Merge branch 'for-rmk' of git://git.marvell.com/orion

[linux-2.6-omap-h63xx.git] / fs / jffs2 / background.c

diff --git a/fs/jffs2/background.c b/fs/jffs2/background.c
index 3cceef4ad2b7df413e98b8171cadf074de83ad2d..e9580104b6ba477894b60c6bb3e69839c5677d2f 100644 (file)
--- a/fs/jffs2/background.c
+++ b/fs/jffs2/background.c
@@ -95,13 +95,17 @@ static int jffs2_garbage_collect_thread(void *_c)
                        spin_unlock(&c->erase_completion_lock);
                        
 
-               /* This thread is purely an optimisation. But if it runs when
-                  other things could be running, it actually makes things a
-                  lot worse. Use yield() and put it at the back of the runqueue
-                  every time. Especially during boot, pulling an inode in
-                  with read_inode() is much preferable to having the GC thread
-                  get there first. */
-               yield();
+               /* Problem - immediately after bootup, the GCD spends a lot
+                * of time in places like jffs2_kill_fragtree(); so much so
+                * that userspace processes (like gdm and X) are starved
+                * despite plenty of cond_resched()s and renicing.  Yield()
+                * doesn't help, either (presumably because userspace and GCD
+                * are generally competing for a higher latency resource -
+                * disk).
+                * This forces the GCD to slow the hell down.   Pulling an
+                * inode in with read_inode() is much preferable to having
+                * the GC thread get there first. */
+               schedule_timeout_interruptible(msecs_to_jiffies(50));
 
                /* Put_super will send a SIGKILL and then wait on the sem.
                 */