linux-kernel - Re: [GIT PULL] Core block IO bits for 2.6.39

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Date:	Thu, 24 Mar 2011 22:01:08 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [GIT PULL] Core block IO bits for 2.6.39 - early Oops

On 2011-03-24 21:06, Markus Trippelsdorf wrote:
> On 2011.03.24 at 20:57 +0100, Jens Axboe wrote:
>>
>> OK, still a data point. What was the last -git kernel you used?
> 
> This one was the last and gave me no problems:
> 
> commit b81a618dcd3ea99de292dbe624f41ca68f464376
> Merge: 2f284c8 a9712bc
> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> Date:   Wed Mar 23 20:51:42 2011 -0700
> 
>     Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

Puzzling... Poking at straws here so far. Does this make any difference
whatsoever?

diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index c05324d..580966f 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -989,8 +989,6 @@ xfs_buf_lock(
 
 	if (atomic_read(&bp->b_pin_count) && (bp->b_flags & XBF_STALE))
 		xfs_log_force(bp->b_target->bt_mount, 0);
-	if (atomic_read(&bp->b_io_remaining))
-		blk_flush_plug(current);
 	down(&bp->b_sema);
 	XB_SET_OWNER(bp);
 
@@ -1439,8 +1437,6 @@ xfs_buf_iowait(
 {
 	trace_xfs_buf_iowait(bp, _RET_IP_);
 
-	if (atomic_read(&bp->b_io_remaining))
-		blk_flush_plug(current);
 	wait_for_completion(&bp->b_iowait);
 
 	trace_xfs_buf_iowait_done(bp, _RET_IP_);
@@ -1943,9 +1939,6 @@ xfsbufd(
 			xfs_bdstrat_cb(bp);
 			count++;
 		}
-		if (count)
-			blk_flush_plug(current);
-
 	} while (!kthread_should_stop());
 
 	return 0;
@@ -1992,7 +1985,6 @@ xfs_flush_buftarg(
 
 	if (wait) {
 		/* Expedite and wait for IO to complete. */
-		blk_flush_plug(current);
 		while (!list_empty(&wait_list)) {
 			bp = list_first_entry(&wait_list, struct xfs_buf, b_list);
 

-- 
Jens Axboe

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