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

[Andrea Arcangeli]

On Thu, Jan 06, 2005 at 04:19:36PM +1100, Nick Piggin wrote:
> This is practically what blk_congestion_wait does when the queue
> isn't congested though, isn't it?

The fundamental difference that makes it reliable is that:

1) only the I/O we're throttling against will be considered for the
   wakeup event, which means only clearing PG_writeback will be
   considered eligible for wakeup
   Currently _all_ unrelated write I/O was considered eligible
   for wakeup events and that could cause spurious oom kills.
2) we won't need unreliable anti-deadlock timeouts anymore
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