From: Chris Mason <chris.mason@fusionio.com>
Date: Mon, 23 Jul 2012 19:23:45 +0000 (-0400)
Subject: Btrfs: don't wait around for new log writers on an SSD
X-Git-Tag: upstream/snapshot3+hdmi~6698^2~71
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e39e64ac0cdeca3798a6bf186f873be20e2f57b4;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

Btrfs: don't wait around for new log writers on an SSD

Waiting on spindles improves performance, but ssds want all the
IO as quickly as we can push it down.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index b72b068..8c35847 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -1330,7 +1330,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 		spin_unlock(&root->fs_info->trans_lock);
 	}
 
-	if (now < cur_trans->start_time || now - cur_trans->start_time < 1)
+	if (!btrfs_test_opt(root, SSD) &&
+	    (now < cur_trans->start_time || now - cur_trans->start_time < 1))
 		should_grow = 1;
 
 	do {