On Feb 25, 2021, at 12:52 AM, Nadav Amit [off-list ref] wrote:

quoted

On Feb 25, 2021, at 12:40 AM, Peter Zijlstra [off-list ref] wrote:

On Wed, Feb 24, 2021 at 11:29:04PM -0800, Nadav Amit wrote:

quoted

From: Nadav Amit <redacted>

Just as applications can use prefetch instructions to overlap
computations and memory accesses, applications may want to overlap the
page-faults and compute or overlap the I/O accesses that are required
for page-faults of different pages.

[
[ snip ]

quoted

Interesting, but given we've been removing explicit prefetch from some
parts of the kernel how useful is this in actual use? I'm thinking there
should at least be a real user and performance numbers with this before
merging.

Can you give me a reference to the “removing explicit prefetch from some
parts of the kernel”?

Oh. I get it - you mean we remove we remove the use of explicit memory
prefetch from the kernel code. Well, I don’t think it is really related,
but yes, performance numbers are needed.