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

From: Jens Axboe (
Date: Tue Feb 06 2001 - 12:14:49 EST

On Tue, Feb 06 2001, Stephen C. Tweedie wrote:
> > I don't think os. If we minimize the state in the IO container object,
> > the lower levels could split them at their guess and the IO completion
> > function just has to handle the case that it might be called for a smaller
> > object.
> The whole point of the post was that it is merging, not splitting,
> which is troublesome. How are you going to merge requests without
> having chains of scatter-gather entities each with their own
> completion callbacks?

You can't, the stuff I played with turned out to be horrible. At
least with the current kiobuf I/O stuff, merging will have to be
done before its submitted. And IMO we don't want to loose the
ability to cluster buffers and requests in ll_rw_blk.

Jens Axboe

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