linux-kernel - Re: [RFC][v4][PATCH 7/7]: Define clone_with

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Message-ID: <20090810222619.GA4805@us.ibm.com>
Date:	Mon, 10 Aug 2009 15:26:19 -0700
From:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-kernel@...r.kernel.org, Oren Laadan <orenl@...columbia.edu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, serue@...ibm.com,
	Alexey Dobriyan <adobriyan@...il.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Andrew Morton <akpm@...l.org>, torvalds@...ux-foundation.org,
	mikew@...gle.com, mingo@...e.hu, hpa@...or.com,
	Containers <containers@...ts.linux-foundation.org>,
	sukadev@...ibm.com
Subject: Re: [RFC][v4][PATCH 7/7]: Define clone_with_pids syscall

Pavel Machek [pavel@....cz] wrote:
| Hi!
| 
| > 
| > Subject: [RFC][v4][PATCH 7/7]: Define clone_with_pids syscall
| > 
| > Container restart requires that a task have the same pid it had when it was
| > checkpointed. When containers are nested the tasks within the containers
| > exist in multiple pid namespaces and hence have multiple pids to specify
| > during restart.
| > 
| > clone_with_pids(), intended for use during restart, is the same as clone(),
| > except that it takes a 'target_pid_set' paramter. This parameter lets caller
| > choose specific pid numbers for the child process, in the process's active
| > and ancestor pid namespaces. (Descendant pid namespaces in general don't
| > matter since processes don't have pids in them anyway, but see comments
| > in copy_target_pids() regarding CLONE_NEWPID).
| 
| This should go to documentation/manpage somewhere.

Agree. Will update once we have some consensus on the interface.

The interface defined in this patch 7/7 

	syscall(__NR_clone_with_pids, flags, stack, NULL, NULL, NULL, &pid_set);

meets the requirements of checkpoint/restart. But as mentioned in patch 0/7,
we are just not sure if we should take this opportunity to address the
clone-flags limitation so we are not forced to define another flavor of
clone() soon.

Sukadev
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