Re: [PATCH 02/11] libata-eh: implement ata_ering

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

On Llu, 2006-05-15 at 23:25 +0900, Tejun Heo wrote:
> I was too quick to response.  ering keeps track of timestamps of each
> error and the criteria for speeding down is something like "3 class 1
> errors during last 15mins", so bitmaps doesn't cut it.

Sounds like it does


	log_class_1_error(dev)
	{
		if((dev->class1 & 3) < 3) {
			dev->class1++;
			dev->class1sum++;
		} else {
			/* 3 this minute alone */
			it_happened_now_case();
		}
	}

	class_1_each_minute(dev)
	{
		dev->class1sum -= (dev->class1 >> 30);
		dev->class1 <<= 2;
	}