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Kernel: Add MAP_NORESERVE support to mmap
Rather than lazily committing regions by default, we now commit the entire region unless MAP_NORESERVE is specified. This solves random crashes in low-memory situations where e.g. the malloc heap allocated memory, but using pages that haven't been used before triggers a crash when no more physical memory is available. Use this flag to create large regions without actually committing the backing memory. madvise() can be used to commit arbitrary areas of such regions after creating them.
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7 changed files with 30 additions and 15 deletions
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@ -436,9 +436,9 @@ public:
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return m_euid == 0;
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}
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Region* allocate_region_with_vmobject(VirtualAddress, size_t, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const String& name, int prot);
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Region* allocate_region_with_vmobject(VirtualAddress, size_t, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const String& name, int prot, bool should_commit = true);
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Region* allocate_region(VirtualAddress, size_t, const String& name, int prot = PROT_READ | PROT_WRITE, bool should_commit = true);
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Region* allocate_region_with_vmobject(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const String& name, int prot);
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Region* allocate_region_with_vmobject(const Range&, NonnullRefPtr<VMObject>, size_t offset_in_vmobject, const String& name, int prot, bool should_commit = true);
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Region* allocate_region(const Range&, const String& name, int prot = PROT_READ | PROT_WRITE, bool should_commit = true);
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bool deallocate_region(Region& region);
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