[all-commits] [llvm/llvm-project] b785e0: Support: mapped_file_region: Pass MAP_NORESERVE t...

[Joseph Tremoulet via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b785e03612d76145c58cb31b6fd6911a5e41e8e3
      https://github.com/llvm/llvm-project/commit/b785e03612d76145c58cb31b6fd6911a5e41e8e3
  Author: Joseph Tremoulet <jotrem at microsoft.com>
  Date:   2021-04-08 (Thu, 08 Apr 2021)

  Changed paths:
    M llvm/lib/Support/Unix/Path.inc

  Log Message:
  -----------
  Support: mapped_file_region:  Pass MAP_NORESERVE to mmap

This allows mapping larger files, delaying OOM failures until too many
pages of them are accessed.  This is makes the behavior of the
mapped_file_region in this regard consistent between its "Unix" and
"Windows" implementations.

Guard the code witih #if defined(MAP_NORESERVE), consistent with other
uses of MAP_NORESERVE in llvm-project, because some FreeBSD versions do
not provide this flag.

Reviewed By: clayborg

Differential Revision: https://reviews.llvm.org/D96626