[all-commits] [llvm/llvm-project] 98c21a: [sanitizer][fuchsia] Implement ReleaseMemoryPagesToOS

[Marco Vanotti via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 98c21ae7a8ec587febc899753b63054ae9aea9d6
      https://github.com/llvm/llvm-project/commit/98c21ae7a8ec587febc899753b63054ae9aea9d6
  Author: Marco Vanotti <mvanotti at google.com>
  Date:   2021-01-27 (Wed, 27 Jan 2021)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp

  Log Message:
  -----------
  [sanitizer][fuchsia] Implement ReleaseMemoryPagesToOS

The `zx_vmar_op_range` allows us to decommit memory pages without
needing a handle to the underlying vmo, as long as we have a handle to
a vmar that contains this mapping. This allows us to implement the
`ReleaseMemoryPagesToOS` function by decommitting the memory using a
handle to the root vmar.

Reviewed By: mcgrathr

Differential Revision: https://reviews.llvm.org/D95384