167 lines
4.1 KiB
C
167 lines
4.1 KiB
C
#ifndef _MM_PERCPU_INTERNAL_H
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#define _MM_PERCPU_INTERNAL_H
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#include <linux/types.h>
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#include <linux/percpu.h>
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struct pcpu_chunk {
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#ifdef CONFIG_PERCPU_STATS
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int nr_alloc; /* # of allocations */
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size_t max_alloc_size; /* largest allocation size */
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#endif
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struct list_head list; /* linked to pcpu_slot lists */
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int free_size; /* free bytes in the chunk */
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int contig_hint; /* max contiguous size hint */
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void *base_addr; /* base address of this chunk */
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int map_used; /* # of map entries used before the sentry */
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int map_alloc; /* # of map entries allocated */
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int *map; /* allocation map */
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struct list_head map_extend_list;/* on pcpu_map_extend_chunks */
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void *data; /* chunk data */
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int first_free; /* no free below this */
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bool immutable; /* no [de]population allowed */
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bool has_reserved; /* Indicates if chunk has reserved space
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at the beginning. Reserved chunk will
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contain reservation for static chunk.
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Dynamic chunk will contain reservation
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for static and reserved chunks. */
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int nr_populated; /* # of populated pages */
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unsigned long populated[]; /* populated bitmap */
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};
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extern spinlock_t pcpu_lock;
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extern struct list_head *pcpu_slot;
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extern int pcpu_nr_slots;
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extern struct pcpu_chunk *pcpu_first_chunk;
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extern struct pcpu_chunk *pcpu_reserved_chunk;
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#ifdef CONFIG_PERCPU_STATS
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#include <linux/spinlock.h>
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struct percpu_stats {
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u64 nr_alloc; /* lifetime # of allocations */
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u64 nr_dealloc; /* lifetime # of deallocations */
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u64 nr_cur_alloc; /* current # of allocations */
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u64 nr_max_alloc; /* max # of live allocations */
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u32 nr_chunks; /* current # of live chunks */
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u32 nr_max_chunks; /* max # of live chunks */
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size_t min_alloc_size; /* min allocaiton size */
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size_t max_alloc_size; /* max allocation size */
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};
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extern struct percpu_stats pcpu_stats;
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extern struct pcpu_alloc_info pcpu_stats_ai;
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/*
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* For debug purposes. We don't care about the flexible array.
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*/
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static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
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{
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memcpy(&pcpu_stats_ai, ai, sizeof(struct pcpu_alloc_info));
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/* initialize min_alloc_size to unit_size */
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pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size;
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}
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/*
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* pcpu_stats_area_alloc - increment area allocation stats
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* @chunk: the location of the area being allocated
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* @size: size of area to allocate in bytes
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*
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* CONTEXT:
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* pcpu_lock.
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*/
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static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
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{
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lockdep_assert_held(&pcpu_lock);
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pcpu_stats.nr_alloc++;
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pcpu_stats.nr_cur_alloc++;
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pcpu_stats.nr_max_alloc =
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max(pcpu_stats.nr_max_alloc, pcpu_stats.nr_cur_alloc);
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pcpu_stats.min_alloc_size =
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min(pcpu_stats.min_alloc_size, size);
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pcpu_stats.max_alloc_size =
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max(pcpu_stats.max_alloc_size, size);
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chunk->nr_alloc++;
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chunk->max_alloc_size = max(chunk->max_alloc_size, size);
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}
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/*
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* pcpu_stats_area_dealloc - decrement allocation stats
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* @chunk: the location of the area being deallocated
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*
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* CONTEXT:
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* pcpu_lock.
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*/
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static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
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{
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lockdep_assert_held(&pcpu_lock);
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pcpu_stats.nr_dealloc++;
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pcpu_stats.nr_cur_alloc--;
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chunk->nr_alloc--;
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}
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/*
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* pcpu_stats_chunk_alloc - increment chunk stats
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*/
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static inline void pcpu_stats_chunk_alloc(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&pcpu_lock, flags);
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pcpu_stats.nr_chunks++;
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pcpu_stats.nr_max_chunks =
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max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks);
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spin_unlock_irqrestore(&pcpu_lock, flags);
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}
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/*
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* pcpu_stats_chunk_dealloc - decrement chunk stats
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*/
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static inline void pcpu_stats_chunk_dealloc(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&pcpu_lock, flags);
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pcpu_stats.nr_chunks--;
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spin_unlock_irqrestore(&pcpu_lock, flags);
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}
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#else
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static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai)
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{
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}
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static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size)
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{
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}
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static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk)
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{
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}
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static inline void pcpu_stats_chunk_alloc(void)
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{
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}
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static inline void pcpu_stats_chunk_dealloc(void)
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{
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}
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#endif /* !CONFIG_PERCPU_STATS */
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#endif
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