linux-kernel - Re: [RFC][v4][PATCH 0/7] clone_with

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Message-ID: <20090813133256.GA30731@us.ibm.com>
Date:	Thu, 13 Aug 2009 08:32:56 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Oren Laadan <orenl@...columbia.edu>,
	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, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [RFC][v4][PATCH 0/7] clone_with_pids() system call

Quoting Eric W. Biederman (ebiederm@...ssion.com):
> Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com> writes:
> 
> > === NEW CLONE() SYSTEM CALL:
> >
> > To support application checkpoint/restart, a task must 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.
> >
> > This patchset implements a new system call, clone_with_pids() that lets a
> > process specify the pids of the child process.
> >
> > Patches 1 through 5 are helpers and we believe they are needed for application
> > restart, regardless of the kernel implementation of application restart.
> 
> I'm not very impressed.
> 
> - static int alloc_pidmap(struct pid_namespace *pid_ns)
> + static int alloc_pidmap(struct pid_namespace *pid_ns, int pid_max, int last_pid)

Regardless of Suka's patch, note that I did send you a patch back on march 21
to make pid_max a pidns property.  I suspect that's still something we
want. 

-serge
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