1 #ifndef _SCHED_SYSCTL_H
2 #define _SCHED_SYSCTL_H
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,
11 size_t *lenp, loff_t *ppos);
13 /* Avoid need for ifdefs elsewhere in the code */
14 enum { sysctl_hung_task_timeout_secs = 0 };
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
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.
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
33 #define MAPCOUNT_ELF_CORE_MARGIN (5)
34 #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
36 extern int sysctl_max_map_count;
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;
43 enum sched_tunable_scaling {
44 SCHED_TUNABLESCALING_NONE,
45 SCHED_TUNABLESCALING_LOG,
46 SCHED_TUNABLESCALING_LINEAR,
47 SCHED_TUNABLESCALING_END,
49 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
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;
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_sched_shares_window;
62 int sched_proc_update_handler(struct ctl_table *table, int write,
63 void __user *buffer, size_t *length,
68 * control realtime throttling:
70 * /proc/sys/kernel/sched_rt_period_us
71 * /proc/sys/kernel/sched_rt_runtime_us
73 extern unsigned int sysctl_sched_rt_period;
74 extern int sysctl_sched_rt_runtime;
76 #ifdef CONFIG_CFS_BANDWIDTH
77 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
80 #ifdef CONFIG_SCHED_AUTOGROUP
81 extern unsigned int sysctl_sched_autogroup_enabled;
84 extern int sched_rr_timeslice;
86 extern int sched_rr_handler(struct ctl_table *table, int write,
87 void __user *buffer, size_t *lenp,
90 extern int sched_rt_handler(struct ctl_table *table, int write,
91 void __user *buffer, size_t *lenp,
94 extern int sysctl_numa_balancing(struct ctl_table *table, int write,
95 void __user *buffer, size_t *lenp,
98 #endif /* _SCHED_SYSCTL_H */