[PATCH] ZVC/zone_reclaim: Leave 1% of unmapped pagecache pages for file I/O

[pandora-kernel.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3e792a5..54a4f53 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2005,6 +2005,10 @@ static void __meminit free_area_init_core(struct pglist_data *pgdat,
 
                zone->spanned_pages = size;
                zone->present_pages = realsize;
+#ifdef CONFIG_NUMA
+               zone->min_unmapped_ratio = (realsize*sysctl_min_unmapped_ratio)
+                                               / 100;
+#endif
                zone->name = zone_names[j];
                spin_lock_init(&zone->lock);
                spin_lock_init(&zone->lru_lock);
@@ -2298,6 +2302,24 @@ int min_free_kbytes_sysctl_handler(ctl_table *table, int write,
        return 0;
 }
 
+#ifdef CONFIG_NUMA
+int sysctl_min_unmapped_ratio_sysctl_handler(ctl_table *table, int write,
+       struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
+{
+       struct zone *zone;
+       int rc;
+
+       rc = proc_dointvec_minmax(table, write, file, buffer, length, ppos);
+       if (rc)
+               return rc;
+
+       for_each_zone(zone)
+               zone->min_unmapped_ratio = (zone->present_pages *
+                               sysctl_min_unmapped_ratio) / 100;
+       return 0;
+}
+#endif
+
 /*
  * lowmem_reserve_ratio_sysctl_handler - just a wrapper around
  *     proc_dointvec() so that we can call setup_per_zone_lowmem_reserve()