runtime: define maximum supported physical page and huge page sizes

This change defines a maximum supported physical and huge page size in
the runtime based on the new page allocator's implementation, and uses
them where appropriate.

Furthemore, if the system exceeds the maximum supported huge page
size, we simply ignore it silently.

It also fixes a huge-page-related test which is only triggered by a
condition which is definitely wrong.

Finally, it adds a few TODOs related to code clean-up and supporting
larger huge page sizes.

Updates #35112.
Fixes #35431.

Change-Id: Ie4348afb6bf047cce2c1433576d1514720d8230f
Reviewed-on: https://go-review.googlesource.com/c/go/+/205937
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
4 files changed
tree: 8747c932e6126d4cef0556e6969cc7daf9ef908e
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. SECURITY.md
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