[PATCH] ocfs2: Remove expensive bitmap scanning

Enable expensive bitmap scanning only if DEBUG option is enabled.
The bitmap scanning quite loads the CPU and on my machine the write
throughput of dd if=/dev/zero of=/ocfs2/file bs=1M count=500 conv=sync
improves from 37 MB/s to 45.4 MB/s in local mode...

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index d272847d5a07..58ea88b5af36 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -484,6 +484,7 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
 
         alloc = (struct ocfs2_dinode *) osb->local_alloc_bh->b_data;
 
+#ifdef OCFS2_DEBUG_FS
         if (le32_to_cpu(alloc->id1.bitmap1.i_used) !=
             ocfs2_local_alloc_count_bits(alloc)) {
                 ocfs2_error(osb->sb, "local alloc inode %llu says it has "
@@ -494,6 +495,7 @@ int ocfs2_reserve_local_alloc_bits(struct ocfs2_super *osb,
                 status = -EIO;
                 goto bail;
         }
+#endif
 
         free_bits = le32_to_cpu(alloc->id1.bitmap1.i_total) -
                 le32_to_cpu(alloc->id1.bitmap1.i_used);
@@ -712,9 +714,8 @@ static int ocfs2_sync_local_to_main(struct ocfs2_super *osb,
         void *bitmap;
         struct ocfs2_local_alloc *la = OCFS2_LOCAL_ALLOC(alloc);
 
-        mlog_entry("total = %u, COUNT = %u, used = %u\n",
+        mlog_entry("total = %u, used = %u\n",
                    le32_to_cpu(alloc->id1.bitmap1.i_total),
-                   ocfs2_local_alloc_count_bits(alloc),
                    le32_to_cpu(alloc->id1.bitmap1.i_used));
 
         if (!alloc->id1.bitmap1.i_total) {