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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