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Re: [PATCH v6 7/7] mm: allow page scrubbing routine(s) to be arch controlled
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Tue, 24 Jun 2025 17:02:25 -0400
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 24 Jun 2025 21:02:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2025-06-16 09:02, Jan Beulich wrote:
Especially when dealing with large amounts of memory, memset() may not
be very efficient; this can be bad enough that even for debug builds a
custom function is warranted. We additionally want to distinguish "hot"
and "cold" cases (with, as initial heuristic, "hot" being for any
allocations a domain does for itself, assuming that in all other cases
the page wouldn't be accessed [again] soon). The goal is for accesses
of "cold" pages to not disturb caches (albeit finding a good balance
between this and the higher latency looks to be difficult).
Keep the default fallback to clear_page_*() in common code; this may
want to be revisited down the road.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Oleksii Kurochko<oleksii.kurochko@xxxxxxxxx>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
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