mirror of https://gitee.com/openkylin/linux.git
121 lines
2.4 KiB
C
121 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <malloc.h>
|
|
#include <pthread.h>
|
|
#include <unistd.h>
|
|
#include <assert.h>
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/poison.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/radix-tree.h>
|
|
#include <urcu/uatomic.h>
|
|
|
|
int nr_allocated;
|
|
int preempt_count;
|
|
int kmalloc_verbose;
|
|
int test_verbose;
|
|
|
|
struct kmem_cache {
|
|
pthread_mutex_t lock;
|
|
unsigned int size;
|
|
unsigned int align;
|
|
int nr_objs;
|
|
void *objs;
|
|
void (*ctor)(void *);
|
|
};
|
|
|
|
void *kmem_cache_alloc(struct kmem_cache *cachep, int gfp)
|
|
{
|
|
void *p;
|
|
|
|
if (!(gfp & __GFP_DIRECT_RECLAIM))
|
|
return NULL;
|
|
|
|
pthread_mutex_lock(&cachep->lock);
|
|
if (cachep->nr_objs) {
|
|
struct radix_tree_node *node = cachep->objs;
|
|
cachep->nr_objs--;
|
|
cachep->objs = node->parent;
|
|
pthread_mutex_unlock(&cachep->lock);
|
|
node->parent = NULL;
|
|
p = node;
|
|
} else {
|
|
pthread_mutex_unlock(&cachep->lock);
|
|
if (cachep->align)
|
|
posix_memalign(&p, cachep->align, cachep->size);
|
|
else
|
|
p = malloc(cachep->size);
|
|
if (cachep->ctor)
|
|
cachep->ctor(p);
|
|
else if (gfp & __GFP_ZERO)
|
|
memset(p, 0, cachep->size);
|
|
}
|
|
|
|
uatomic_inc(&nr_allocated);
|
|
if (kmalloc_verbose)
|
|
printf("Allocating %p from slab\n", p);
|
|
return p;
|
|
}
|
|
|
|
void kmem_cache_free(struct kmem_cache *cachep, void *objp)
|
|
{
|
|
assert(objp);
|
|
uatomic_dec(&nr_allocated);
|
|
if (kmalloc_verbose)
|
|
printf("Freeing %p to slab\n", objp);
|
|
pthread_mutex_lock(&cachep->lock);
|
|
if (cachep->nr_objs > 10 || cachep->align) {
|
|
memset(objp, POISON_FREE, cachep->size);
|
|
free(objp);
|
|
} else {
|
|
struct radix_tree_node *node = objp;
|
|
cachep->nr_objs++;
|
|
node->parent = cachep->objs;
|
|
cachep->objs = node;
|
|
}
|
|
pthread_mutex_unlock(&cachep->lock);
|
|
}
|
|
|
|
void *kmalloc(size_t size, gfp_t gfp)
|
|
{
|
|
void *ret;
|
|
|
|
if (!(gfp & __GFP_DIRECT_RECLAIM))
|
|
return NULL;
|
|
|
|
ret = malloc(size);
|
|
uatomic_inc(&nr_allocated);
|
|
if (kmalloc_verbose)
|
|
printf("Allocating %p from malloc\n", ret);
|
|
if (gfp & __GFP_ZERO)
|
|
memset(ret, 0, size);
|
|
return ret;
|
|
}
|
|
|
|
void kfree(void *p)
|
|
{
|
|
if (!p)
|
|
return;
|
|
uatomic_dec(&nr_allocated);
|
|
if (kmalloc_verbose)
|
|
printf("Freeing %p to malloc\n", p);
|
|
free(p);
|
|
}
|
|
|
|
struct kmem_cache *
|
|
kmem_cache_create(const char *name, unsigned int size, unsigned int align,
|
|
unsigned int flags, void (*ctor)(void *))
|
|
{
|
|
struct kmem_cache *ret = malloc(sizeof(*ret));
|
|
|
|
pthread_mutex_init(&ret->lock, NULL);
|
|
ret->size = size;
|
|
ret->align = align;
|
|
ret->nr_objs = 0;
|
|
ret->objs = NULL;
|
|
ret->ctor = ctor;
|
|
return ret;
|
|
}
|