[PATCH 13/14] Btrfs: don't bother kicking async if there's nothing to reclaim

From: Josef Bacik <jbacik@fb.com>
To: <linux-btrfs@vger.kernel.org>
Subject: [PATCH 13/14] Btrfs: don't bother kicking async if there's nothing to reclaim
Date: Fri, 25 Mar 2016 13:25:59 -0400	[thread overview]
Message-ID: <1458926760-17563-14-git-send-email-jbacik@fb.com> (raw)
In-Reply-To: <1458926760-17563-1-git-send-email-jbacik@fb.com>

We do this check when we start the async reclaimer thread, might as well check
before we kick it off to save us some cycles.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
---
 fs/btrfs/extent-tree.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 273e18d..4b5a517 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4871,6 +4871,9 @@ static inline int need_do_async_reclaim(struct btrfs_space_info *space_info,
 	if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh)
 		return 0;
 
+	if (!btrfs_calc_reclaim_metadata_size(fs_info->fs_root, space_info))
+		return 0;
+
 	return (used >= thresh && !btrfs_fs_closing(fs_info) &&
 		!test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state));
 }
-- 
2.5.0

