Re: [PATCH] mm, vmscan: make kswapd unreserve highatomic pageblocks

["Jose A. Perez de Azpillaga" <azpijr@gmail.com>]

On 11/4/26 7:38 PM, Vlastimil Babka (SUSE) wrote:
> Hook this highatomic unreserve to the moment we are increasing kswapd
> reclaim priority, as that is when kswapd is struggling to make progress
> and it should roughly match the case of direct reclaim failure.
> 

isn't raise_priority true after almost every pass at DEF_PRIORITY, stuck
or not?

[snip]

> +		if (raise_priority || !nr_reclaimed) {
> +			/*
> +			 * Similarly to when direct reclaim is retrying, try to
> +			 * unreserve highatomic pageblocks on the node. Convert
> +			 * them to movable ones as kswapd doesn't have a target
> +			 * migratetype, and passing unmovable should lead to
> +			 * least permanent fragmentation.
> +			 */
> +			for (int i = 0; i <= highest_zoneidx; i++) {
> +				struct zone *zone = pgdat->node_zones + i;
> +
> +				unreserve_highatomic_pageblock_zone(zone,
> +						MIGRATE_UNMOVABLE, false);
> +			}
s/movable/unmovable/ in the comment?

-- 
cheers,
jose a. p-a