[Ksummit-2012-discuss] [ATTEND] Module signing, cpu hotplug and some cpumasks.

Srivatsa S. Bhat srivatsa.bhat at linux.vnet.ibm.com
Mon Jun 25 05:29:06 UTC 2012

On 06/24/2012 12:05 PM, Rusty Russell wrote:

> Hi all,
>         I'd really like to try to get some consensus on module signing,
> since there's the "in the .ko" vs "in an xattr" fight.  I don't really
> care, but it'd be nice to get the players in one place with a deadline,
> such as David Howells, Dmitry Kasatkin, Lucas De Marchi an Jon Masters.
> If we all get there, other module stuff will no doubt come up.
> CPU hotplug is something ARM is using for powersaving, for better or
> worse.  So much for my jokes about waiting for a cpu hotplug rate
> benchmark before any optimization occurred; we're there.  Thomas
> Gleixner's got some great patches, but we're due for a complete rewrite
> IMHO.  It's developed into a real mess, and the -rt guys hate
> stop_machine.

I'm very interested in the CPU hotplug part, and would love to participate
in the discussion around taming that beast.

> Finally, it'd be nice to get consensus on what to do with offstack
> cpumasks.  There are a few final patches sitting in limbo before we can
> actually change cpumask_var_t to only allocate nr_cpus bits.  Would be
> nice to kick them along.

I have been following the cpumask patches and discussions on the mailing
lists with interest, and would like to attend that discussion as well.

Srivatsa S. Bhat

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