[kernel][vm] Syscall to query modified state

Add zx_pager_query_vmo_stats() that can be used to query pager-related
stats on a VMO. Currently only returns whether the VMO was modified
since the last zx_pager_query_vmo_stats() call.

Test: core-pager-writeback
Bug: 63989
Run-All-Tests: true
Change-Id: I461be1764690092c271a0c710fee0102110368b1
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/688663
Reviewed-by: Carlos Pizano <cpu@google.com>
Reviewed-by: Adrian Danis <adanis@google.com>
Commit-Queue: Rasha Eqbal <rashaeqbal@google.com>
API-Review: Carlos Pizano <cpu@google.com>
19 files changed
tree: 39652f7d0065b24f0a191dff37ef8702ad3aedc6
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. products/
  7. scripts/
  8. sdk/
  9. src/
  10. third_party/
  11. tools/
  12. zircon/
  13. .clang-format
  14. .clang-tidy
  15. .editorconfig
  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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