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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>
This commit is contained in:
Chris Mason 2012-02-06 05:06:18 -05:00
parent 6a4903c8ad
commit b7ad5a8456
1 changed files with 6 additions and 4 deletions
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10
extent_io.c
View File

@ -28,7 +28,8 @@
#include "extent_io.h" #include "extent_io.h"
#include "list.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) 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 extent_buffer *eb;
struct list_head *node, *next; struct list_head *node, *next;
if (tree->cache_size < cache_max) if (tree->cache_size < cache_soft_max)
return 0; return 0;
list_for_each_safe(node, next, &tree->lru) { list_for_each_safe(node, next, &tree->lru) {
eb = list_entry(node, struct extent_buffer, lru); eb = list_entry(node, struct extent_buffer, lru);
if (eb->refs == 1) { if (eb->refs == 1) {
free_extent_buffer(eb); free_extent_buffer(eb);
if (tree->cache_size < cache_max) if (tree->cache_size < cache_hard_max)
break; break;
} else { } else {
list_move_tail(&eb->lru, &tree->lru); list_move_tail(&eb->lru, &tree->lru);
} }
if (nrscan++ > 64) if (nrscan++ > 64 && tree->cache_size < cache_hard_max)
break; break;
} }
return 0; return 0;