linux-kernel - Re: [PATCH] pidns: Fix wait for zombies to be reaped in zap_pid_ns

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Message-ID: <20100713223450.GA16889@hallyn.com>
Date:	Tue, 13 Jul 2010 17:34:50 -0500
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	Linux Containers <containers@...ts.osdl.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: Re: [PATCH] pidns: Fix wait for zombies to be reaped in
 zap_pid_ns_processes

Quoting Louis Rilling (Louis.Rilling@...labs.com):
> Hi Eric,
> 
> On 12/07/10 11:09 -0700, Eric W. Biederman wrote:
> This patch looks like it is working (only a small RCU issue shown below). I
> couldn't try it yet though.
> 
> I must admit that I am using a similar back-off solution in Kerrighed (not to
> solve the issue of proc_flush_task(), but for one of the reasons that you stated
> above: we want to be sure that all tasks of the namespace have been reaped), but
> I considered it too ugly to propose it for Linux ;)
> 
> That said, this is probably the least intrusive solution we have seen yet.

Yeah I haven't had a chance to look at it in detail, but this looks
right.  Thanks, Eric.

-serge
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