For 2.3 I should have a generic facility for having writeable pages
in the page cache. This nearly eliminates the need for a buffer
cache, though it isn't on my immediate hit list. I'm putting the
finishing touches on a pgflush kernel daemon now.
With a LVM and similiar you also need to much around with where
filesystems get their blocks from, and the caching thereof.
Depending on how a LVM is implemented it might be worthwhile to
coordinate our efforts.
Eric
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