Re: [PATCH V3][for-next] mm: add a new vector based madvise syscall

On Tue, Dec 08, 2015 at 07:18:08AM +0100, Andi Kleen wrote:

quoted

+	if (behavior != MADV_DONTNEED && behavior != MADV_FREE)
+		return -EINVAL;

This limitations is kind of lame and makes it a special purpose hack.

It will also cause backwards compatibility issues if it needs
to be extended later.

How hard would it be to support all of madvise vectored?

That would also give much cleaner documentation.

Ok, I'll add other behavior. Reducing syscall and mmap_sem locking is a
win for other madvise.

Thanks,
Shaohua

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