On Wed, 30 Aug 2000, Jens Axboe wrote:
>
> Maybe I wasn't very clear... What I mean is that drivers that use
> blk_queue_make_request (such as md) are handed buffers directly and
> don't get requests added to their queues in the regular sense, instead
> they remap b_rdev before ll_rw_blk gets the queue for the device and
> adds them to the destination queue.
Ho humm.. I actually kind of expected the statistics to be done in
generic_make_request(), so that we'd have
.....
do {
q = blk_get_queue(bh->b_rdev);
if (!q) {
... no such device ..
}
+ statistics(q, rw, bh->b_size);
} while (q->make_request_fn(q, rw, bh)));
...
and just remove the drive_stat_acct() thing completely.
That way, we'd have a per-queue "this many reads, this many writes".
The /proc code would have to find all the queues, but that shouldn't be
too bad either. At least we wouldn't have the current silly disk_index()
stuff (which is all done in a timing-critical routine).
Then, as we get saner and saner queues, we'll get saner and saner
statistics automatically. The above should already be quite sane for IDE.
No?
Linus
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