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Support: mapped_file_region: Pass MAP_NORESERVE to mmap

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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
This commit is contained in:
Joseph Tremoulet 2021-04-08 09:06:52 -04:00
parent 0533f9d3ae
commit c47e6e9e06
1 changed files with 3 additions and 0 deletions
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3
lib/Support/Unix/Path.inc
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@ -815,6 +815,9 @@ std::error_code mapped_file_region::init(int FD, uint64_t Offset,
int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
#if defined(MAP_NORESERVE)
flags |= MAP_NORESERVE;
#endif
#if defined(__APPLE__)
//----------------------------------------------------------------------
// Newer versions of MacOSX have a flag that will allow us to read from