On Tue, 14 Aug 2007, Andi Kleen wrote: > > But that still creates lots of overhead each time we take the lru lock! > > A lot of overhead in what way? Setting a flag in a cache hot > per CPU data variable shouldn't be more than a few cycles.
Could you be a bit more specific? Where do you want to place the data? What we are talking about is atomic_inc(&zone->reclaim_cpu[smp_processor_id()]); smp_wmb(); spin_lock(&zone->lru_lock); .... spin_unlock(&zone_lru_lock); smp_wmb(); atomic_dec(&zone->reclaim_cpu[smp_processor_id()]); That is not light weight. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
