From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Date: Tue, 24 Jun 2014 15:00:44 +0000 (+0900)
Subject: btrfs compression: reuse recently used workspace
X-Git-Tag: v4.14-rc1~7203^2~15
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c39aa7056f50fa7b49265ea35c0f3eddb7c7be68;p=platform%2Fkernel%2Flinux-rpi.git

btrfs compression: reuse recently used workspace

Add compression `workspace' in free_workspace() to
`idle_workspace' list head, instead of tail. So we have
better chances to reuse most recently used `workspace'.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 92371c4..1daea0b 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -821,7 +821,7 @@ static void free_workspace(int type, struct list_head *workspace)
 
 	spin_lock(workspace_lock);
 	if (*num_workspace < num_online_cpus()) {
-		list_add_tail(workspace, idle_workspace);
+		list_add(workspace, idle_workspace);
 		(*num_workspace)++;
 		spin_unlock(workspace_lock);
 		goto wake;