mmap len limits

Matthew Dillon dillon at
Tue Jul 28 19:51:31 PDT 2015

The manual page is old, I will correct it.  On 64-bit machines len is not
limited to 2G


On Tue, Jul 28, 2015 at 4:53 PM, Alex Merritt <merritt.alex at>

> Hi,
> In MMAP(2) it states "len is limited to 2GB" as offsets are 32-bit. Should
> this be saying the offset is limited to 2G, or is this statement correct?
> Why can sys_mmap not simply accept any len, then repeatedly call kern_mmap
> across the range in 2GB chunks, keeping this transparent to the user?
> -Alex
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