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[PATCH] zone_reclaim: reclaim on memory only node support 

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>
This commit is contained in:
Christoph Lameter 2006-02-01 03:05:26 -08:00 committed by Linus Torvalds
parent 8928862398
commit 42c722d4cb
1 changed files with 7 additions and 1 deletions
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8
mm/vmscan.c
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@ -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;