Re: [LSF/MM/BPF TOPIC] Cloud storage optimizations

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On Thu, Mar 02, 2023 at 09:54:59PM -0500, Martin K. Petersen wrote:
> > For example, most cloud storage devices are doing read-ahead to try to
> > anticipate read requests from the VM.  This can interfere with the
> > read-ahead being done by the guest kernel.  So being able to tell
> > cloud storage device whether a particular read request is stemming
> > from a read-ahead or not.
> 
> Indeed. In our experience the hints that work best are the ones which
> convey to the storage device why the I/O is being performed.

This may be a pretty far-out-there idea, but I think SSD BPF injection has
potentially higher payoff than mere hints. The below paper does it in kernel,
but imagine doing it on the device!

  https://dl.acm.org/doi/pdf/10.1145/3458336.3465290



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