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