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

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Date:	Tue, 14 Dec 2010 20:29:20 +0530
From:	"Suzuki K. Poulose" <suzuki@...ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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

On Tue, 14 Dec 2010 12:54:05 +0200
Alexey Dobriyan <adobriyan@...il.com> wrote:

> On Tue, Dec 14, 2010 at 03:22:59PM +0530, Suzuki K. Poulose wrote:
> > The interface is provided by a /proc/pid/core file, reading which can give the 
> 
> What happens when process opens /proc/self/core ?
The current thread will be skipped for freeze(), and all the others will be 
frozen.We fill in the register states with 0's for the active threads.

> What happens when process opens /proc/self/core and coredumps before close(2).

Thanks for pointing this out. With the current code, this causes a hang for the
 current process, waiting for the other threads to clear. I will think about 
a solution to this making use of the mm->core_state information.


Thanks a lot for the review.

Suzuki
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