As noted by Johannes Weiner, NR_ZONE_WRITE_PENDING gets decremented twice during migration instead of a dec(old) -> inc(new) cycle as intended.
This is a fix to mmotm patch mm-move-most-file-based-accounting-to-the-node.patch Note that it'll cause a conflict with mm-vmstat-remove-zone-and-node-double-accounting-by-approximating-retries.patch but that the resolution is trivial. Signed-off-by: Mel Gorman <[email protected]> --- mm/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/migrate.c b/mm/migrate.c index c77997dc6ed7..ed0268268e93 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -515,7 +515,7 @@ int migrate_page_move_mapping(struct address_space *mapping, __dec_node_state(oldzone->zone_pgdat, NR_FILE_DIRTY); __dec_zone_state(oldzone, NR_ZONE_WRITE_PENDING); __inc_node_state(newzone->zone_pgdat, NR_FILE_DIRTY); - __dec_zone_state(newzone, NR_ZONE_WRITE_PENDING); + __inc_zone_state(newzone, NR_ZONE_WRITE_PENDING); } } local_irq_enable(); -- 2.6.4
