linux-kernel - Re: [RFC] [PATCH 00/19] Non disruptive application core dump infrastructure using task_work

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Message-ID: <20131007135805.GA26801@redhat.com>
Date:	Mon, 7 Oct 2013 15:58:05 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Suzuki K. Poulose" <suzuki@...ibm.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Janani Venkataraman <jananive@...ibm.com>,
	linux-kernel@...r.kernel.org, amwang@...hat.com,
	rdunlap@...otime.net, aravinda@...ux.vnet.ibm.com, hch@....de,
	mhiramat@...hat.com, jeremy.fitzhardinge@...rix.com,
	xemul@...allels.com, suzuki@...ux.vnet.ibm.com,
	kosaki.motohiro@...fujitsu.com, adobriyan@...il.com,
	tarundsk@...ux.vnet.ibm.com, vapier@...too.org,
	roland@...k.frob.com, tj@...nel.org, ananth@...ux.vnet.ibm.com,
	gorcunov@...nvz.org, avagin@...nvz.org, eparis@...hat.com,
	d.hatayama@...fujitsu.com, james.hogan@...tec.com,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org
Subject: Re: [RFC] [PATCH 00/19] Non disruptive application core dump
	infrastructure using task_work_add()

On 10/07, Suzuki K. Poulose wrote:
>
> On 10/04/2013 07:14 PM, Andi Kleen wrote:
>
> > Couldn't they just use the new process_vm_readv() syscalls instead?
> > AFAIK those do not require ptrace.
> >
> We need the register set and hence would need a ptrace.

Or the task itself can dump its memory/registers/whatever in responce
to the request from dumper.

gencore_work() is only used to freeze the process, but it can do more?

Oleg.

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