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