[PATCH 1/2] arm64: Reduce add_map() complexity

Tom Rini trini at konsulko.com
Tue Mar 7 18:52:31 CET 2023

On Tue, Feb 14, 2023 at 09:38:13PM +0800, Ying-Chun Liu (PaulLiu) wrote:

> From: Marc Zyngier <maz at kernel.org>
> In the add_map() function, for each level it populates, it iterates from
> the root of the PT tree, making it ineficient if a mapping needs to occur
> past level 1.
> Instead, replace it with a recursive (and much simpler) algorithm
> that keeps the complexity as low as possible. With this, mapping
> 512GB at level 2 goes from several seconds down to not measurable
> on an A55 machine.
> We keep the block mappings at level 1 for now though.
> Signed-off-by: Marc Zyngier <maz at kernel.org>
> Signed-off-by: Pierre-Clément Tosi <ptosi at google.com>
> [ Paul: pick from the Android tree. Fixup Pierre's commit. Rebase to the
>   upstream ]
> Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu at linaro.org>
> Cc: Tom Rini <trini at konsulko.com>
> Link: https://android.googlesource.com/platform/external/u-boot/+/96ad729cf4cab53bdff8222bb3eb256f38b5c3a6
> Link: https://android.googlesource.com/platform/external/u-boot/+/6be9330601d81545c7c941e3609f35bf68a09059

Applied to u-boot/next, thanks!

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