1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 21da177e4SLinus Torvalds #ifndef _LINUX_THREADS_H 31da177e4SLinus Torvalds #define _LINUX_THREADS_H 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds /* 71da177e4SLinus Torvalds * The default limit for the nr of threads is now in 81da177e4SLinus Torvalds * /proc/sys/kernel/threads-max. 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds /* 12278d1ed6SRusty Russell * Maximum supported processors. Setting this smaller saves quite a 13278d1ed6SRusty Russell * bit of memory. Use nr_cpu_ids instead of this except for static bitmaps. 141da177e4SLinus Torvalds */ 15278d1ed6SRusty Russell #ifndef CONFIG_NR_CPUS 16278d1ed6SRusty Russell /* FIXME: This should be fixed in the arch's Kconfig */ 17278d1ed6SRusty Russell #define CONFIG_NR_CPUS 1 181da177e4SLinus Torvalds #endif 191da177e4SLinus Torvalds 20278d1ed6SRusty Russell /* Places which use this should consider cpumask_var_t. */ 21278d1ed6SRusty Russell #define NR_CPUS CONFIG_NR_CPUS 22278d1ed6SRusty Russell 231da177e4SLinus Torvalds #define MIN_THREADS_LEFT_FOR_ROOT 4 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds /* 261da177e4SLinus Torvalds * This controls the default maximum pid allocated to a process 271da177e4SLinus Torvalds */ 281da177e4SLinus Torvalds #define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000) 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds /* 310771dfefSIngo Molnar * A maximum of 4 million PIDs should be enough for a while. 329c40365aSJann Horn * [NOTE: PID/TIDs are limited to 2^30 ~= 1 billion, see FUTEX_TID_MASK.] 331da177e4SLinus Torvalds */ 341da177e4SLinus Torvalds #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \ 351da177e4SLinus Torvalds (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT)) 361da177e4SLinus Torvalds 3772680a19SHedi Berriche /* 3872680a19SHedi Berriche * Define a minimum number of pids per cpu. Heuristically based 3972680a19SHedi Berriche * on original pid max of 32k for 32 cpus. Also, increase the 4072680a19SHedi Berriche * minimum settable value for pid_max on the running system based 41*5b91a75bSTakahiro Itazuri * on similar defaults. See kernel/pid.c:pid_idr_init() for details. 4272680a19SHedi Berriche */ 4372680a19SHedi Berriche #define PIDS_PER_CPU_DEFAULT 1024 4472680a19SHedi Berriche #define PIDS_PER_CPU_MIN 8 4572680a19SHedi Berriche 461da177e4SLinus Torvalds #endif 47