clayborg added a comment. One other optimization we can do is if we read from the process memory and it returns that is read zero bytes, right now we add the range we were trying to read into the m_invalid_ranges member variable. So lets say we were trying to read the range [0x1000-0x2000) on a mac. We will fail to read this due to __PAGEZERO, but I believe we currently add this range to the m_invalid_ranges. But we could ask about this memory region from the process and realize we can actually add [0x0-0x100000000) to the m_invalid_ranges. That might help avoid multiple bad reads from a large area that isn't mapped.
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