Hi >> So, I think we don't need to care zonelist, just kswapd turn off >> their own node. > > I don't understand what you mean by this. This was the answer of following your comments. > Instead, couldn't we turn zlc->fullzones off from kswapd? > > > > Which zonelist should it clear (there are two) I mean, buddy list is belong to zone, not zonelist. therefore, kswapd don't need to look up zonelist. So, I'd suggest either following way, - use direct reclaim path, but only clear a zlc bit of zones in reclaimed zonelist, not all. or - use kswapd and only clear a zlc bit at kswap exiting balance_pgdat I'm prefer to add a branch to slowpath (ie reclaim path) rather than fast path. >> And, just curious, If we will have a proper zlc clear point, why >> do we need to keep HZ timeout? > > Yes because we are not guaranteed to call direct reclaim either. Memory > could be freed by a process exiting and I'd rather not add cost to > the free path to find and clear all zonelists referencing the zone the > page being freed belongs to. Ok, it's good trade-off. I agree we need to keep HZ timeout. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>