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Enable GC regions on macOS #125416

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Merged
agocke merged 4 commits into from
Mar 20, 2026
+5 −3
Merged

Enable GC regions on macOS #125416

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7c65443
Initial plan
Copilot Mar 10, 2026
5b41004
Enable GC regions on macOS by removing !defined(__APPLE__) guard
Copilot Mar 10, 2026
a0a4b52
Keep GC regions disabled on Apple mobile platforms (iOS, tvOS)
Copilot Mar 11, 2026
0f7ac94
Potential fix for pull request finding
agocke Mar 19, 2026
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8 changes: 5 additions & 3 deletions src/coreclr/gc/gcpriv.h
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Original file line number Diff line number Diff line change
Expand Up @@ -140,13 +140,15 @@ inline void FATAL_GC_ERROR()
//
// This means any empty regions can be freely used for any generation. For
// Server GC we will balance regions between heaps.
// For now disable regions for standalone GC and macOS builds
// For now disable regions for standalone GC builds
// For SunOS or illumos this is temporary, until we can add MAP_PRIVATE
// to the mmap() calls in unix/gcenv.unix.cpp More details here:
// https://github.com/dotnet/runtime/issues/104211
#if defined (HOST_64BIT) && !defined (BUILD_AS_STANDALONE) && !defined(__APPLE__) && !defined(__sun)
// Apple non-macOS platforms (such as iOS, tvOS, and Mac Catalyst) disallow
// the large virtual address space reservations that GC regions require.
#if defined (HOST_64BIT) && !defined (BUILD_AS_STANDALONE) && !defined(__sun) && (!defined(HOST_APPLE) || defined(HOST_OSX))
#define USE_REGIONS
#endif //HOST_64BIT && BUILD_AS_STANDALONE && !__APPLE__
#endif //HOST_64BIT && !BUILD_AS_STANDALONE && !__sun && (!HOST_APPLE || HOST_OSX)

//#define SPINLOCK_HISTORY
//#define RECORD_LOH_STATE
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