linux-kernel - Re: [PATCH 3/8] writeback: switch to per-bdi threads for flushing data v2

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Date:	Fri, 4 Sep 2009 14:06:12 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com, hch@...radead.org,
	tytso@....edu, akpm@...ux-foundation.org
Subject: Re: [PATCH 3/8] writeback: switch to per-bdi threads for flushing
	data v2

On Fri, Sep 04 2009, Jens Axboe wrote:
> +static long wb_check_old_data_flush(struct bdi_writeback *wb)
> +{
> +	unsigned long expired;
> +	long nr_pages;
> +
> +	expired = wb->last_old_flush +
> +			msecs_to_jiffies(dirty_writeback_interval * 10);
> +	if (time_before(jiffies, expired))
> +		return 0;
> +
> +	nr_pages = global_page_state(NR_FILE_DIRTY) +
> +			global_page_state(NR_UNSTABLE_NFS) +
> +			(inodes_stat.nr_inodes - inodes_stat.nr_unused);
> +
> +	return wb_writeback(wb, nr_pages, NULL, WB_SYNC_NONE, 1);
> +}

Needs to set ->last_old_flush of course. I also made it check for
nr_pages > 0 before calling into wb_writeback().

-- 
Jens Axboe

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