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 enum numa_vmaskip_reason {
  19         NUMAB_SKIP_UNSUITABLE,
  20         NUMAB_SKIP_SHARED_RO,
  21         NUMAB_SKIP_INACCESSIBLE,
  22         NUMAB_SKIP_SCAN_DELAY,
  23         NUMAB_SKIP_PID_INACTIVE,
  24         NUMAB_SKIP_IGNORE_PID,
  25         NUMAB_SKIP_SEQ_COMPLETED,
  26 };
  27
  28 #ifdef CONFIG_NUMA_BALANCING
  29 extern void task_numa_fault(int last_node, int node, int pages, int flags);
  30 extern pid_t task_numa_group_id(struct task_struct *p);
  31 extern void set_numabalancing_state(bool enabled);
  32 extern void task_numa_free(struct task_struct *p, bool final);
  33 bool should_numa_migrate_memory(struct task_struct *p, struct folio *folio,
  34                                 int src_nid, int dst_cpu);
  35 #else
  36 static inline void task_numa_fault(int last_node, int node, int pages,
  37                                    int flags)
  38 {
  39 }
  40 static inline pid_t task_numa_group_id(struct task_struct *p)
  41 {
  42         return 0;
  43 }
  44 static inline void set_numabalancing_state(bool enabled)
  45 {
  46 }
  47 static inline void task_numa_free(struct task_struct *p, bool final)
  48 {
  49 }
  50 static inline bool should_numa_migrate_memory(struct task_struct *p,
  51                                 struct folio *folio, int src_nid, int dst_cpu)
  52 {
  53         return true;
  54 }
  55 #endif
  56
  57 #endif /* _LINUX_SCHED_NUMA_BALANCING_H */