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