From 8375f922aaa6e7a880022529202fb486315568c3 Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Thu, 28 Jun 2012 06:52:56 -0400 Subject: xfs: re-enable xfsaild idle mode and fix associated races xfsaild idle mode logic currently leads to a couple hangs: 1.) If xfsaild is rescheduled in during an incremental scan (i.e., tout != 0) and the target has been updated since the previous run, we can hit the new target and go into idle mode with a still populated ail. 2.) A wake up is only issued when the target is pushed forward. The wake up can race with xfsaild if it is currently in the process of entering idle mode, causing future wake up events to be lost. These hangs have been reproduced and verified as fixed by running xfstests 273 in a loop on a slightly modified upstream kernel. The kernel is modified to re-enable idle mode as previously implemented (when count == 0) and with a revert of commit 670ce93f, which includes performance improvements that make this harder to reproduce. The solution, the algorithm for which has been outlined by Dave Chinner, is to modify xfsaild to enter idle mode only when the ail is empty and the push target has not been moved forward since the last push. Signed-off-by: Brian Foster Reviewed-by: Dave Chinner Reviewed-by: Christoph Hellwig Signed-off-by: Ben Myers --- fs/xfs/xfs_trans_priv.h | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/xfs/xfs_trans_priv.h') diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h index fb62377d1cbc..53b7c9b0f8f7 100644 --- a/fs/xfs/xfs_trans_priv.h +++ b/fs/xfs/xfs_trans_priv.h @@ -67,6 +67,7 @@ struct xfs_ail { struct task_struct *xa_task; struct list_head xa_ail; xfs_lsn_t xa_target; + xfs_lsn_t xa_target_prev; struct list_head xa_cursors; spinlock_t xa_lock; xfs_lsn_t xa_last_pushed_lsn; -- cgit