> Yeah, I'm guestimating O on a per device basis, but I agree that the
> current ratio limiting is quite crude. I'm not at all sorry to see
> throttle_vm_writeback() go, I just wanted to make a point that what it
> does is not quite without merrit - we agree that it can be done better
> differently.
Yes. So what is it to be?
Is limiting by device queues enough?
Or do we need some global limit?
If so, the cleanest way I see is to separately account and limit
swap-writeback pages, so the global counters don't interfere with the
limiting.
This shouldn't be hard to do, as we have the per-bdi writeback
counting infrastructure already, and also a pseudo bdi for swap in
swapper_space.backing_dev_info.
Miklos
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