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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_THREADS_H
  3 #define _LINUX_THREADS_H
  4 
  5 
  6 /*
  7  * The default limit for the nr of threads is now in
  8  * /proc/sys/kernel/threads-max.
  9  */
 10 
 11 /*
 12  * Maximum supported processors.  Setting this smaller saves quite a
 13  * bit of memory.  Use nr_cpu_ids instead of this except for static bitmaps.
 14  */
 15 #ifndef CONFIG_NR_CPUS
 16 /* FIXME: This should be fixed in the arch's Kconfig */
 17 #define CONFIG_NR_CPUS  1
 18 #endif
 19 
 20 /* Places which use this should consider cpumask_var_t. */
 21 #define NR_CPUS         CONFIG_NR_CPUS
 22 
 23 #define MIN_THREADS_LEFT_FOR_ROOT 4
 24 
 25 /*
 26  * This controls the default maximum pid allocated to a process
 27  */
 28 #define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
 29 
 30 /*
 31  * A maximum of 4 million PIDs should be enough for a while.
 32  * [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.]
 33  */
 34 #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
 35         (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
 36 
 37 /*
 38  * Define a minimum number of pids per cpu.  Heuristically based
 39  * on original pid max of 32k for 32 cpus.  Also, increase the
 40  * minimum settable value for pid_max on the running system based
 41  * on similar defaults.  See kernel/pid.c:pidmap_init() for details.
 42  */
 43 #define PIDS_PER_CPU_DEFAULT    1024
 44 #define PIDS_PER_CPU_MIN        8
 45 
 46 #endif
 47 

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