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@suse.cz>
CC: Rik van Riel<redacted>
CC: Peter Zijlstra<redacted>
Proposed-by: Con Kolivas[off-list ref]
Reviewed-by: Neil Brown<redacted>
Reviewed-by: KOSAKI Motohiro<redacted>
Signed-off-by: Wu Fengguang<redacted>

Reviewed-by: Rik van Riel <redacted>

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