linux-kernel - Re: [RFC][v7][PATCH 0/9] Implement clone2() system call

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Date:	Thu, 24 Sep 2009 13:35:56 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Oren Laadan <orenl@...columbia.edu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...l.org>, torvalds@...ux-foundation.org,
	mikew@...gle.com, mingo@...e.hu, hpa@...or.com,
	Nathan Lynch <nathanl@...tin.ibm.com>, arnd@...db.de,
	peterz@...radead.org,
	Containers <containers@...ts.linux-foundation.org>,
	sukadev@...ibm.com
Subject: Re: [RFC][v7][PATCH 0/9] Implement clone2() system call

Quoting Alexey Dobriyan (adobriyan@...il.com):
> I don't like this even more.
> 
> Pid namespaces are hierarchical _and_ anonymous, so simply
> set of numbers doesn't describe the final object.
> 
> struct pid isn't special, it's just another invariant if you like
> as far as C/R is concerned, but system call is made special wrt pids.
> 
> What will be in an image? I hope "struct kstate_image_pid" with several

Sure pid namespaces are anonymous, but we will give each an 'objref'
valid only for a checkpoint image, and store the relationship between
pid namespaces based on those objrefs.  Basically the same way that user
structs and hierarchical user namespaces are handled right now.

> numbers and with references to such object from other places, so it
> seems natural to do alloc_pid() with needed numbers and that attach new
> shiny pid to where needed. But this clone_pid is only for task_struct's pids.
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