linux-kernel - Re: [PATCH 2.6.24-rc3-mm1] IPC: make struct ipc_ids static in ipc

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Date:	Fri, 23 Nov 2007 12:27:15 +0300
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	Pierre Peiffer <pierre.peiffer@...l.net>
CC:	Cedric Le Goater <clg@...ibm.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org
Subject: Re: [PATCH 2.6.24-rc3-mm1] IPC: make struct ipc_ids static in ipc_namespace

Pierre Peiffer wrote:
> Hi,
> 
> 	Thanks for reviewing this !
> 
> Pavel Emelyanov wrote:
>> Pavel Emelyanov wrote:
>>> Cedric Le Goater wrote:
>>>> Pierre Peiffer wrote:
>> [snip]
>>
>>>> Pavel, what do you think of it ? 
>>> Looks sane, good catch, Pierre.
>>>
>>> But I'd find out whether these three ipc_ids intersect any 
>>> cache-line. In other words I'd mark the struct ipc_ids as
>>> ____cacheline_aligned and checked for any differences.
>> BTW! It might be also useful to keep ipc_ids closer to their
>> sysctl parameters.
>>
> 
> It makes sense indeed.
> 
> That would mean to have something like this, right ?

Yup :)

> struct ipc_namespace {
> 	struct kref	kref;
> 
> 	struct ipc_ids	sem_ids;
> 	int		sem_ctls[4];
> 	int		used_sems;
> 
> 	struct ipc_ids	msg_ids;
> 	int		msg_ctlmax;
> 	int		msg_ctlmnb;
> 	int		msg_ctlmni;
> 	atomic_t	msg_bytes;
> 	atomic_t	msg_hdrs;
> 
> 	struct ipc_ids	shm_ids;
> 	size_t		shm_ctlmax;
> 	size_t		shm_ctlall;
> 	int		shm_ctlmni;
> 	int		shm_tot;
> };
> 
> After a quick look, that implies to rework a little bit procfs... othwise, it's
> not a big deal as I can see.

Thanks!

> P.
> 
>>>> Acked-by: Cedric Le Goater <clg@...ibm.com>
>>>>
>>>> Thanks,
>>> Thanks,
>>> Pavel
>>>
>>>> C.
>> [snip]
>> -
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