Andrew Morton wrote:
Yes, if you agree with Jeff's original point.
But I don't, actually. Sure, on some machines+workloads, AIO is more
common than sync IO. But I expect that when we sum across all the
machines+workloads in the world, sync IO is more common and is hence the
case we should optimise for.
That's assuming that the unlikely() actually does something.
But as Jeff said, that's not what unlikely is for. It should only be
used when it is unlikely for everybody, all the time, because when it is
right, it helps rather little, but when it is wrong, it hurts a lot.
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