quoted

writeback: remove the internal 5% low bound on dirty_ratio

The dirty_ratio was silently 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.  I think it is
an aesthetic improvement as well as a functional one.

Reviewed-by: NeilBrown <redacted>

I agree :)
	Reviewed-by: KOSAKI Motohiro [off-list ref]




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