include/linux/sched/sysctl.h

   1 #ifndef _SCHED_SYSCTL_H
   2 #define _SCHED_SYSCTL_H
   3
   4 #ifdef CONFIG_DETECT_HUNG_TASK
   5 extern unsigned int  sysctl_hung_task_panic;
   6 extern unsigned long sysctl_hung_task_check_count;
   7 extern unsigned long sysctl_hung_task_timeout_secs;
   8 extern unsigned long 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 #define MAPCOUNT_ELF_CORE_MARGIN        (5)
  30 #define DEFAULT_MAX_MAP_COUNT   (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
  31
  32 extern int sysctl_max_map_count;
  33
  34 extern unsigned int sysctl_sched_latency;
  35 extern unsigned int sysctl_sched_min_granularity;
  36 extern unsigned int sysctl_sched_wakeup_granularity;
  37 extern unsigned int sysctl_sched_child_runs_first;
  38
  39 enum sched_tunable_scaling {
  40         SCHED_TUNABLESCALING_NONE,
  41         SCHED_TUNABLESCALING_LOG,
  42         SCHED_TUNABLESCALING_LINEAR,
  43         SCHED_TUNABLESCALING_END,
  44 };
  45 extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
  46
  47 extern unsigned int sysctl_numa_balancing_scan_delay;
  48 extern unsigned int sysctl_numa_balancing_scan_period_min;
  49 extern unsigned int sysctl_numa_balancing_scan_period_max;
  50 extern unsigned int sysctl_numa_balancing_scan_period_reset;
  51 extern unsigned int sysctl_numa_balancing_scan_size;
  52 extern unsigned int sysctl_numa_balancing_settle_count;
  53
  54 #ifdef CONFIG_SCHED_DEBUG
  55 extern unsigned int sysctl_sched_migration_cost;
  56 extern unsigned int sysctl_sched_nr_migrate;
  57 extern unsigned int sysctl_sched_time_avg;
  58 extern unsigned int sysctl_timer_migration;
  59 extern unsigned int sysctl_sched_shares_window;
  60
  61 int sched_proc_update_handler(struct ctl_table *table, int write,
  62                 void __user *buffer, size_t *length,
  63                 loff_t *ppos);
  64 #endif
  65 #ifdef CONFIG_SCHED_DEBUG
  66 static inline unsigned int get_sysctl_timer_migration(void)
  67 {
  68         return sysctl_timer_migration;
  69 }
  70 #else
  71 static inline unsigned int get_sysctl_timer_migration(void)
  72 {
  73         return 1;
  74 }
  75 #endif
  76
  77 /*
  78  *  control realtime throttling:
  79  *
  80  *  /proc/sys/kernel/sched_rt_period_us
  81  *  /proc/sys/kernel/sched_rt_runtime_us
  82  */
  83 extern unsigned int sysctl_sched_rt_period;
  84 extern int sysctl_sched_rt_runtime;
  85
  86 #ifdef CONFIG_CFS_BANDWIDTH
  87 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
  88 #endif
  89
  90 #ifdef CONFIG_SCHED_AUTOGROUP
  91 extern unsigned int sysctl_sched_autogroup_enabled;
  92 #endif
  93
  94 extern int sched_rr_timeslice;
  95
  96 extern int sched_rr_handler(struct ctl_table *table, int write,
  97                 void __user *buffer, size_t *lenp,
  98                 loff_t *ppos);
  99
 100 extern int sched_rt_handler(struct ctl_table *table, int write,
 101                 void __user *buffer, size_t *lenp,
 102                 loff_t *ppos);
 103
 104 #endif /* _SCHED_SYSCTL_H */