linux-kernel - Re: [GIT PULL] a few writeback fixes

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Message-ID: <20090921131138.GE1099@duck.suse.cz>
Date:	Mon, 21 Sep 2009 15:11:38 +0200
From:	Jan Kara <jack@...e.cz>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>, jack@...e.cz,
	fengguang.wu@...el.com
Subject: Re: [GIT PULL] a few writeback fixes

On Mon 21-09-09 14:56:20, Jens Axboe wrote:
  Hi Jens,

> Jan, since we're not really sure on the inode wait yet, I dropped that
> patch. It's definitely something to look into, as are the congestion
> bits.
  OK.

								Honza

> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 1eea4fa..6bb510b 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -485,6 +485,7 @@ static void balance_dirty_pages(struct address_space *mapping)
>  	unsigned long bdi_thresh;
>  	unsigned long pages_written = 0;
>  	unsigned long write_chunk = sync_writeback_pages();
> +	unsigned long pause = 1;
>  
>  	struct backing_dev_info *bdi = mapping->backing_dev_info;
>  
> @@ -561,7 +562,15 @@ static void balance_dirty_pages(struct address_space *mapping)
>  		if (pages_written >= write_chunk)
>  			break;		/* We've done our duty */
>  
> -		schedule_timeout(1);
> +		schedule_timeout_interruptible(pause);
> +
> +		/*
> +		 * Increase the delay for each loop, up to our previous
> +		 * default of taking a 100ms nap.
> +		 */
> +		pause <<= 1;
> +		if (pause < HZ / 10)
> +			pause = HZ / 10;
  Isn't this check the other way around?

>  	}
>  
>  	if (bdi_nr_reclaimable + bdi_nr_writeback < bdi_thresh &&

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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