LXR linux/include/linux/sched/sysctl.h

   1#ifndef _SCHED_SYSCTL_H
   2#define _SCHED_SYSCTL_H
   3
   4#ifdef CONFIG_DETECT_HUNG_TASK
   5extern unsigned int  sysctl_hung_task_panic;
   6extern unsigned long sysctl_hung_task_check_count;
   7extern unsigned long sysctl_hung_task_timeout_secs;
   8extern unsigned long sysctl_hung_task_warnings;
   9extern 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 */
  14enum { 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
  32extern int sysctl_max_map_count;
  33
  34extern unsigned int sysctl_sched_latency;
  35extern unsigned int sysctl_sched_min_granularity;
  36extern unsigned int sysctl_sched_wakeup_granularity;
  37extern unsigned int sysctl_sched_child_runs_first;
  38
  39enum sched_tunable_scaling {
  40        SCHED_TUNABLESCALING_NONE,
  41        SCHED_TUNABLESCALING_LOG,
  42        SCHED_TUNABLESCALING_LINEAR,
  43        SCHED_TUNABLESCALING_END,
  44};
  45extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
  46
  47extern unsigned int sysctl_numa_balancing_scan_delay;
  48extern unsigned int sysctl_numa_balancing_scan_period_min;
  49extern unsigned int sysctl_numa_balancing_scan_period_max;
  50extern unsigned int sysctl_numa_balancing_scan_period_reset;
  51extern unsigned int sysctl_numa_balancing_scan_size;
  52extern unsigned int sysctl_numa_balancing_settle_count;
  53
  54#ifdef CONFIG_SCHED_DEBUG
  55extern unsigned int sysctl_sched_migration_cost;
  56extern unsigned int sysctl_sched_nr_migrate;
  57extern unsigned int sysctl_sched_time_avg;
  58extern unsigned int sysctl_timer_migration;
  59extern unsigned int sysctl_sched_shares_window;
  60
  61int 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
  66static inline unsigned int get_sysctl_timer_migration(void)
  67{
  68        return sysctl_timer_migration;
  69}
  70#else
  71static 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 */
  83extern unsigned int sysctl_sched_rt_period;
  84extern int sysctl_sched_rt_runtime;
  85
  86#ifdef CONFIG_CFS_BANDWIDTH
  87extern unsigned int sysctl_sched_cfs_bandwidth_slice;
  88#endif
  89
  90#ifdef CONFIG_SCHED_AUTOGROUP
  91extern unsigned int sysctl_sched_autogroup_enabled;
  92#endif
  93
  94extern int sched_rr_timeslice;
  95
  96extern int sched_rr_handler(struct ctl_table *table, int write,
  97                void __user *buffer, size_t *lenp,
  98                loff_t *ppos);
  99
 100extern 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 */
 105