linux-kernel - Re: [PATCH 07/12] writeback: remove unused nonblocking and congestion checks (xfs)

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Date:	Thu, 19 Nov 2009 16:05:22 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/12] writeback: remove unused nonblocking and
	congestion checks (xfs)

On Thu, Nov 19, 2009 at 05:27:55AM +0800, Dave Chinner wrote:
> On Wed, Nov 18, 2009 at 04:26:55PM +0800, Wu Fengguang wrote:
> > No one is calling wb_writeback and write_cache_pages with
> > wbc.nonblocking=1 any more. And lumpy pageout will want to do
> > nonblocking writeback without the congestion wait.
> 
> ....
> 
> > --- linux.orig/fs/xfs/linux-2.6/xfs_aops.c	2009-11-06 09:22:35.000000000 +0800
> > +++ linux/fs/xfs/linux-2.6/xfs_aops.c	2009-11-06 09:52:21.000000000 +0800
> > @@ -908,12 +908,8 @@ xfs_convert_page(
> >  
> >  			bdi = inode->i_mapping->backing_dev_info;
> >  			wbc->nr_to_write--;
> > -			if (bdi_write_congested(bdi)) {
> > -				wbc->encountered_congestion = 1;
> 
> bdi is unused now, so can be removed as well. Otherwise looks fine.

Thanks, here is the updated patch.

---
writeback: remove unused nonblocking and congestion checks (xfs)

No one is calling wb_writeback and write_cache_pages with
wbc.nonblocking=1 any more. And lumpy pageout will want to do
nonblocking writeback without the congestion wait.

CC: Dave Chinner <david@...morbit.com> 
CC: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
---
 fs/xfs/linux-2.6/xfs_aops.c |    9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

--- linux.orig/fs/xfs/linux-2.6/xfs_aops.c	2009-11-19 16:00:51.000000000 +0800
+++ linux/fs/xfs/linux-2.6/xfs_aops.c	2009-11-19 16:04:33.000000000 +0800
@@ -904,16 +904,9 @@ xfs_convert_page(
 
 	if (startio) {
 		if (count) {
-			struct backing_dev_info *bdi;
-
-			bdi = inode->i_mapping->backing_dev_info;
 			wbc->nr_to_write--;
-			if (bdi_write_congested(bdi)) {
-				wbc->encountered_congestion = 1;
-				done = 1;
-			} else if (wbc->nr_to_write <= 0) {
+			if (wbc->nr_to_write <= 0)
 				done = 1;
-			}
 		}
 		xfs_start_page_writeback(page, !page_dirty, count);
 	}
--
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