Messages in this thread |  | | | Date | Wed, 10 Jan 2007 19:05:30 -0800 (PST) | | From | Linus Torvalds <> | | Subject | Re: O_DIRECT question |
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On Thu, 11 Jan 2007, Aubrey wrote: > > Now, my question is, is there a existing way to mount a filesystem > with O_DIRECT flag? so that I don't need to change anything in my > system. If there is no option so far, What is the right way to achieve > my purpose?
The right way to do it is to just not use O_DIRECT.
The whole notion of "direct IO" is totally braindamaged. Just say no.
This is your brain: O This is your brain on O_DIRECT: .
Any questions?
I should have fought back harder. There really is no valid reason for EVER using O_DIRECT. You need a buffer whatever IO you do, and it might as well be the page cache. There are better ways to control the page cache than play games and think that a page cache isn't necessary.
So don't use O_DIRECT. Use things like madvise() and posix_fadvise() instead.
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