linux-kernel - Re: [PATCH] fs: limit maximum concurrent coredumps

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Message-ID: <4C203439.6050601@zytor.com>
Date:	Mon, 21 Jun 2010 20:55:37 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Roland McGrath <roland@...hat.com>
CC:	Edward Allcutt <edward@...cutt.me.uk>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Dave Young <hidave.darkstar@...il.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Neil Horman <nhorman@...driver.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] fs: limit maximum concurrent coredumps

On 06/21/2010 06:23 PM, Roland McGrath wrote:
> A core dump is just an instance of a process suddenly reading lots of its
> address space and doing lots of filesystem writes, producing the kinds of
> thrashing that any such instance might entail.

It is, although with one possibly important difference: the process has
had an involuntary state transition, which may mean that its priority
settings that it had as a "live" process are no longer applicable.  It
would certainly seem appropriate to give the administrator the option of
altering the priority parameters of coredumping processes.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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