linux-kernel - Re: [RFC] [Patch 0/21] Non disruptive application core dump infrastructure

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Message-ID: <20101215115153.GB22304@basil.fritz.box>
Date:	Wed, 15 Dec 2010 12:51:54 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Suzuki K. Poulose" <suzuki@...ibm.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Christoph Hellwig <hch@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Daisuke HATAYAMA <d.hatayama@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>,
	Amerigo Wang <amwang@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] [Patch 0/21] Non disruptive application core dump
 infrastructure

> 1) A process can trigger a core synchronously, upon an event, say a signal 
> handler and continue from there. gcore would require a fork(), which is not 
> safe to use from a signal handler.

Why is it not safe for a signal?

>From the kernel side it should be. glibc may do some funky things
on fork, but you could always call the syscall directly.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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