Re: [PATCH] add a clear_pages function to clear pages of higherorder

[David S. Miller]

On 27 Mar 2005 19:12:20 +0200
Andi Kleen <ak@xxxxxx> wrote:

> With non temporal stores
> you guarantee at least one hard cache miss directly after
> the return to user space.

This is true if the cacheline were not present already at
the time of the non-temporal store.

I know what you're trying to say, I'm just clarifying.

The real question is if a large enough ratio of those
cachelines in the page get similarly accessed.  I happen
to think the answer to that for any real example is yes.
Yet, I have no way to prove this.

It would be cool to do some hacks under Xen or user-mode
Linux to get some real statistics about this.  Actually,
this could be done also with hacks to valgrind or other
similar tools.  QEMU could also be used.
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