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1306ff4c92
Created with shm_open2(SHM_LARGEPAGE) and then configured with FIOSSHMLPGCNF ioctl, largepages posix shared memory objects guarantee that all userspace mappings of it are served by superpage non-managed mappings. Only amd64 for now, both 2M and 1G superpages can be requested, the later requires CPU feature. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D24652