#include <stdlib.h>#include <string.h>#include <malloc.h>#include <pthread.h>#include <unistd.h>#include <assert.h> #include <linux/mempool.h>#include <linux/poison.h>#include <linux/slab.h>#include <linux/radix-tree.h>#include <urcu/uatomic.h> int nr_allocated;int preempt_count; struct kmem_cache { pthread_mutex_t lock; int size; int nr_objs; void *objs; void (*ctor)(void *);}; void *mempool_alloc(mempool_t *pool, int gfp_mask){ return pool->alloc(gfp_mask, pool->data);} void mempool_free(void *element, mempool_t *pool){ pool->free(element, pool->data);} mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn, mempool_free_t *free_fn, void *pool_data){ mempool_t *ret = malloc(sizeof(*ret)); ret->alloc = alloc_fn; ret->free = free_fn; ret->data = pool_data; return ret;} void *kmem_cache_alloc(struct kmem_cache *cachep, int flags){ struct radix_tree_node *node; if (flags & __GFP_NOWARN) return NULL; pthread_mutex_lock(&cachep->lock); if (cachep->nr_objs) { cachep->nr_objs--; node = cachep->objs; cachep->objs = node->private_data; pthread_mutex_unlock(&cachep->lock); node->private_data = NULL; } else { pthread_mutex_unlock(&cachep->lock); node = malloc(cachep->size); if (cachep->ctor) cachep->ctor(node); } uatomic_inc(&nr_allocated); return node;} void kmem_cache_free(struct kmem_cache *cachep, void *objp){ assert(objp); uatomic_dec(&nr_allocated); pthread_mutex_lock(&cachep->lock); if (cachep->nr_objs > 10) { memset(objp, POISON_FREE, cachep->size); free(objp); } else { struct radix_tree_node *node = objp; cachep->nr_objs++; node->private_data = cachep->objs; cachep->objs = node; } pthread_mutex_unlock(&cachep->lock);} void *kmalloc(size_t size, gfp_t gfp){ void *ret = malloc(size); uatomic_inc(&nr_allocated); return ret;} void kfree(void *p){ if (!p) return; uatomic_dec(&nr_allocated); free(p);} struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t offset, unsigned long flags, void (*ctor)(void *)){ struct kmem_cache *ret = malloc(sizeof(*ret)); pthread_mutex_init(&ret->lock, NULL); ret->size = size; ret->nr_objs = 0; ret->objs = NULL; ret->ctor = ctor; return ret;}
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <pthread.h>
#include <unistd.h>
#include <assert.h>
#include <linux/mempool.h>
#include <linux/poison.h>
#include <linux/slab.h>
#include <linux/radix-tree.h>
#include <urcu/uatomic.h>
int nr_allocated;
int preempt_count;
struct kmem_cache {
pthread_mutex_t lock;
int size;
int nr_objs;
void *objs;
void (*ctor)(void *);
};
void *mempool_alloc(mempool_t *pool, int gfp_mask)
{
return pool->alloc(gfp_mask, pool->data);
}
void mempool_free(void *element, mempool_t *pool)
{
pool->free(element, pool->data);
}
mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
mempool_free_t *free_fn, void *pool_data)
{
mempool_t *ret = malloc(sizeof(*ret));
ret->alloc = alloc_fn;
ret->free = free_fn;
ret->data = pool_data;
return ret;
}
void *kmem_cache_alloc(struct kmem_cache *cachep, int flags)
{
struct radix_tree_node *node;
if (flags & __GFP_NOWARN)
return NULL;
pthread_mutex_lock(&cachep->lock);
if (cachep->nr_objs) {
cachep->nr_objs--;
node = cachep->objs;
cachep->objs = node->private_data;
pthread_mutex_unlock(&cachep->lock);
node->private_data = NULL;
} else {
pthread_mutex_unlock(&cachep->lock);
node = malloc(cachep->size);
if (cachep->ctor)
cachep->ctor(node);
}
uatomic_inc(&nr_allocated);
return node;
}
void kmem_cache_free(struct kmem_cache *cachep, void *objp)
{
assert(objp);
uatomic_dec(&nr_allocated);
pthread_mutex_lock(&cachep->lock);
if (cachep->nr_objs > 10) {
memset(objp, POISON_FREE, cachep->size);
free(objp);
} else {
struct radix_tree_node *node = objp;
cachep->nr_objs++;
node->private_data = cachep->objs;
cachep->objs = node;
}
pthread_mutex_unlock(&cachep->lock);
}
void *kmalloc(size_t size, gfp_t gfp)
{
void *ret = malloc(size);
uatomic_inc(&nr_allocated);
return ret;
}
void kfree(void *p)
{
if (!p)
return;
uatomic_dec(&nr_allocated);
free(p);
}
struct kmem_cache *
kmem_cache_create(const char *name, size_t size, size_t offset,
unsigned long flags, void (*ctor)(void *))
{
struct kmem_cache *ret = malloc(sizeof(*ret));
pthread_mutex_init(&ret->lock, NULL);
ret->size = size;
ret->nr_objs = 0;
ret->objs = NULL;
ret->ctor = ctor;
return ret;
}