linux-kernel - Re: RFD: Non-Disruptive Core Dump Infrastructure

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Date:	Tue, 03 Sep 2013 16:17:22 +0530
From:	Janani Venkataraman <jananive@...ux.vnet.ibm.com>
To:	Pavel Emelyanov <xemul@...allels.com>
CC:	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Daisuke HATAYAMA <d.hatayama@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...k.frob.com>,
	Amerigo Wang <amwang@...hat.com>,
	Christoph Hellwig <hch@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	avagin@...nvz.org, gorcunov@...nvz.org,
	James Hogan <james.hogan@...tec.com>,
	Mike Frysinger <vapier@...too.org>,
	"Randy.Dunlap" <rdunlap@...otime.net>,
	Eric Paris <eparis@...hat.com>, ananth@...ibm.com,
	suzuki@...ibm.com, aravinda@...ux.vnet.ibm.com,
	tarundeep.singh@...ibm.com
Subject: Re: RFD: Non-Disruptive Core Dump Infrastructure

On 09/03/2013 04:01 PM, Pavel Emelyanov wrote:
> On 09/03/2013 12:39 PM, Janani Venkataraman wrote:
>> Hello,
>>
>> We are working on an infrastructure to create a system core file of a specific
>> process at run-time, non-disruptively. It can also be extended to a case where
>> a process is able to take a self-core dump.
>
> This is very close to what we're trying to do in CRIU. And although image files
> containing info about processes are not ELF files, an ability to generate ELF-cores
> out of existing CRIU images is one of the features that we were asked for.
>
>> 2) CRIU Approach :
>>
>> This makes use of the CRIU tool and checkpoints when a dump is called, collects
>> the required details and continues the running process.
>> * A self dump cannot be initiated using the command line CRIU which is similar
>> to the limitation of gcore.
>
> This is something we're trying to fix at the moment, as people ask for 'self-dump'
> ability as well. We plan to have this implemented in v0.8 (the v0.7 is coming out
> today/tomorrow) in about a month.
>
> I can shed more light on this, if required.
>
>> * A system call to do the same is being implemented which would help us create
>> a self dump.The system call is not upstream yet. We could explore that option as
>> well.
>
> Thanks,
> Pavel
>
Hi,

I would like to know more about the "self-dump" ability of CRIU. This is 
the implementation using system calls if I am not wrong.

Thanking You.
Regards,
Janani Venkataraman

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