[PATCH] factor free memory into max_sane_readahead()

max_sane_readahead() permits the user to readahead up to
half-the-inactive-list's worth of pages.  Which is totally wrong if most of
memory is free.

So make the limit be

	(nr_inactive + nr_free) / 2

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 14ce2049de71..bcb57ed21a8d 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -193,7 +193,8 @@ typedef struct pglist_data {
 extern int numnodes;
 extern struct pglist_data *pgdat_list;
 
-void get_zone_counts(unsigned long *active, unsigned long *inactive);
+void get_zone_counts(unsigned long *active, unsigned long *inactive,
+			unsigned long *free);
 void build_all_zonelists(void);
 void wakeup_kswapd(struct zone *zone);