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

[Andrew Morton]

Andrea Arcangeli <andrea@xxxxxxx> wrote:
>
> 2) we won't need unreliable anti-deadlock timeouts anymore

The timeouts are for:

a) A fallback for backing stores which don't wake up waiters in
   blk_congestion_wait() (eg: NFS).

b) handling the race case where the request queue suddenly goes empty
   before the sleeper gets onto the waitqueue.

It can probably be removed with some work, and additional locking.
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