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Forked from Glasgow Haskell Compiler / GHC
6043 commits behind, 2 commits ahead of the upstream repository.
  • Ben Gamari's avatar
    a104508d
    rts: Allow ExecPage to allocate anywhere in address space · a104508d
    Ben Gamari authored and Marge Bot's avatar Marge Bot committed 
    Currently the ExecPage facility has two users:

 * GHCi, for constructing info tables, and
 * the adjustor allocation path

Despite neither of these have any spatial locality constraints ExecPage
was using the linker's `mmapAnonForLinker`, which tries hard to ensure
that mappings end up nearby the executable image. This makes adjustor
allocation needlessly subject to fragmentation concerns.

We now instead return less constrained mappings, improving the
robustness of the mechanism.

Addresses #25503.
    a104508d
    History
    rts: Allow ExecPage to allocate anywhere in address space
    Ben Gamari authored and Marge Bot's avatar Marge Bot committed 
    Currently the ExecPage facility has two users:

 * GHCi, for constructing info tables, and
 * the adjustor allocation path

Despite neither of these have any spatial locality constraints ExecPage
was using the linker's `mmapAnonForLinker`, which tries hard to ensure
that mappings end up nearby the executable image. This makes adjustor
allocation needlessly subject to fragmentation concerns.

We now instead return less constrained mappings, improving the
robustness of the mechanism.

Addresses #25503.
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