Re: Possible Idea with filesystem buffering.

Rik van Riel
2002-01-20T21:32:41Z

On Mon, 21 Jan 2002, Hans Reiser wrote:
> Mark Hahn wrote:
> >On Sun, 20 Jan 2002, Hans Reiser wrote:
> >
> >>Write clustering is one thing it achieves. When we flush a slum, the
> >
> >sure, that's fine. when the VM tells you to write a page,
> >you're free to write *more*, but you certainly must give back
> >that particular page. afaicr, this was the conclusion
> >of the long-ago thread that you're referring to.
>
> This is bad for use with internal nodes. It simplifies version 4 a
> bunch to assume that if a node is in cache, its parent is also. Not
> sure what to do about it, maybe we need to copy the node. Surely we
> don't want to copy it unless it is a DMA related page cleaning.

DMA isn't a special case, this thing can happen with ANY
memory zone.

Unless of course you decide to make reiserfs unsupported
for NUMA machines...

regards,

Rik
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