kill-the-bkl/reiserfs: use mutex_lock in reiserfs_mutex_lock_safe
authorFrederic Weisbecker <fweisbec@gmail.com>
Fri, 8 May 2009 18:01:09 +0000 (20:01 +0200)
committerFrederic Weisbecker <fweisbec@gmail.com>
Mon, 14 Sep 2009 05:18:21 +0000 (07:18 +0200)
reiserfs_mutex_lock_safe() is a hack to avoid any dependency between
an internal reiserfs mutex and the write lock, it has been proposed
to follow the old bkl logic.

The code does the following:

while (!mutex_trylock(m)) {
reiserfs_write_unlock(s);
schedule();
reiserfs_write_lock(s);
}

It then imitate the implicit behaviour of the lock when it was
a Bkl and hadn't such dependency:

mutex_lock(m) {
if (fastpath)
let's go
else {
wait_for_mutex() {
schedule() {
unlock_kernel()
reacquire_lock_kernel()
}
}
}
}

The problem is that by using such explicit schedule(), we don't
benefit of the adaptive mutex spinning on owner.

The logic in use now is:

reiserfs_write_unlock(s);
mutex_lock(m); // -> possible adaptive spinning
reiserfs_write_lock(s);

[ Impact: restore the use of adaptive spinning mutexes in reiserfs ]

Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
fs/reiserfs/journal.c

index ffb7f50abc2fe0a932c44685042edae4e0ba5ce2..e9a972bd0323fa99359f6da317d186ba66051cfc 100644 (file)
@@ -566,11 +566,9 @@ static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
 static inline void reiserfs_mutex_lock_safe(struct mutex *m,
                               struct super_block *s)
 {
-       while (!mutex_trylock(m)) {
-               reiserfs_write_unlock(s);
-               schedule();
-               reiserfs_write_lock(s);
-       }
+       reiserfs_write_unlock(s);
+       mutex_lock(m);
+       reiserfs_write_lock(s);
 }
 
 /* lock the current transaction */