From: Dave Chinner Date: Thu, 4 Mar 2010 01:46:23 +0000 (+0000) Subject: xfs: check for more work before sleeping in xfssyncd X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=20f6b2c785cf187445f126321638ab8ba7aa7494;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git xfs: check for more work before sleeping in xfssyncd xfssyncd processes a queue of work by detaching the queue and then iterating over all the work items. It then sleeps for a time period or until new work comes in. If new work is queued while xfssyncd is actively processing the detached work queue, it will not process that new work until after a sleep timeout or the next work event queued wakes it. Fix this by checking the work queue again before going to sleep. Signed-off-by: Dave Chinner Signed-off-by: Christoph Hellwig Signed-off-by: Alex Elder --- diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c index f9fc154d9f72..05cd85317f6f 100644 --- a/fs/xfs/linux-2.6/xfs_sync.c +++ b/fs/xfs/linux-2.6/xfs_sync.c @@ -607,7 +607,8 @@ xfssyncd( set_freezable(); timeleft = xfs_syncd_centisecs * msecs_to_jiffies(10); for (;;) { - timeleft = schedule_timeout_interruptible(timeleft); + if (list_empty(&mp->m_sync_list)) + timeleft = schedule_timeout_interruptible(timeleft); /* swsusp */ try_to_freeze(); if (kthread_should_stop() && list_empty(&mp->m_sync_list)) @@ -627,8 +628,7 @@ xfssyncd( list_add_tail(&mp->m_sync_work.w_list, &mp->m_sync_list); } - list_for_each_entry_safe(work, n, &mp->m_sync_list, w_list) - list_move(&work->w_list, &tmp); + list_splice_init(&mp->m_sync_list, &tmp); spin_unlock(&mp->m_sync_lock); list_for_each_entry_safe(work, n, &tmp, w_list) {