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SubjectRe: Special Kernel Modification
Hi Jeff,

Jeff Dike <> writes:

> Ummm, how about O_DIRECT instead of O_SYNC (or maybe as well, my googling
> hasn't been clear on whether O_DIRECT bypasses the cache on writes as well)?

It does, but it has been deimplemented in the Linus tree and never put into
the -ac tree. You would need -aa for working O_DIRECT or use a raw device.

Also they both have some restrictions on buffer alignment, but these would be
already fulfilled if UML internally writes through the page cache (which
it does of course)

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