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authorChris Mason <chris.mason@oracle.com>2009-05-18 10:41:58 -0400
committerChris Mason <chris.mason@oracle.com>2009-06-10 11:29:48 -0400
commit2c943de6ad795a174dcc424c293bb77f15ae3b8c (patch)
tree15e54377cb925312ce0332a6520d78ae99b9fafc
parentcfbb9308463f6dad1334884db046ccf0f1a77918 (diff)
Btrfs: reduce mount -o ssd CPU usage
The block allocator in SSD mode will try to find groups of free blocks that are close together. This commit makes it loop less on a given group size before bumping it. The end result is that we are less likely to fill small holes in the available free space, but we don't waste as much CPU building the large cluster used by ssd mode. Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/free-space-cache.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 0bc93657b46..280165581c5 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -652,7 +652,7 @@ again:
last = entry;
max_extent = 0;
total_retries++;
- if (total_retries % 256 == 0) {
+ if (total_retries % 64 == 0) {
if (min_bytes >= (bytes + empty_size)) {
ret = -ENOSPC;
goto out;