[Question] New mmap64 syscall?

Florian Weimer
2016-12-07T13:23:55Z

On 12/06/2016 07:54 PM, Yury Norov wrote:
> 3. Introduce new mmap64() syscall like this:
> sys_mmap64(void *addr, size_t len, int prot, int flags, int fd, struct off_pair *off);
> (The pointer here because otherwise we have 7 args, if simply pass off_hi and
> off_lo in registers.)

I would prefer a batched mmap/munmap/mremap/mprotect/madvise interface,
so that VM changes can be coalesced and the output reduced. This
interface could then be used to implement mmap on 32-bit architectures
as well because the offset restrictions would not apply there.

Thanks,
Florian