Re: [PATCH] writeback: remove the internal 5% low bound ondirty_ratio

[Peter Zijlstra]

On Fri, 2010-08-27 at 18:36 +0800, Wu Fengguang wrote:
> The dirty_ratio was siliently limited in global_dirty_limits() to >= 5%.
> This is not a user expected behavior. And it's inconsistent with
> calc_period_shift(), which uses the plain vm_dirty_ratio value.
> 
> Let's rip the internal bound.
> 
> At the same time, fix balance_dirty_pages() to work with the
> dirty_thresh=0 case. This allows applications to proceed when
> dirty+writeback pages are all cleaned.
> 
> And ">" fits with the name "exceeded" better than ">=" does. Neil
> think it is an aesthetic improvement as well as a functional one :)
> 
> CC: Jan Kara <jack@xxxxxxx>
> CC: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> Proposed-by: Con Kolivas <kernel@xxxxxxxxxxx>
> Reviewed-by: Neil Brown <neilb@xxxxxxx>
> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>

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