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fix(aspacem): raise amd64 managed address ceiling to 1 TiB #22

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Merged
not-matthias merged 1 commit into from
Jul 9, 2026
Merged

fix(aspacem): raise amd64 managed address ceiling to 1 TiB #22

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10 changes: 10 additions & 0 deletions coregrind/m_aspacemgr/aspacemgr-linux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1862,7 +1862,17 @@ Addr VG_(am_startup) ( Addr sp_at_startup )
sp_at_startup );

# if VG_WORDSIZE == 8
# if defined(VGP_amd64_linux)
// Startup inserts a one-page reservation at vStart (the midpoint of
// [minAddr, maxAddr]), splitting the initial free space. A floating
// client mmap searches upward from cStart, so the largest contiguous
// hole it can get runs up to that split, i.e. ~half of maxAddr. 128G
// left only a ~64G client hole, rejecting multi-hundred-GB lazily-backed
// reservations. 1T gives a ~512G hole, well within amd64's 47-bit VA.
aspacem_maxAddr = (Addr)0x10000000000ULL - 1; // 1T
# else
aspacem_maxAddr = (Addr)0x2000000000ULL - 1; // 128G
# endif
# ifdef ENABLE_INNER
{ Addr cse = VG_PGROUNDDN( sp_at_startup ) - 1;
if (aspacem_maxAddr > cse)
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