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SubjectRe: O_DIRECT question
Denis Vlasenko wrote:
> I still don't see much difference between O_SYNC and O_DIRECT write
> semantic.

Yes, if you change the normal io paths to properly support playing
vmsplice games ( which have a number of corner cases ) to get the zero
copy, and support madvise() and O_SYNC to control caching behavior, and
fix all the error handling corner cases, then you may be able to do away
with O_DIRECT.

I believe that doing all that will be much more complex than O_DIRECT
however.

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