内核初始化的时候skb_init调用kmem_cache_create来创建"skbuff_head_cache"和"skbuff_fclone_cache"这两个memory cache,其执行的是mm/slub.c中定义的kmem_cache_create函数,看看该函数的实现就清楚了(其先通过find_mergeable看看有无现成的可以结构)。 内核相关实现在kmem_cache_create->sysfs_slab_alias这个函数中...
kfree_skb(skb)__kfree_skb(skb)kfree_skbmem(skb)kmem_cache_free(skbuff_head_cache, skb) 最终kfree_skb把sk_buff结构返回给skbuff_head_cache缓存。 原文作者:首页 - 内核技术中文网 - 构建全国最权威的内核技术交流分享论坛 原文地址:Linux内核之sk_buff解析 - 圈点 - 内核技术中文网 - ...
void__initskb_init(void){skbuff_head_cache=kmem_cache_create("skbuff_head_cache",sizeof(structsk_buff),0,SLAB_HWCACHE_ALIGN|SLAB_PANIC,NULL);skbuff_fclone_cache=kmem_cache_create("skbuff_fclone_cache",sizeof(structsk_buff_fclones),0,SLAB_HWCACHE_ALIGN|SLAB_PANIC,NULL);} 一般情况下,skb...
(Any idea?) I have checked mesh_stats in debugfs while skbuff_head_cache allocating memory. observation is: dropped_frames_ttl, fwded_mcast and fwded_unicast frames are increasing continuously. Please help me.gravikumar92 changed the title skbuff_head_cache all system memory and invoking oom ...
statickmem_cache_t*skbuff_head_cache; /* * Keep out-of-line to prevent kernel bloat. * __builtin_return_address is not used because it is not always * reliable. */ /** * skb_over_panic - private function * @skb: buffer
cache = fclone ? skbuff_fclone_cache : skbuff_head_cache;// 根据克隆状态来判断在哪一个缓冲区进行分配cache /* Get the HEAD */ skb = kmem_cache_alloc(cache, gfp_mask & ~__GFP_DMA);// 得到skb,注意这里没有包含数据,仅仅是skb_buff这个结构体 ...
在第一个节点前面会插入另一个结构sk_buff_head,这是一个辅助节点(作为sk_buff双向链表的头),它的定义如下:structsk_buff_headstructsk_buff-*next;structsk_buff-*prev;_u32qlen;spinlock_tlock;qlen代表链表元素的个数lock用于防止对链表的并发访问sk_buff和sk_buff_head的前两个元素 4、是一样的:next和...
_head_ _cache static struct kmem_cache*skbuff_head_cache__read_mostly;skbuff_head_cache在创建时指定的单位内存区域的大小是sizeof(struct sk_buff),可以容纳任意数目的struct sk_buff。 _ , skbuff_ _fclone_ _cache static struct kmem_cache*skbuff_fclone_cache__read_mostly;skbuff_fclone_cache在创建...
_cache = kmem_cache_create(skbuff_fclone_cache, (2*sizeof(struct sk_buff)) +sizeof(atomic_t), 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL); } 这个函数主要的目的就是在系统启动或者模块加载时,创建两个后备高速缓存 (looaside cache),它们分别是 skbuff_head_cache 和 skbuff_fclone_cache ...
statickmem_cache_t*skbuff_head_cache; /* * Keep out-of-line to prevent kernel bloat. * __builtin_return_address is not used because it is not always * reliable. */ /** * skb_over_panic - private function * @skb: buffer