Re: [RFC] Notifier for Externally Mapped Memory (EMM)

[Christoph Lameter]

On Tue, 4 Mar 2008, Andrea Arcangeli wrote:

> When working with single pages it's more efficient and preferable to
> call invalidate_page and only later release the VM reference on the
> page.

But as you pointed out before that path is a slow path anyways. Its rarely 
taken. Having a single eviction callback simplifies design.

Plus the device driver can still check if the mapping was of PAGE_SIZE and 
then implement its own optimization.
 
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