[all-commits] [llvm/llvm-project] 00d990: [scudo][standalone] Enable secondary cache release...

[Kostya Kortchinsky via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 00d9907a7ac86c3aa49c8cbb21a97094b5887ea9
      https://github.com/llvm/llvm-project/commit/00d9907a7ac86c3aa49c8cbb21a97094b5887ea9
  Author: Kostya Kortchinsky <kostyak at google.com>
  Date:   2020-09-02 (Wed, 02 Sep 2020)

  Changed paths:
    M compiler-rt/lib/scudo/standalone/combined.h
    M compiler-rt/lib/scudo/standalone/secondary.h
    M compiler-rt/lib/scudo/standalone/tests/combined_test.cpp
    M compiler-rt/lib/scudo/standalone/tests/secondary_test.cpp

  Log Message:
  -----------
  [scudo][standalone] Enable secondary cache release on Fuchsia

I had left this as a TODO, but it turns out it wasn't complicated.
By specifying `MAP_RESIZABLE`, it allows us to keep the VMO which we
can then use for release purposes.
`releasePagesToOS` also had to be called the "proper" way, as Fuchsia
requires the `Offset` field to be correct. This has no impact on
non-Fuchsia platforms.

Differential Revision: https://reviews.llvm.org/D86800