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TOMOYO Linux Cross Reference
Linux/include/linux/threads.h

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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 

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