xv6/param.h

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#define NPROC 64 // maximum number of processes
#define KSTACKSIZE 4096 // size of per-process kernel stack
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#define NCPU 8 // maximum number of CPUs
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#define NOFILE 16 // open files per process
#define NFILE 100 // open files per system
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#define NBUF 10 // size of disk block cache
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#define NINODE 50 // maximum number of active i-nodes
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#define NDEV 10 // maximum major device number
#define ROOTDEV 1 // device number of file system root disk
#define USERTOP 0xA0000 // end of user address space
#define PHYSTOP 0x1000000 // use phys mem up to here as free pool
#define MAXARG 32 // max exec arguments