#define NPROC 64        // maximum number of processes
#define PAGE 4096       // granularity of user-space memory allocation
#define KSTACKSIZE PAGE // size of per-process kernel stack
#define NCPU 8          // maximum number of CPUs
#define NOFILE 16       // file descriptors per process
#define NFD 100         // file descriptors per system
#define NREQUEST 100    // outstanding disk requests
#define NBUF 10         // size of disk block cache
#define NINODE 100      // maximum number of active i-nodes
#define NDEV 10         // maximum major device number