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SubjectRe: [PATCH][5/?] count writeback pages in nr_scanned
Nick Piggin <nickpiggin@yahoo.com.au> wrote:
>
> > If the queue is not congested, blk_congestion_wait() will still sleep. See
> > freed_request().
> >
>
> Hmm... doesn't look like it to me:
>
> if (rl->count[rw] < queue_congestion_off_threshold(q))
> clear_queue_congested(q, rw);
>
> And clear_queue_congested does an unconditional wakeup (if there
> is someone sleeping on the congestion queue).

That's my point. blk_congestion_wait() will always sleep, regardless of
the queue's congestion state.
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