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  1. #ifndef _LINUX_THREADS_H
  2. #define _LINUX_THREADS_H
  3.  
  4.  
  5. /*
  6.  * The default limit for the nr of threads is now in
  7.  * /proc/sys/kernel/threads-max.
  8.  */
  9.  
  10. /*
  11.  * Maximum supported processors.  Setting this smaller saves quite a
  12.  * bit of memory.  Use nr_cpu_ids instead of this except for static bitmaps.
  13.  */
  14. #ifndef CONFIG_NR_CPUS
  15. /* FIXME: This should be fixed in the arch's Kconfig */
  16. #define CONFIG_NR_CPUS  1
  17. #endif
  18.  
  19. /* Places which use this should consider cpumask_var_t. */
  20. #define NR_CPUS         CONFIG_NR_CPUS
  21.  
  22. #define MIN_THREADS_LEFT_FOR_ROOT 4
  23.  
  24. /*
  25.  * This controls the default maximum pid allocated to a process
  26.  */
  27. #define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
  28.  
  29. /*
  30.  * A maximum of 4 million PIDs should be enough for a while.
  31.  * [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.]
  32.  */
  33. #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
  34.         (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
  35.  
  36. /*
  37.  * Define a minimum number of pids per cpu.  Heuristically based
  38.  * on original pid max of 32k for 32 cpus.  Also, increase the
  39.  * minimum settable value for pid_max on the running system based
  40.  * on similar defaults.  See kernel/pid.c:pidmap_init() for details.
  41.  */
  42. #define PIDS_PER_CPU_DEFAULT    1024
  43. #define PIDS_PER_CPU_MIN        8
  44.  
  45. #endif
  46.