btrfs: discard: speed up async discard up to iops_limit
Instead of using iops_limit only for cutting off extremes, calculate the discard delay directly from it, so it closely follows iops_limit and doesn't under-discard even though quotas are not saturated. The iops limit could be hit more often in some cases and could increase the discard rate. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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