linux-kernel - Re: [RFC][PATCH 8/8] check files for checkpointability

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Date:	Mon, 02 Mar 2009 09:58:26 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	Nathan Lynch <ntl@...ox.com>,
	containers <containers@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	hch@...radead.org, Ingo Molnar <mingo@...e.hu>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [RFC][PATCH 8/8] check files for checkpointability

On Mon, 2009-03-02 at 11:44 -0600, Serge E. Hallyn wrote:
> Which is what we actually do, right?
> 
> Actually we have userspace create the tasks first, and
> then each task calls sys_restart which does restore_files().

Quoting:

http://git.ncl.cs.columbia.edu/?p=linux-cr.git;a=commitdiff;h=3c1b1900f92ed12f5020a7b566065bffda2908d8;hp=7aec1a8f3345bb33c3f93226c895a45ec269bb59

> Restarting of multiple processes expects all restarting tasks to call
> sys_restart(). Once inside the system call, each task will restart
> itself at the same order that they were saved. The internals of the
> syscall will take care of in-kernel synchronization bewteen tasks.

I guess it is OK since everybody sleeps once they enter sys_restart()
until the container init decides it is ready to go.  

-- Dave

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