linux-kernel - Re: [GIT PULL] tracing: make signal tracepoints more useful

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Message-ID: <20120117145540.GA12626@redhat.com>
Date:	Tue, 17 Jan 2012 15:55:40 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Seiji Aguchi <saguchi@...hat.com>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [GIT PULL] tracing: make signal tracepoints more useful

On 01/17, Steven Rostedt wrote:
>
> People are adding tracepoints all over the kernel without much thought.

Including the tracepoints in __send_signal(). They are stupid and limited.

Yes, I should blame myself in the first place. I was cc'ed, I participated
in the discussion when they were added.

> We take much more care when we add a system call. By making tracepoints
> have as strict a ABI as system calls will cause a maintenance nightmare
> in the future. I guarantee that!

Personally I agree.

That said, I am going to send the patch which adds the new tracepoint
unless Ingo changes his mind. The new info was requested by users who
actually use these events.

Oleg.

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