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

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Message-ID: <52524FAA.1030901@in.ibm.com>
Date:	Mon, 07 Oct 2013 11:37:38 +0530
From:	"Suzuki K. Poulose" <suzuki@...ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	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, oleg@...hat.com,
	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 10/04/2013 07:14 PM, Andi Kleen wrote:
> On Fri, Oct 04, 2013 at 04:00:12PM +0530, Janani Venkataraman wrote:
>> Hi all,
>>
>> The following series implements an infrastructure for capturing the core of an 
>> application without disrupting its process.
> 
> The problem is that gcore et.al. have to stop the process briefly
> to attach and then use the pid mmap ptrace interfaces, right?
> 
Correct.

> 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.

> Then this could be all done in user space.
> 
> Or are there some specific races with this approach?
> 
Cheers
Suzuki

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