Allow extent_buffers to use more ram

This changes free_some_buffers (called each time we allocate an extent
buffer) to allow a higher hard limit on the number of extent buffers
in use.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/extent_io.c b/extent_io.c
index 9990338..ebb35b2 100644 (file)
--- a/extent_io.c
+++ b/extent_io.c
@@ -28,7 +28,8 @@
 #include "extent_io.h"
 #include "list.h"
 
-u64 cache_max = 1024 * 1024 * 32;
+u64 cache_soft_max = 1024 * 1024 * 256;
+u64 cache_hard_max = 1 * 1024 * 1024 * 1024;
 
 void extent_io_tree_init(struct extent_io_tree *tree)
 {
@@ -540,18 +541,19 @@ static int free_some_buffers(struct extent_io_tree *tree)
        struct extent_buffer *eb;
        struct list_head *node, *next;
 
-       if (tree->cache_size < cache_max)
+       if (tree->cache_size < cache_soft_max)
                return 0;
+
        list_for_each_safe(node, next, &tree->lru) {
                eb = list_entry(node, struct extent_buffer, lru);
                if (eb->refs == 1) {
                        free_extent_buffer(eb);
-                       if (tree->cache_size < cache_max)
+                       if (tree->cache_size < cache_hard_max)
                                break;
                } else {
                        list_move_tail(&eb->lru, &tree->lru);
                }
-               if (nrscan++ > 64)
+               if (nrscan++ > 64 && tree->cache_size < cache_hard_max)
                        break;
        }
        return 0;