sys_upmap
struct sys_upmap *upmap;
upmap->header[0].offset = offsetof(struct sys_upmap, version);
upmap->header[1].offset = offsetof(struct sys_upmap, runticks);
upmap->header[2].offset = offsetof(struct sys_upmap, forkid);
upmap->header[3].offset = offsetof(struct sys_upmap, pid);
upmap->header[4].offset = offsetof(struct sys_upmap,proc_title);
upmap->header[5].offset = offsetof(struct sys_upmap, invfork);
struct sys_upmap *upmap;
struct sys_upmap *p_upmap; /* user RW mappable per-process page */