linux-kernel - Re: [PATCH 0/2] blk-throttle: Couple of cleanup and fixes for limit update code

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Message-ID: <4D753C79.4020800@fusionio.com>
Date:	Mon, 7 Mar 2011 21:13:45 +0100
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	"oleg@...hat.com" <oleg@...hat.com>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] blk-throttle: Couple of cleanup and fixes for limit
  update code

On 2011-03-07 16:50, Vivek Goyal wrote:
> On Mon, Feb 21, 2011 at 06:42:48PM -0500, Vivek Goyal wrote:
>> Hi Jens,
>>
>> Couple of throttle fixes seem to have fallen through cracks.
>>
>> https://lkml.org/lkml/2010/12/15/331
>>
>> I am reposting it for inclusion. Please let me know if you have any concerns.
>> Oleg and Paul acked the patch in the past so I am retaining their Reviewed-by:
>> lines.
>>
> 
> Hi Jens,
> 
> Can you please apply following patches for 2.6.39. These are good for fixing
> couple of race conditions in block throttle code w.r.t limit updates.
> Please let me know if you have concernes with these patches.

I have applied them now. 2/2 is a nice cleanup. But it does not apply
cleanly after the workqueue change we merged last week. I fixed it up
for you, manually applied hunk #5 and added the below diff. Please
inspect the end result. You should have rebased that patch.

Also note that you seem to have a double xchg() in there, also added
from 2/2.

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 7a833c9..32dd3e4 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -898,7 +898,7 @@ static void throtl_update_blkio_group_common(struct throtl_data *td,
 	xchg(&tg->limits_changed, true);
 	xchg(&td->limits_changed, true);
 	/* Schedule a work now to process the limit change */
-	throtl_schedule_delayed_work(td->queue, 0);
+	throtl_schedule_delayed_work(td, 0);
 }
 
 /*

-- 
Jens Axboe

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