On 08/27/2010 06:36 AM, 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> CC: 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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