Extended Memory (XMEM) support provides a mechanism that allows a single 32-bit process to efficiently allocate and manage more than 4 Gbytes of physical memory. The XMEM feature is implemented as a file system (xmemfs) that system administrators can mount and use to reserve memory for applications.
For more information, see the man pages mount_xmemfs(1M) and xmemfs(7FS).
This feature was first available in the Solaris 7 11/99 release.