Btrfs: add tracepoints for flush events
We want to track when we're triggering flushing from our reservation code and
what flushing is being done when we start flushing. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 2e04c9d..83a6a93 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2626,6 +2626,15 @@
BTRFS_RESERVE_FLUSH_ALL,
};
+enum btrfs_flush_state {
+ FLUSH_DELAYED_ITEMS_NR = 1,
+ FLUSH_DELAYED_ITEMS = 2,
+ FLUSH_DELALLOC = 3,
+ FLUSH_DELALLOC_WAIT = 4,
+ ALLOC_CHUNK = 5,
+ COMMIT_TRANS = 6,
+};
+
int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len);
int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes);
void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 5d24ec44..31ded6a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4835,15 +4835,6 @@
return btrfs_commit_transaction(trans, root);
}
-enum flush_state {
- FLUSH_DELAYED_ITEMS_NR = 1,
- FLUSH_DELAYED_ITEMS = 2,
- FLUSH_DELALLOC = 3,
- FLUSH_DELALLOC_WAIT = 4,
- ALLOC_CHUNK = 5,
- COMMIT_TRANS = 6,
-};
-
struct reserve_ticket {
u64 bytes;
int error;
@@ -4901,6 +4892,8 @@
break;
}
+ trace_btrfs_flush_space(root->fs_info, space_info->flags, num_bytes,
+ orig_bytes, state, ret);
return ret;
}
@@ -5178,6 +5171,10 @@
list_add_tail(&ticket.list, &space_info->tickets);
if (!space_info->flush) {
space_info->flush = 1;
+ trace_btrfs_trigger_flush(root->fs_info,
+ space_info->flags,
+ orig_bytes, flush,
+ "enospc");
queue_work(system_unbound_wq,
&root->fs_info->async_reclaim_work);
}
@@ -5194,9 +5191,14 @@
*/
if (!root->fs_info->log_root_recovering &&
need_do_async_reclaim(space_info, root->fs_info, used) &&
- !work_busy(&root->fs_info->async_reclaim_work))
+ !work_busy(&root->fs_info->async_reclaim_work)) {
+ trace_btrfs_trigger_flush(root->fs_info,
+ space_info->flags,
+ orig_bytes, flush,
+ "preempt");
queue_work(system_unbound_wq,
&root->fs_info->async_reclaim_work);
+ }
}
spin_unlock(&space_info->lock);
if (!ret || flush == BTRFS_RESERVE_NO_FLUSH)