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Subject[RFC 5/7] Laundry handling for direct reclaim
Direct reclaim collects a global laundry list in try_to_free_pages().

Pages are only written back after a reclaim pass is complete.

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

---
mm/vmscan.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c 2007-08-19 23:30:15.000000000 -0700
+++ linux-2.6/mm/vmscan.c 2007-08-19 23:53:43.000000000 -0700
@@ -1099,7 +1099,7 @@ static unsigned long shrink_zone(int pri
* scan then give up on it.
*/
static unsigned long shrink_zones(int priority, struct zone **zones,
- struct scan_control *sc)
+ struct scan_control *sc, struct list_head *laundry)
{
unsigned long nr_reclaimed = 0;
int i;
@@ -1121,7 +1121,7 @@ static unsigned long shrink_zones(int pr

sc->all_unreclaimable = 0;

- nr_reclaimed += shrink_zone(priority, zone, sc, NULL);
+ nr_reclaimed += shrink_zone(priority, zone, sc, laundry);
}
return nr_reclaimed;
}
@@ -1156,6 +1156,7 @@ unsigned long try_to_free_pages(struct z
.swappiness = vm_swappiness,
.order = order,
};
+ LIST_HEAD(laundry);

count_vm_event(ALLOCSTALL);

@@ -1170,16 +1171,19 @@ unsigned long try_to_free_pages(struct z
}

for (priority = DEF_PRIORITY; priority >= 0; priority--) {
+
sc.nr_scanned = 0;
if (!priority)
disable_swap_token();
- nr_reclaimed += shrink_zones(priority, zones, &sc);
+ nr_reclaimed += shrink_zones(priority, zones, &sc, &laundry);
shrink_slab(sc.nr_scanned, gfp_mask, lru_pages);
if (reclaim_state) {
nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
}
+
total_scanned += sc.nr_scanned;
+
if (nr_reclaimed >= sc.swap_cluster_max) {
ret = 1;
goto out;
@@ -1223,6 +1227,8 @@ out:

zone->prev_priority = priority;
}
+ nr_reclaimed += shrink_page_list(&laundry, &sc, NULL);
+ release_lru_pages(&laundry);
return ret;
}

--
-
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