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

[Ingo Molnar]

On Tue, 6 Feb 2001, Ben LaHaise wrote:

> > - higher levels do not have the kind of state to eg. merge requests done
> >   by different users. The only chance for merging is often the lowest
> >   level, where we already know what disk, which sector.
>
> That's what a readaround buffer is for, [...]

If you are merging based on (device, offset) values, then that's lowlevel
- and this is what we have been doing for years.

If you are merging based on (inode, offset), then it has flaws like not
being able to merge through a loopback or stacked filesystem.

        Ingo

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