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

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Date:	Thu, 19 Nov 2009 08:27:55 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	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 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.

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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