include/linux/sched/sysctl.h

   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_sched_shares_window;
  61
  62 int sched_proc_update_handler(struct ctl_table *table, int write,
  63                 void __user *buffer, size_t *length,
  64                 loff_t *ppos);
  65 #endif
  66
  67 /*
  68  *  control realtime throttling:
  69  *
  70  *  /proc/sys/kernel/sched_rt_period_us
  71  *  /proc/sys/kernel/sched_rt_runtime_us
  72  */
  73 extern unsigned int sysctl_sched_rt_period;
  74 extern int sysctl_sched_rt_runtime;
  75
  76 #ifdef CONFIG_CFS_BANDWIDTH
  77 extern unsigned int sysctl_sched_cfs_bandwidth_slice;
  78 #endif
  79
  80 #ifdef CONFIG_SCHED_AUTOGROUP
  81 extern unsigned int sysctl_sched_autogroup_enabled;
  82 #endif
  83
  84 extern int sched_rr_timeslice;
  85
  86 extern int sched_rr_handler(struct ctl_table *table, int write,
  87                 void __user *buffer, size_t *lenp,
  88                 loff_t *ppos);
  89
  90 extern int sched_rt_handler(struct ctl_table *table, int write,
  91                 void __user *buffer, size_t *lenp,
  92                 loff_t *ppos);
  93
  94 extern int sysctl_numa_balancing(struct ctl_table *table, int write,
  95                                  void __user *buffer, size_t *lenp,
  96                                  loff_t *ppos);
  97
  98 extern int sysctl_schedstats(struct ctl_table *table, int write,
  99                                  void __user *buffer, size_t *lenp,
 100                                  loff_t *ppos);
 101
 102 #endif /* _SCHED_SYSCTL_H */