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https://github.com/edk2-porting/linux-next.git
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b56efcf0a4
Reduce high order allocations for some setups. (NR_CPUS=4096 -> we need 64KB per kmem_cache struct) We now allocate exact needed size (using nr_cpu_ids and nr_node_ids) This also makes code a bit smaller on x86_64, since some field offsets are less than the 127 limit : Before patch : # size mm/slab.o text data bss dec hex filename 22605 361665 32 384302 5dd2e mm/slab.o After patch : # size mm/slab.o text data bss dec hex filename 22349 353473 8224 384046 5dc2e mm/slab.o CC: Andrew Morton <akpm@linux-foundation.org> Reported-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
218 lines
5.0 KiB
C
218 lines
5.0 KiB
C
#ifndef _LINUX_SLAB_DEF_H
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#define _LINUX_SLAB_DEF_H
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/*
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* Definitions unique to the original Linux SLAB allocator.
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*
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* What we provide here is a way to optimize the frequent kmalloc
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* calls in the kernel by selecting the appropriate general cache
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* if kmalloc was called with a size that can be established at
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* compile time.
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*/
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#include <linux/init.h>
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#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
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#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
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#include <linux/compiler.h>
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#include <trace/events/kmem.h>
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/*
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* struct kmem_cache
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*
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* manages a cache.
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*/
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struct kmem_cache {
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/* 1) Cache tunables. Protected by cache_chain_mutex */
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unsigned int batchcount;
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unsigned int limit;
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unsigned int shared;
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unsigned int buffer_size;
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u32 reciprocal_buffer_size;
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/* 2) touched by every alloc & free from the backend */
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unsigned int flags; /* constant flags */
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unsigned int num; /* # of objs per slab */
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/* 3) cache_grow/shrink */
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/* order of pgs per slab (2^n) */
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unsigned int gfporder;
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/* force GFP flags, e.g. GFP_DMA */
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gfp_t gfpflags;
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size_t colour; /* cache colouring range */
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unsigned int colour_off; /* colour offset */
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struct kmem_cache *slabp_cache;
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unsigned int slab_size;
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unsigned int dflags; /* dynamic flags */
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/* constructor func */
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void (*ctor)(void *obj);
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/* 4) cache creation/removal */
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const char *name;
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struct list_head next;
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/* 5) statistics */
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#ifdef CONFIG_DEBUG_SLAB
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unsigned long num_active;
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unsigned long num_allocations;
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unsigned long high_mark;
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unsigned long grown;
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unsigned long reaped;
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unsigned long errors;
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unsigned long max_freeable;
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unsigned long node_allocs;
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unsigned long node_frees;
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unsigned long node_overflow;
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atomic_t allochit;
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atomic_t allocmiss;
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atomic_t freehit;
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atomic_t freemiss;
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/*
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* If debugging is enabled, then the allocator can add additional
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* fields and/or padding to every object. buffer_size contains the total
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* object size including these internal fields, the following two
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* variables contain the offset to the user object and its size.
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*/
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int obj_offset;
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int obj_size;
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#endif /* CONFIG_DEBUG_SLAB */
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/* 6) per-cpu/per-node data, touched during every alloc/free */
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/*
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* We put array[] at the end of kmem_cache, because we want to size
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* this array to nr_cpu_ids slots instead of NR_CPUS
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* (see kmem_cache_init())
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* We still use [NR_CPUS] and not [1] or [0] because cache_cache
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* is statically defined, so we reserve the max number of cpus.
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*/
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struct kmem_list3 **nodelists;
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struct array_cache *array[NR_CPUS];
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/*
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* Do not add fields after array[]
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*/
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};
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/* Size description struct for general caches. */
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struct cache_sizes {
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size_t cs_size;
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struct kmem_cache *cs_cachep;
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#ifdef CONFIG_ZONE_DMA
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struct kmem_cache *cs_dmacachep;
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#endif
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};
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extern struct cache_sizes malloc_sizes[];
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void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
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void *__kmalloc(size_t size, gfp_t flags);
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#ifdef CONFIG_TRACING
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extern void *kmem_cache_alloc_trace(size_t size,
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struct kmem_cache *cachep, gfp_t flags);
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extern size_t slab_buffer_size(struct kmem_cache *cachep);
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#else
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static __always_inline void *
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kmem_cache_alloc_trace(size_t size, struct kmem_cache *cachep, gfp_t flags)
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{
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return kmem_cache_alloc(cachep, flags);
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}
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static inline size_t slab_buffer_size(struct kmem_cache *cachep)
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{
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return 0;
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}
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#endif
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static __always_inline void *kmalloc(size_t size, gfp_t flags)
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{
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struct kmem_cache *cachep;
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void *ret;
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if (__builtin_constant_p(size)) {
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int i = 0;
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if (!size)
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return ZERO_SIZE_PTR;
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#define CACHE(x) \
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if (size <= x) \
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goto found; \
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else \
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i++;
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#include <linux/kmalloc_sizes.h>
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#undef CACHE
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return NULL;
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found:
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#ifdef CONFIG_ZONE_DMA
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if (flags & GFP_DMA)
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cachep = malloc_sizes[i].cs_dmacachep;
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else
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#endif
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cachep = malloc_sizes[i].cs_cachep;
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ret = kmem_cache_alloc_trace(size, cachep, flags);
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return ret;
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}
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return __kmalloc(size, flags);
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}
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#ifdef CONFIG_NUMA
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extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
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extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
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#ifdef CONFIG_TRACING
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extern void *kmem_cache_alloc_node_trace(size_t size,
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struct kmem_cache *cachep,
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gfp_t flags,
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int nodeid);
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#else
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static __always_inline void *
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kmem_cache_alloc_node_trace(size_t size,
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struct kmem_cache *cachep,
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gfp_t flags,
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int nodeid)
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{
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return kmem_cache_alloc_node(cachep, flags, nodeid);
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}
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#endif
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static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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{
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struct kmem_cache *cachep;
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if (__builtin_constant_p(size)) {
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int i = 0;
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if (!size)
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return ZERO_SIZE_PTR;
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#define CACHE(x) \
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if (size <= x) \
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goto found; \
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else \
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i++;
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#include <linux/kmalloc_sizes.h>
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#undef CACHE
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return NULL;
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found:
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#ifdef CONFIG_ZONE_DMA
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if (flags & GFP_DMA)
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cachep = malloc_sizes[i].cs_dmacachep;
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else
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#endif
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cachep = malloc_sizes[i].cs_cachep;
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return kmem_cache_alloc_node_trace(size, cachep, flags, node);
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}
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return __kmalloc_node(size, flags, node);
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}
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#endif /* CONFIG_NUMA */
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#endif /* _LINUX_SLAB_DEF_H */
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