linux-kernel - Re: [RFC] on general object IDs again

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Message-ID: <20120111175952.GI466@moon>
Date:	Wed, 11 Jan 2012 21:59:52 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kyle Moffett <kyle@...fetthome.net>, Tejun Heo <tj@...nel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrey Vagin <avagin@...nvz.org>
Subject: Re: [RFC] on general object IDs again

On Wed, Jan 11, 2012 at 12:25:04PM -0500, KOSAKI Motohiro wrote:
> > In turn doing everything in a manner of syscall "compare resources of two pids"
> > gives up very slow speed because we will have to compare every pid resources
> > with every other pids we're checkpointing.
> 
> Could you please write down pseudo code of your userland compare logic? When
> and why do you need? I still don't like this idea, but maybe I need to
> understand your
> requerement before putting negative comments.
> 

Hi Kosaki,

the idea on user-space is something like

 - collect all pids to dump
 - collect IDs for every pid
 - sort the IDs obtained
 - find the same IDs (which will be kind of find intersections in a sets of IDs) and
   set up CLONE_ flags on restore procedure as appropriate (for example if
   GEN_OBJ_ID_VM IDs for two or more tasks are the same we need to use CLONE_VM
   at restore time, and so on).

	Cyrill
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