Re: [PATCH][5/?] count writeback pages in nr_scanned

[Andrea Arcangeli]

On Thu, Jan 06, 2005 at 04:06:34PM +1100, Nick Piggin wrote:
> Yeah I guess that isn't a bad idea.
> 
> Doesn't that have the theoretical problem of slowing down reclaim
> of dirty pages backed by fast devices when you have slow devices
> writing?

Andrew just suggested to wait on any random page. That's a minor
modification to that logic. Effectively it's stupid to wait on a
specific random page, when we can wait wait on _any_ random page to
complete the writeback I/O.

With locking done right by setting the state to uninterruptible and
then registering in the new waitqueue when we know at least one page has
PG_writeback set, we can then drop the HZ anti-deadlock hacks too.
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