1 #ifndef _SCHED_SYSCTL_H
2 #define _SCHED_SYSCTL_H
3
4 #ifdef CONFIG_DETECT_HUNG_TASK
5 extern int sysctl_hung_task_check_count;
6 extern unsigned int sysctl_hung_task_panic;
7 extern unsigned long sysctl_hung_task_timeout_secs;
8 extern int sysctl_hung_task_warnings;
9 extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
10 void __user *buffer,
11 size_t *lenp, loff_t *ppos);
12 #else
13 /* Avoid need for ifdefs elsewhere in the code */
14 enum { sysctl_hung_task_timeout_secs = 0 };
15 #endif
16
17 /*
18 * Default maximum number of active map areas, this limits the number of vmas
19 * per mm struct. Users can overwrite this number by sysctl but there is a
20 * problem.
21 *
22 * When a program's coredump is generated as ELF format, a section is created
23 * per a vma. In ELF, the number of sections is represented in unsigned short.
24 * This means the number of sections should be smaller than 65535 at coredump.
25 * Because the kernel adds some informative sections to a image of program at
26 * generating coredump, we need some margin. The number of extra sections is
27 * 1-3 now and depends on arch. We use "5" as safe margin, here.
28 *
29 * ELF extended numbering allows more than 65535 sections, so 16-bit bound is
30 * not a hard limit any more. Although some userspace tools can be surprised by
31 * that.
32 */
33 #define MAPCOUNT_ELF_CORE_MARGIN (5)
34 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
35
36 extern int sysctl_max_map_count;
37
38 extern unsigned int sysctl_sched_latency;
39 extern unsigned int sysctl_sched_min_granularity;
40 extern unsigned int sysctl_sched_wakeup_granularity;
41 extern unsigned int sysctl_sched_child_runs_first;
42
43 enum sched_tunable_scaling {
44 SCHED_TUNABLESCALING_NONE,
45 SCHED_TUNABLESCALING_LOG,
46 SCHED_TUNABLESCALING_LINEAR,
47 SCHED_TUNABLESCALING_END,
48 };
49 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
50
51 extern unsigned int sysctl_numa_balancing_scan_delay;
52 extern unsigned int sysctl_numa_balancing_scan_period_min;
53 extern unsigned int sysctl_numa_balancing_scan_period_max;
54 extern unsigned int sysctl_numa_balancing_scan_size;
55
56 #ifdef CONFIG_SCHED_DEBUG
57 extern unsigned int sysctl_sched_migration_cost;
58 extern unsigned int sysctl_sched_nr_migrate;
59 extern unsigned int sysctl_sched_time_avg;
60 extern unsigned int sysctl_timer_migration;
61 extern unsigned int sysctl_sched_shares_window;
62
63 int sched_proc_update_handler(struct ctl_table *table, int write,
64 void __user *buffer, size_t *length,
65 loff_t *ppos);
66 #endif
67 #ifdef CONFIG_SCHED_DEBUG
get_sysctl_timer_migration(void)68 static inline unsigned int get_sysctl_timer_migration(void)
69 {
70 return sysctl_timer_migration;
71 }
72 #else
get_sysctl_timer_migration(void)73 static inline unsigned int get_sysctl_timer_migration(void)
74 {
75 return 1;
76 }
77 #endif
78
79 /*
80 * control realtime throttling:
81 *
82 * /proc/sys/kernel/sched_rt_period_us
83 * /proc/sys/kernel/sched_rt_runtime_us
84 */
85 extern unsigned int sysctl_sched_rt_period;
86 extern int sysctl_sched_rt_runtime;
87
88 #ifdef CONFIG_CFS_BANDWIDTH
89 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
90 #endif
91
92 #ifdef CONFIG_SCHED_AUTOGROUP
93 extern unsigned int sysctl_sched_autogroup_enabled;
94 #endif
95
96 extern int sched_rr_timeslice;
97
98 extern int sched_rr_handler(struct ctl_table *table, int write,
99 void __user *buffer, size_t *lenp,
100 loff_t *ppos);
101
102 extern int sched_rt_handler(struct ctl_table *table, int write,
103 void __user *buffer, size_t *lenp,
104 loff_t *ppos);
105
106 extern int sysctl_numa_balancing(struct ctl_table *table, int write,
107 void __user *buffer, size_t *lenp,
108 loff_t *ppos);
109
110 #endif /* _SCHED_SYSCTL_H */
111