Re: slab: start_cpu_timer/cache_reap CONFIG_HOTPLUG_CPU problems

[Christoph Lameter]

On Tue, 20 Feb 2007, Max Krasnyansky wrote:

> > > Well seems that we have a set of unresolved issues with workqueues and cpu
> > > hotplug.
> 
> How about storing 'cpu' explicitly in the work queue instead of relying on the
> smp_processor_id() and friends ? That way there is no ambiguity when
> threads/timers get
> moved around.

The slab functionality is designed to work on the processor with the 
queue. These tricks will only cause more trouble in the future. The 
cache_reaper needs to be either disabled or run on the right processor. It 
should never run on the wrong processor.

The cache_reaper() is of no importance to hotplug. You just need to make 
sure that it is not in the way (disable it and if its running wait 
until the cache_reaper has finished).

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