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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_THREADS_H |
3 | #define _LINUX_THREADS_H | |
4 | ||
1da177e4 LT |
5 | |
6 | /* | |
7 | * The default limit for the nr of threads is now in | |
8 | * /proc/sys/kernel/threads-max. | |
9 | */ | |
10 | ||
11 | /* | |
278d1ed6 RR |
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. | |
1da177e4 | 14 | */ |
278d1ed6 RR |
15 | #ifndef CONFIG_NR_CPUS |
16 | /* FIXME: This should be fixed in the arch's Kconfig */ | |
17 | #define CONFIG_NR_CPUS 1 | |
1da177e4 LT |
18 | #endif |
19 | ||
278d1ed6 RR |
20 | /* Places which use this should consider cpumask_var_t. */ |
21 | #define NR_CPUS CONFIG_NR_CPUS | |
22 | ||
1da177e4 LT |
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 | /* | |
0771dfef | 31 | * A maximum of 4 million PIDs should be enough for a while. |
9c40365a | 32 | * [NOTE: PID/TIDs are limited to 2^30 ~= 1 billion, see FUTEX_TID_MASK.] |
1da177e4 LT |
33 | */ |
34 | #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \ | |
35 | (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT)) | |
36 | ||
72680a19 HB |
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 | ||
1da177e4 | 46 | #endif |