linux-kernel - Re: [PATCH 1/8] Scaling msgmni to the amount of lowmem

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Message-ID: <20080507131712.GA8580@sergelap.austin.ibm.com>
Date:	Wed, 7 May 2008 08:17:12 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Nadia Derbey <Nadia.Derbey@...l.net>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, cmm@...ibm.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/8] Scaling msgmni to the amount of lowmem

Quoting Nadia Derbey (Nadia.Derbey@...l.net):
> Serge E. Hallyn wrote:
>> Quoting Luck, Tony (tony.luck@...el.com):
>>>> Well, this printk had been suggested by somebody (sorry I don't remember 
>>>> who) when I first submitted the patch. Actually I think it might be 
>>>> useful for a sysadmin to be aware of a change in the msgmni value: we 
>>>> have the message not only at boot time, but also each time msgmni is 
>>>> recomputed because of a change in the amount of memory.
>>>
>>> If the message is directed at the system administrator, then it would
>>> be nice if there were some more meaningful way to show the namespace
>>> that is affected than just printing the hex address of the kernel 
>>> structure.
>>>
>>> As the sysadmin for my test systems, printing the hex address is mildly
>>> annoying ... I now have to add a new case to my scripts that look at
>>> dmesg output for unusual activity.
>>>
>>> Is there some better "name for a namespace" than the address? Perhaps
>>> the process id of the process that instantiated the namespace???
>> I agree with Tony here.  Aside from the nuisance it is to see that
>> message on console every time I unshare a namespace, a printk doesn't
>> seem like the right way to output the info.
>
> But you agree that this is happening only because you're doing tests 
> related to namespaces, right?

Yup :)

> I don't think that in a "standard" configuration this will happen very 
> frequently, but may be I'm wrong.
>
>>  At most I'd say an audit
>> message.
>
> That's a good idea. Thanks, Serge. I'll do that.

It'll probably still end up a printk for me, but it'll be my own fault
for not setting up audit.

> Regards,
> Nadia

thanks,
-serge
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