linux-kernel - Re: [PATCH 7/8] Do not recompute msgmni anymore if explicitely set by user

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Date:	Tue, 12 Feb 2008 10:45:27 +0100
From:	Nadia Derbey <Nadia.Derbey@...l.net>
To:	Nadia Derbey <Nadia.Derbey@...l.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, cmm@...ibm.com,
	matthltc@...ibm.com
Subject: Re: [PATCH 7/8] Do not recompute msgmni anymore if explicitely set
 by user

Nadia Derbey wrote:
> Andrew Morton wrote:
> 
>> On Mon, 11 Feb 2008 15:16:53 +0100
>> Nadia.Derbey@...l.net wrote:
>>
>>
>>> [PATCH 07/08]
>>>
>>> This patch makes msgmni not recomputed anymore upon ipc namespace 
>>> creation /
>>> removal or memory add/remove, as soon as it has been set from userland.
>>>
>>> As soon as msgmni is explicitely set via procfs or sysctl(), the 
>>> associated
>>> callback routine is unregistered from the ipc namespace notifier chain.
>>>
>>
>>
>> The patch series looks pretty good.
>>
>>
>>> ===================================================================
>>> --- linux-2.6.24-mm1.orig/ipc/ipc_sysctl.c    2008-02-08 
>>> 16:07:15.000000000 +0100
>>> +++ linux-2.6.24-mm1/ipc/ipc_sysctl.c    2008-02-08 
>>> 16:08:32.000000000 +0100
>>> @@ -35,6 +35,24 @@ static int proc_ipc_dointvec(ctl_table *
>>>     return proc_dointvec(&ipc_table, write, filp, buffer, lenp, ppos);
>>> }
>>>
>>> +static int proc_ipc_callback_dointvec(ctl_table *table, int write,
>>> +    struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
>>> +{
>>> +    size_t lenp_bef = *lenp;
>>> +    int rc;
>>> +
>>> +    rc = proc_ipc_dointvec(table, write, filp, buffer, lenp, ppos);
>>> +
>>> +    if (write && !rc && lenp_bef == *lenp)
>>> +        /*
>>> +         * Tunable has successfully been changed from userland:
>>> +         * disable its automatic recomputing.
>>> +         */
>>> +        unregister_ipcns_notifier(current->nsproxy->ipc_ns);
>>> +
>>> +    return rc;
>>> +}
>>
>>
>>
>> If you haven't done so, could you please check that it all builds cleanly
>> with CONFIG_PROCFS=n, and that all code which isn't needed if procfs is
>> disabled is not present in the final binary?
>>
>>
>>
>>
> 
> Andrew,
> 
> it builds fine, modulo some changes in ipv4 and ipv6 (see attached patch 
> - didn't find it in the hot fixes).
> 
> Regards,
> Nadia
> 
> 

Oops, forgot the patch. Thx Benjamin!




View attachment "ip_v4_v6_procfs.patch" of type "text/x-patch" (1958 bytes)