linux-kernel - Re: [PATCH 4/16] Change data structures for pid namespaces

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Message-ID: <46937691.5030409@fr.ibm.com>
Date:	Tue, 10 Jul 2007 14:07:45 +0200
From:	Cedric Le Goater <clg@...ibm.com>
To:	Pavel Emelianov <xemul@...nvz.org>
CC:	sukadev@...ibm.com, Andrew Morton <akpm@...l.org>,
	Serge Hallyn <serue@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kirill Korotaev <dev@...nvz.org>
Subject: Re: [PATCH 4/16] Change data structures for pid namespaces

>> | > +
>> | >  struct pid
>> | >  {
>> | >  	atomic_t count;
>> | > @@ -40,6 +40,8 @@ enum pid_type
>> | >  	/* lists of tasks that use this pid */
>> | >  	struct hlist_head tasks[PIDTYPE_MAX];
>> | >  	struct rcu_head rcu;
>> | > +	int level;
>> | > +	struct pid_number numbers[1];
>> | >  };
>> | > 
>> | >  extern struct pid init_struct_pid;
>> | > diff -upr linux-2.6.22-rc4-mm2.orig/include/linux/pid_namespace.h linux-2.6.22-rc4-mm2-2/include/linux/pid_namespace.h
>> | > --- linux-2.6.22-rc4-mm2.orig/include/linux/pid_namespace.h	2007-06-14 12:14:29.000000000 +0400
>> | > +++ linux-2.6.22-rc4-mm2-2/include/linux/pid_namespace.h	2007-07-04 19:00:39.000000000 +0400
>> | > @@ -16,7 +15,10 @@ struct pidmap {
>> | >  	struct kref kref;
>> | >  	struct pidmap pidmap[PIDMAP_ENTRIES];
>> | >  	int last_pid;
>> | > +	int level;
>> | >  	struct task_struct *child_reaper;
>> | > +	struct kmem_cache *pid_cachep;
>> | 
>> | so, that looks like a good idea to have the cache in the pidmap. could you 
>> | push that independently to see how it all fits together ?
>>
>> Yes. I like this idea too.
> 
> OK. I will collect the patches you Acked and send them to Andrew independently.

good thanks, 

however that part on the *pid_cachep will require some rework on your patchset.

C.
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