[kernel][vm] Pager ops for writeback begin and end

Add pager ops ZX_PAGER_OP_WRITEBACK_BEGIN and ZX_PAGER_OP_WRITEBACK_END,
which can be used in combination to clean pages that have been dirtied.

Test: core-pager-writeback-test

Bug: 63989
Change-Id: Id6ddce35772da69a6e287d7ef6fd0a78423938a1
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/613640
Reviewed-by: Adrian Danis <adanis@google.com>
Reviewed-by: Carlos Pizano <cpu@google.com>
API-Review: Carlos Pizano <cpu@google.com>
Commit-Queue: Rasha Eqbal <rashaeqbal@google.com>
12 files changed
tree: 78ad4c3868762c8f2f117cf5c2d4e1af6852b3ab
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gn
  20. .style.yapf
  21. analysis_options.yaml
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. pyrightconfig.json
  30. README.md
  31. rustfmt.toml
README.md

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