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 */
58
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