Re: [PATCH 2/2] mm: compaction: Minimise the time IRQs are disabledwhile isolating pages for migration

[KAMEZAWA Hiroyuki]

On Mon, 28 Feb 2011 10:18:27 +0000
Mel Gorman <mel@xxxxxxxxx> wrote:

> > BTW, can't we drop disable_irq() from all lru_lock related codes ?
> > 
> 
> I don't think so - at least not right now. Some LRU operations such as LRU
> pagevec draining are run from IPI which is running from an interrupt so
> minimally spin_lock_irq is necessary.
> 

pagevec draining is done by workqueue(schedule_on_each_cpu()). 
I think only racy case is just lru rotation after writeback.

Thanks,
-Kame

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