mm/shuffle.h

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright(c) 2018 Intel Corporation. All rights reserved.
   3 #ifndef _MM_SHUFFLE_H
   4 #define _MM_SHUFFLE_H
   5 #include <linux/jump_label.h>
   6
   7 #define SHUFFLE_ORDER MAX_PAGE_ORDER
   8
   9 #ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR
  10 DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
  11 extern void __shuffle_free_memory(pg_data_t *pgdat);
  12 extern bool shuffle_pick_tail(void);
  13 static inline void __meminit shuffle_free_memory(pg_data_t *pgdat)
  14 {
  15         if (!static_branch_unlikely(&page_alloc_shuffle_key))
  16                 return;
  17         __shuffle_free_memory(pgdat);
  18 }
  19
  20 extern void __shuffle_zone(struct zone *z);
  21 static inline void __meminit shuffle_zone(struct zone *z)
  22 {
  23         if (!static_branch_unlikely(&page_alloc_shuffle_key))
  24                 return;
  25         __shuffle_zone(z);
  26 }
  27
  28 static inline bool is_shuffle_order(int order)
  29 {
  30         if (!static_branch_unlikely(&page_alloc_shuffle_key))
  31                 return false;
  32         return order >= SHUFFLE_ORDER;
  33 }
  34 #else
  35 static inline bool shuffle_pick_tail(void)
  36 {
  37         return false;
  38 }
  39
  40 static inline void shuffle_free_memory(pg_data_t *pgdat)
  41 {
  42 }
  43
  44 static inline void shuffle_zone(struct zone *z)
  45 {
  46 }
  47
  48 static inline bool is_shuffle_order(int order)
  49 {
  50         return false;
  51 }
  52 #endif
  53 #endif /* _MM_SHUFFLE_H */