On Sat, Aug 06, 2011 at 04:44:52PM +0800, Wu Fengguang wrote:
[..]
> - trace_balance_dirty_start(bdi);
> - if (bdi_nr_reclaimable > task_bdi_thresh) {
> - pages_written += writeback_inodes_wb(&bdi->wb,
> - write_chunk);
> - trace_balance_dirty_written(bdi, pages_written);
> - if (pages_written >= write_chunk)
> - break; /* We've done our duty */
> + if (unlikely(!writeback_in_progress(bdi)))
> + bdi_start_background_writeback(bdi);
> +
> + base_bw = bdi->dirty_ratelimit;
> + bw = bdi_position_ratio(bdi, dirty_thresh, nr_dirty,
> + bdi_thresh, bdi_dirty);
For the sake of consistency of usage of varibale naming how about using
pos_ratio = bdi_position_ratio()?
> + if (unlikely(bw == 0)) {
> + pause = MAX_PAUSE;
> + goto pause;
> }
> + bw = (u64)base_bw * bw >> BANDWIDTH_CALC_SHIFT;
So far bw had pos_ratio as value now it will be replaced with actual
bandwidth as value. It makes code confusing. So using pos_ratio will
help.
bw = (u64)base_bw * pos_ratio >> BANDWIDTH_CALC_SHIFT;
Thanks
Vivek
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