Re: Unexpected splice "always copy" behavior observed

From: Linus Torvalds
Date: Wed May 19 2010 - 12:04:58 EST

On Wed, 19 May 2010, Miklos Szeredi wrote:
> And predictability is good. The thing I don't like about the above is
> that it makes it totally unpredictable which pages will get moved, if
> any.


Think of it this way: it is predictable. They get predictably moved when
moving is cheap and easy. It's about _performance_.

Do you know when TLB misses happen? They are unpredictable. Do you know
when the OS sends IPI's around? Do you know when scheduling happens?

No you don't. So stop whining.

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