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From: Shawn Guo <shawn.guo@linaro.org>
To: "Marc Zyngier" <maz@kernel.org>,
	"Pierre-Clément Tosi" <ptosi@google.com>,
	"Ying-Chun Liu" <paul.liu@linaro.org>
Cc: Alexander Graf <agraf@csgraf.de>, Tom Rini <trini@konsulko.com>,
	u-boot@lists.denx.de
Subject: Regression caused by "arm64: Reduce PT size estimation complexity"
Date: Fri, 24 Oct 2025 12:15:24 +0800	[thread overview]
Message-ID: <aPr9XCyh62ULrY7U@dragon> (raw)

Hi folks,

While commit 94d30f476fe1 ("arm64: Reduce PT size estimation complexity")
speeds up the PT size calculation, it seems the result size becomes
unnecessarily bigger than before.  For example, on my device, the
original count_required_pts() returns 6 for get_page_table_size(),
while count_ranges() returns 14 now.  That said, the PT size returned by
get_page_table_size() eventually becomes 64 KiB bigger than before.
This is too much for my device which sets up PT on SRAM, and causing
a regression here.

Could you guys take a look and see whether we can get PT size
calculation speedy *and* compact? :)

Thanks,
Shawn

                 reply	other threads:[~2025-10-24  4:15 UTC|newest]

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