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

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Message-ID: <4AFDF9DA.6090308@redhat.com>
Date:	Fri, 13 Nov 2009 19:29:14 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Roland McGrath <roland@...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

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

Agreed, I'll split them.

> 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.  ;-)

Ah, I see. 'deliver_signal' is good to me :-).

Thank you,

> 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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-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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