Re: [PATCH 3/8] writeback: switch to per-bdi threads for flushingdata v2

[Jens Axboe]

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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