267 lines
7.3 KiB
C
267 lines
7.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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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#include <linux/memcontrol.h>
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/*
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* pcpu_block_md is the metadata block struct.
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* Each chunk's bitmap is split into a number of full blocks.
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* All units are in terms of bits.
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*
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* The scan hint is the largest known contiguous area before the contig hint.
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* It is not necessarily the actual largest contig hint though. There is an
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* invariant that the scan_hint_start > contig_hint_start iff
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* scan_hint == contig_hint. This is necessary because when scanning forward,
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* we don't know if a new contig hint would be better than the current one.
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*/
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struct pcpu_block_md {
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int scan_hint; /* scan hint for block */
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int scan_hint_start; /* block relative starting
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position of the scan hint */
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int contig_hint; /* contig hint for block */
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int contig_hint_start; /* block relative starting
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position of the contig hint */
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int left_free; /* size of free space along
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the left side of the block */
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int right_free; /* size of free space along
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the right side of the block */
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int first_free; /* block position of first free */
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int nr_bits; /* total bits responsible for */
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};
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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_bytes; /* free bytes in the chunk */
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struct pcpu_block_md chunk_md;
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unsigned long *bound_map; /* boundary map */
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/*
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* base_addr is the base address of this chunk.
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* To reduce false sharing, current layout is optimized to make sure
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* base_addr locate in the different cacheline with free_bytes and
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* chunk_md.
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*/
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void *base_addr ____cacheline_aligned_in_smp;
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unsigned long *alloc_map; /* allocation map */
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struct pcpu_block_md *md_blocks; /* metadata blocks */
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void *data; /* chunk data */
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bool immutable; /* no [de]population allowed */
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bool isolated; /* isolated from active chunk
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slots */
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int start_offset; /* the overlap with the previous
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region to have a page aligned
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base_addr */
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int end_offset; /* additional area required to
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have the region end page
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aligned */
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#ifdef CONFIG_MEMCG_KMEM
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struct obj_cgroup **obj_cgroups; /* vector of object cgroups */
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#endif
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int nr_pages; /* # of pages served by this chunk */
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int nr_populated; /* # of populated pages */
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int nr_empty_pop_pages; /* # of empty 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_chunk_lists;
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extern int pcpu_nr_slots;
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extern int pcpu_sidelined_slot;
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extern int pcpu_to_depopulate_slot;
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extern int pcpu_nr_empty_pop_pages;
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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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/**
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* pcpu_chunk_nr_blocks - converts nr_pages to # of md_blocks
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* @chunk: chunk of interest
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*
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* This conversion is from the number of physical pages that the chunk
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* serves to the number of bitmap blocks used.
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*/
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static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk)
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{
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return chunk->nr_pages * PAGE_SIZE / PCPU_BITMAP_BLOCK_SIZE;
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}
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/**
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* pcpu_nr_pages_to_map_bits - converts the pages to size of bitmap
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* @pages: number of physical pages
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*
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* This conversion is from physical pages to the number of bits
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* required in the bitmap.
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*/
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static inline int pcpu_nr_pages_to_map_bits(int pages)
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{
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return pages * PAGE_SIZE / PCPU_MIN_ALLOC_SIZE;
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}
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/**
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* pcpu_chunk_map_bits - helper to convert nr_pages to size of bitmap
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* @chunk: chunk of interest
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*
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* This conversion is from the number of physical pages that the chunk
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* serves to the number of bits in the bitmap.
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*/
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static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk)
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{
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return pcpu_nr_pages_to_map_bits(chunk->nr_pages);
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}
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/**
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* pcpu_obj_full_size - helper to calculate size of each accounted object
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* @size: size of area to allocate in bytes
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*
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* For each accounted object there is an extra space which is used to store
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* obj_cgroup membership if kmemcg is not disabled. Charge it too.
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*/
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static inline size_t pcpu_obj_full_size(size_t size)
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{
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size_t extra_size = 0;
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#ifdef CONFIG_MEMCG_KMEM
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if (!mem_cgroup_kmem_disabled())
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extra_size += size / PCPU_MIN_ALLOC_SIZE * sizeof(struct obj_cgroup *);
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#endif
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return size * num_possible_cpus() + extra_size;
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}
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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 allocation 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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