linux-kernel - Re: [PATCH 1/2] Extend sys_clone and sys

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Message-ID: <20080123205930.GA5233@ucw.cz>
Date:	Wed, 23 Jan 2008 20:59:30 +0000
From:	Pavel Machek <pavel@....cz>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Containers <containers@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Cedric Le Goater <clg@...ibm.com>,
	Serge Hallyn <serue@...ibm.com>
Subject: Re: [PATCH 1/2] Extend sys_clone and sys_unshare system calls API

On Wed 2008-01-16 15:58:55, Pavel Emelyanov wrote:
> There's only one bit in the clone_flags left, so we won't be able 
> to create more namespaces after we make it busy. Besides, for 
> checkpoint/restart jobs we might want to create tasks with given
> pids (virtual of course). And nobody knows for sure what else might 
> be required from clone() in the future.
> 
> This is an attempt to create a extendable API for clone and unshare.
> Actually this patch is a request for comment about the overall
> design. If it will turn out to "look good", then we'll select some
> better names for new flag and data types.
> 
> I use the last bit in the clone_flags for CLONE_LONGARG. When set it
> will denote that the child_tidptr is not a pointer to a tid storage,
> but the pointer to the struct long_clone_struct which currently 
> looks like this:
> 
> struct long_clone_arg {
> 	int size;
> };

Ugly as night, I'd say. (Al said it better). What about just adding
clone2 syscall, that takes u64?
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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