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 09:58:24 +0100
From:	Pierre Peiffer <pierre.peiffer@...l.net>
To:	Pavel Emelyanov <xemul@...nvz.org>
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

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 ?

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.

P.

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