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SubjectRe: O_DIRECT question
Denis Vlasenko wrote:
> What will happen if we just make open ignore O_DIRECT? ;)
>
> And then anyone who feels sad about is advised to do it
> like described here:
>
> http://lkml.org/lkml/2002/5/11/58

Then database and other high performance IO users will be broken. Most
of Linus's rant there is being rehashed now in this thread, and it has
been pointed out that using mmap instead is unacceptable because it is
inherently _synchronous_ and the app can not tolerate the page faults on
read, and handling IO errors during the page fault is impossible/highly
problematic.


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