* Regression caused by "arm64: Reduce PT size estimation complexity"
@ 2025-10-24 4:15 Shawn Guo
0 siblings, 0 replies; only message in thread
From: Shawn Guo @ 2025-10-24 4:15 UTC (permalink / raw)
To: Marc Zyngier, Pierre-Clément Tosi, Ying-Chun Liu
Cc: Alexander Graf, Tom Rini, u-boot
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
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2025-10-24 4:15 Regression caused by "arm64: Reduce PT size estimation complexity" Shawn Guo
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