103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_MEMORY_TIERS_H
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#define _LINUX_MEMORY_TIERS_H
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#include <linux/types.h>
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#include <linux/nodemask.h>
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#include <linux/kref.h>
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#include <linux/mmzone.h>
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/*
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* Each tier cover a abstrace distance chunk size of 128
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*/
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#define MEMTIER_CHUNK_BITS 7
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#define MEMTIER_CHUNK_SIZE (1 << MEMTIER_CHUNK_BITS)
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/*
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* Smaller abstract distance values imply faster (higher) memory tiers. Offset
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* the DRAM adistance so that we can accommodate devices with a slightly lower
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* adistance value (slightly faster) than default DRAM adistance to be part of
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* the same memory tier.
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*/
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#define MEMTIER_ADISTANCE_DRAM ((4 * MEMTIER_CHUNK_SIZE) + (MEMTIER_CHUNK_SIZE >> 1))
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#define MEMTIER_HOTPLUG_PRIO 100
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struct memory_tier;
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struct memory_dev_type {
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/* list of memory types that are part of same tier as this type */
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struct list_head tier_sibiling;
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/* abstract distance for this specific memory type */
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int adistance;
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/* Nodes of same abstract distance */
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nodemask_t nodes;
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struct kref kref;
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};
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#ifdef CONFIG_NUMA
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extern bool numa_demotion_enabled;
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struct memory_dev_type *alloc_memory_type(int adistance);
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void destroy_memory_type(struct memory_dev_type *memtype);
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void init_node_memory_type(int node, struct memory_dev_type *default_type);
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void clear_node_memory_type(int node, struct memory_dev_type *memtype);
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#ifdef CONFIG_MIGRATION
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int next_demotion_node(int node);
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void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets);
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bool node_is_toptier(int node);
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#else
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static inline int next_demotion_node(int node)
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{
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return NUMA_NO_NODE;
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}
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static inline void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets)
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{
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*targets = NODE_MASK_NONE;
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}
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static inline bool node_is_toptier(int node)
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{
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return true;
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}
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#endif
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#else
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#define numa_demotion_enabled false
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/*
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* CONFIG_NUMA implementation returns non NULL error.
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*/
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static inline struct memory_dev_type *alloc_memory_type(int adistance)
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{
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return NULL;
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}
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static inline void destroy_memory_type(struct memory_dev_type *memtype)
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{
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}
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static inline void init_node_memory_type(int node, struct memory_dev_type *default_type)
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{
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}
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static inline void clear_node_memory_type(int node, struct memory_dev_type *memtype)
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{
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}
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static inline int next_demotion_node(int node)
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{
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return NUMA_NO_NODE;
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}
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static inline void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets)
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{
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*targets = NODE_MASK_NONE;
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}
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static inline bool node_is_toptier(int node)
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{
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return true;
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}
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#endif /* CONFIG_NUMA */
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#endif /* _LINUX_MEMORY_TIERS_H */
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