Re: O_DIRECT question

[Phillip Susi]

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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