Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait

From: Jens Axboe (
Date: Tue Feb 06 2001 - 14:35:25 EST

On Tue, Feb 06 2001, Ben LaHaise wrote:
> > > As for io completion, can't we just issue seperate requests for the
> > > critical data and the readahead? That way for SCSI disks, the important
> > > io should be finished while the readahead can continue. Thoughts?
> >
> > Priorities?
> Definately. I'd like to be able to issue readaheads with a "don't bother
> executing if this request unless the cost is low" bit set. It might also
> be helpful for heavy multiuser loads (or even a single user with multiple
> processes) to ensure progress is made for others.

And in other contexts too it might be handy to assign priorities to
requests as well. I don't know how sgi plan on handling grio (or already
handle it in irix), maybe Steve can fill us in on that :)

Jens Axboe

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