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SubjectRe: [PATCH 1/8] Scaling msgmni to the amount of lowmem
Tony Luck wrote:
> On Mon, Feb 11, 2008 at 7:16 AM, <Nadia.Derbey@bull.net> wrote:
>
>> Index: linux-2.6.24-mm1/ipc/msg.c
>> ===================================================================
>> --- linux-2.6.24-mm1.orig/ipc/msg.c 2008-02-07 15:02:29.000000000 +0100
>> +++ linux-2.6.24-mm1/ipc/msg.c 2008-02-07 15:24:19.000000000 +0100
>
> ...
>
>> +out_callback:
>> +
>> + printk(KERN_INFO "msgmni has been set to %d for ipc namespace %p\n",
>> + ns->msg_ctlmni, ns);
>> +}
>
>
> This patch has now made its way to mainline. I can see how this printk
> was really useful to you while developing this patch. But does it add
> much value in a production system? It just looks like another piece of
> clutter on the console to my uncontainerized eyes.
>
> -Tony
>
>


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.
Also, at boot time, I think it's interesting to have the actual msgmni
value: it used to unconditionally be set to 16. Some applications that
used to need an initialization script setting msgmni to a higher value
might not need that script anymore, since the new value might fit their
needs.

Regards,
Nadia


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