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[mirror_ubuntu-bionic-kernel.git] / include / linux / threads.h
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