Re: [1/1] Block device throttling [Re: Distributed storage.]

On Friday 31 August 2007 14:41, Alasdair G Kergon wrote:

On Thu, Aug 30, 2007 at 04:20:35PM -0700, Daniel Phillips wrote:

quoted

Resubmitting a bio or submitting a dependent bio from
inside a block driver does not need to be throttled because all
resources required to guarantee completion must have been obtained
_before_ the bio was allowed to proceed into the block layer.

I'm toying with the idea of keeping track of the maximum device stack
depth for each stacked device, and only permitting it to increase in
controlled circumstances.

Hi Alasdair,

What kind of circumstances did you have in mind?

Regards,

Daniel