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

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Date:	Wed, 07 May 2008 07:37:11 +0200
From:	Nadia Derbey <Nadia.Derbey@...l.net>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	"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

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?
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.

Regards,
Nadia

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