Re: slab: start_cpu_timer/cache_reap CONFIG_HOTPLUG_CPU problems

[Oleg Nesterov]

On 02/20, Christoph Lameter wrote:
>
> 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.

I personally agree. Besides, cache_reaper is not alone. Note the comment
in debug_smp_processor_id() about cpu-bound processes. The slab does correct
thing right now, stops the timer on CPU_DEAD. Other problems imho should be
solved by fixing cpu-hotplug. Gautham and Srivatsa are working on that.

Oleg.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/