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 92371c41422861a4a38c287e67a63be0f00b3089..1daea0b47187b58db65dde86411e88578473fcf4 100644 (file)
--- 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;