linux-kernel - Re: [PATCH v2] [RFC] tracepoint: Add signal coredump tracepoint

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Message-ID: <2f11576a0912042318u4c9c90cetb4ce136e977c2596@mail.gmail.com>
Date:	Sat, 5 Dec 2009 16:18:38 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Jason Baron <jbaron@...hat.com>
Subject: Re: [PATCH v2] [RFC] tracepoint: Add signal coredump tracepoint

2009/12/3 Masami Hiramatsu <mhiramat@...hat.com>:
> Add signal coredump tracepoint which shows signal number,
> mm->flags, limits, pointer to file structure and core
> file name.
>
> This tracepoint requirement comes mainly from the viewpoint of
> administrators. Since now we have introduced many coredump
> configurations (e.g. dumpable, coredump_filter, core_pattern,
> etc) and some of them can be modified by users, it will be hard
> to know what was actually dumped (or not dumped) after some
> problem happened on the system. For example, a process didn't
> generated core, coredump doesn't have some sections, etc.
> In those cases, the coredump tracepoint can help us to know
> why the core file is so big or small, or not generated, by
> recording all configurations for all processes on the system.
> That will reduce system-administration cost.

AFAIK, not-dumped case is important than dump successful case.
IOW, admin need to know why the crashed process was not dumped.

This tracepoint doesn't cover all failure case. especially
binfmt->core_dump() et.al.
IOW, this tracepoint seems too specialized piped-coredump feature.

What do you think this tracepoint's use case?
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