linux-kernel - Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call filtering

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Message-ID: <20110526185045.GA3476@elte.hu>
Date:	Thu, 26 May 2011 20:50:45 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Valdis.Kletnieks@...edu
Cc:	Avi Kivity <avi@...hat.com>, James Morris <jmorris@...ei.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kees Cook <kees.cook@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Will Drewry <wad@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, gnatapov@...hat.com,
	Chris Wright <chrisw@...s-sol.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 3/5] v2 seccomp_filters: Enable ftrace-based system call
 filtering


* Valdis.Kletnieks@...edu <Valdis.Kletnieks@...edu> wrote:

> On Thu, 26 May 2011 20:36:35 +0200, Ingo Molnar said:
> 
> > I suspect we are really offtopic here, but an initial rsync, then 
> > stopping the guest, final rsync + restart the guest at the target 
> > would work with minimal interruption.
> 
> Actually, after you kick off the migrate, you really want to be 
> tracking in real time what pages get dirtied while you're doing the 
> initial copy, so that the second rsync doesn't have to walk through 
> the file finding the differences.  But that requires some extra 
> instrumentation.

Yeah, and that's how socket based live migration works - it's 
completely seemless.

But note that the rsync re-scan should not be an issue: both the 
source and the target system will obviously have a *lot* more RAM 
than the guest RAM image size.

Thanks,

	Ingo
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