include/linux/sched/numa_balancing.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_SCHED_NUMA_BALANCING_H
   3 #define _LINUX_SCHED_NUMA_BALANCING_H
   4
   5 /*
   6  * This is the interface between the scheduler and the MM that
   7  * implements memory access pattern based NUMA-balancing:
   8  */
   9
  10 #include <linux/sched.h>
  11
  12 #define TNF_MIGRATED    0x01
  13 #define TNF_NO_GROUP    0x02
  14 #define TNF_SHARED      0x04
  15 #define TNF_FAULT_LOCAL 0x08
  16 #define TNF_MIGRATE_FAIL 0x10
  17
  18 #ifdef CONFIG_NUMA_BALANCING
  19 extern void task_numa_fault(int last_node, int node, int pages, int flags);
  20 extern pid_t task_numa_group_id(struct task_struct *p);
  21 extern void set_numabalancing_state(bool enabled);
  22 extern void task_numa_free(struct task_struct *p);
  23 extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page,
  24                                         int src_nid, int dst_cpu);
  25 #else
  26 static inline void task_numa_fault(int last_node, int node, int pages,
  27                                    int flags)
  28 {
  29 }
  30 static inline pid_t task_numa_group_id(struct task_struct *p)
  31 {
  32         return 0;
  33 }
  34 static inline void set_numabalancing_state(bool enabled)
  35 {
  36 }
  37 static inline void task_numa_free(struct task_struct *p)
  38 {
  39 }
  40 static inline bool should_numa_migrate_memory(struct task_struct *p,
  41                                 struct page *page, int src_nid, int dst_cpu)
  42 {
  43         return true;
  44 }
  45 #endif
  46
  47 #endif /* _LINUX_SCHED_NUMA_BALANCING_H */