> Write clustering is one thing it achieves.
>
> Flushing everything involved in a transaction ... is another thing.
Agreed on these points, but you really HAVE TO work towards
flushing the page ->writepage() gets called for.
Think about your typical PC, with memory in ZONE_DMA,
ZONE_NORMAL and ZONE_HIGHMEM. If we are short on DMA pages
we will end up calling ->writepage() on a DMA page.
If the filesystem ends up writing completely unrelated pages
and marking the DMA page in question referenced the VM will
go in a loop until the filesystem finally gets around to
making a page in the (small) DMA zone freeable ...
regards,
Rik
--
"Linux holds advantages over the single-vendor commercial OS"
-- Microsoft's "Competing with Linux" document
http://www.surriel.com/ http://distro.conectiva.com/
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