linux-kernel - Re: [RFC][v7][PATCH 8/9]: Define clone2() syscall

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Message-ID: <alpine.LFD.2.01.0909291207410.6996@localhost.localdomain>
Date:	Tue, 29 Sep 2009 12:10:50 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	Roland McGrath <roland@...hat.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Arnd Bergmann <arnd@...db.de>,
	Containers <containers@...ts.linux-foundation.org>,
	Nathan Lynch <nathanl@...tin.ibm.com>,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>, mingo@...e.hu,
	Alexey Dobriyan <adobriyan@...il.com>,
	Pavel Emelyanov <xemul@...nvz.org>, linux-api@...r.kernel.org,
	kosaki.motohiro@...fujitsu.com
Subject: Re: [RFC][v7][PATCH 8/9]: Define clone2() syscall



On Tue, 29 Sep 2009, Arjan van de Ven wrote:
> > 
> > We already have a syscall layer which is painful to thunk in places,
> > and this would make it much worse.
> 
> syscalls are cheap as well.
> cheaper than decades of dealing with such multiplexer mess ;/

Well, I'd agree, except the clone flags really _are_ about multiplexer 
issues, and the new flag woudln't really change anything. 

If the new system call actually had appreciably separate code-paths, I'd 
buy the "multiplexer" argument. But it doesn't really. It's going to call 
down to the same basic clone functionality, and the core clone code ends 
up de-multiplexing the cases anyway.

So this would not at all be like the socket calls (to pick the traditional 
Linux system call multiplexing example) in that sense.

			Linus
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