suggestions for fixed mmap addresses on x86_64?

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Hello,

Could anyone advise on good addresses to use for mmap'ing some
(position-dependent) data files on x86_64 linux?   On 32-bit
I was using 0xD000000 which seemed to be a plausible free area.
Despite some googling I haven't managed to find a description
of the x86_64 process virt memory layout, so although I guess
the 64-bit addresss space is so enormous that almost anything
in the middle would do fine, I would welcome any advice.

Many thanks!

Anthony




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