[PATCH] zone_reclaim: reclaim on memory only node support (42c722d4) · Commits · 戴 / test

Zone reclaim is usually only run on the local node. Headless nodes do not have any local processors. This patch checks for headless nodes and performs zone reclaim on them. Signed-off-by:

Christoph Lameter <clameter@sgi.com> Signed-off-by:

Andy Whitcroft <apw@shadowen.org> Signed-off-by:

Andrew Morton <akpm@osdl.org> Signed-off-by:

Linus Torvalds <torvalds@osdl.org>

mm/vmscan.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -1599,17 +1599,23 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
		struct task_struct *p = current;
		struct reclaim_state reclaim_state;
		struct scan_control sc;
		cpumask_t mask;
		int node_id;

		if (time_before(jiffies,
		zone->last_unsuccessful_zone_reclaim + ZONE_RECLAIM_INTERVAL))
		return 0;

		if (!(gfp_mask & __GFP_WAIT) \|\|
		zone->zone_pgdat->node_id != numa_node_id() \|\|
		zone->all_unreclaimable \|\|
		atomic_read(&zone->reclaim_in_progress) > 0)
		return 0;

		node_id = zone->zone_pgdat->node_id;
		mask = node_to_cpumask(node_id);
		if (!cpus_empty(mask) && node_id != numa_node_id())
		return 0;

		sc.may_writepage = 0;
		sc.may_swap = 0;
		sc.nr_scanned = 0;

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