Btrfs: add allocator tracepoints

I used these tracepoints when figuring out what the cluster stuff was doing, so
add them to mainline in case we need to profile this stuff again.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 6c7887a7770c..efe20032e4a1 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -2346,6 +2346,8 @@ again:
                                  &entry->offset_index, 1);
         BUG_ON(ret);
 
+        trace_btrfs_setup_cluster(block_group, cluster,
+                                  total_found * block_group->sectorsize, 1);
         return 0;
 }
 
@@ -2368,6 +2370,7 @@ setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group,
         u64 window_start;
         u64 window_free;
         u64 max_extent;
+        u64 total_size = 0;
 
         entry = tree_search_offset(ctl, offset, 0, 1);
         if (!entry)
@@ -2433,11 +2436,12 @@ setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group,
                 rb_erase(&entry->offset_index, &ctl->free_space_offset);
                 ret = tree_insert_offset(&cluster->root, entry->offset,
                                          &entry->offset_index, 0);
+                total_size += entry->bytes;
                 BUG_ON(ret);
         } while (node && entry != last);
 
         cluster->max_size = max_extent;
-
+        trace_btrfs_setup_cluster(block_group, cluster, total_size, 0);
         return 0;
 }
 
@@ -2542,6 +2546,10 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
                 goto out;
         }
 
+        trace_btrfs_find_cluster(block_group, offset, bytes, empty_size,
+                                 min_bytes);
+
+        INIT_LIST_HEAD(&bitmaps);
         ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset,
                                       bytes + empty_size,
                                       cont1_bytes, min_bytes);
@@ -2559,6 +2567,8 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
                 list_add_tail(&cluster->block_group_list,
                               &block_group->cluster_list);
                 cluster->block_group = block_group;
+        } else {
+                trace_btrfs_failed_cluster_setup(block_group);
         }
 out:
         spin_unlock(&cluster->lock);