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Re: [RFC PATCH 0/4] [RESEND] Change default MSGMNI tunable to scale with lowmem [message #26104] Tue, 15 January 2008 15:30
Nadia Derbey is currently offline  Nadia Derbey
Messages: 114
Registered: January 2008
Senior Member
Resending with the right address for the containers mailing list.
So sorry...

Nadia Derbey wrote:
> Hi,
> Yesterday, I posted to lkml a series of patches that make the ipc 
> tunable msgmni scale with lowmem (see thread 
> Since these patches watch for memory hotplug notifications, I thought 
> that comments from linux-mm people would be interesting.
> Also, since these patches change the ipc_namespace structure, comments 
> from people subscribed at the containers mailing list would be welcome too.
> Notes:
> 1) please, Cc me since I'm not subscribed to linux-mm.
> 2) sorry for lkml subsribers who are receiving this mail for the 2nd 
> time, but I wanted all the comments to be shared.
> Here is patch 0, the complete series can be found in the thread 
> mentioned above.
> -----------------
> On large systems we'd like to allow a larger number of message queues. 
> In some cases up to 32K. However simply setting MSGMNI to a larger value 
> may cause problems for smaller systems.
> The first patch of this series introduces a default maximum number of 
> message queue ids that scales with the amount of lowmem.
> Since msgmni is per namespace and there is no amount of memory dedicated 
> to each namespace so far, the second patch of this series scales msgmni 
> to the number of ipc namespaces.
> In the last patch, a notifier block is added to the ipc namespace 
> structure to manage memory hotplug. The callback routine is activated 
> upon memory add/remove and it recomputes msgmni. One callback routine is 
> added to the memory notifier chain each time an ipc namespace is 
> allocated. It is removed when the coresponding ipc namespace is freed.
> I still have 1 issue that I'll try to solve next:
>   . use the notification mechanism to recompute all the msg_ctlmni each
>     time an ipc namespace is created / removed.
> These patches should be applied to 2.6.24-rc7, in the following order:
> [PATCH 1/4]: ipc_scale_msgmni_with_lowmem.patch
> [PATCH 2/4]: ipc_scale_msgmni_with_namespaces.patch
> [PATCH 3/4]: ipc_slab_memory_callback_prio_to_const.patch
> [PATCH 4/4]: ipc_recompute_msgmni_on_memory_hotplug.patch
> Regards,
> Nadia

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