than "deliver", there is
another place that should invoke this tracepoint (or perhaps a third
one).  sys_rt_sigtimedwait "gets" a signal without delivering it.  In
POSIX terminology this is called "accepting" the signal: the three
things that can happen in the life of a signal are "generate",
"deliver", and "accept".  If you are trying to match up what happened to
a signal generated by kill() or whatnot, then you want to notice both
delivery and acceptance as the complementary event.

(And again I have no clue why this signal stuff should be called
"sched" at all.)

Thanks,
Roland
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