使用dma_sync_single_for_cpu/device时候,由于系统默认咱们处理了cache一致性,此时这两个函数并没有真正去刷cache,所以出现了问题; TODO dma_sync_single_for_cpu/device代码分析。重点在带有coherent,和不带coherent属性时,刷cache的操作; dma_alloc_cohenrent接口分析。重点在带有coherent,和不带coherent属性时,内存cache分析; 感觉dma_alloc_coherent接口...
Lethal Kernel Is Stability Kernel / Fork By No Gravity Kernel & Thanks by Pierre For Source - ipc/util.c, ipc_rcu_alloc: cacheline align allocation · Gustyx-Power/Lethal-Kernel@196aa01
offset是page中第一个object的偏移,可以用来做指定的alignment,不过一般设置为0. flag用来控制如何分配,是一些bitmask:SLAB_NO_REAP, SLAB_HWCACHE_ALIGN, SLAB_CACHE_DMA。 SLAB_NO_REAP: 禁止kernel在内存不够的情况下减小memory pool的内存占用,一般不设置。 SLAB_HWCACHE_ALIGN:会对每个data object对其到当前pl...
* rmem allocation. This function assumes that protocols which have * memory_pressure use sk_wmem_queued as write buffer accounting.*/int__sk_mem_schedule(structsock *sk,intsize,intkind) {intret, amt =sk_mem_pages(size); sk->sk_forward_alloc += amt <<SK_MEM_QUANTUM_SHIFT; ret=__sk...
void *umem_cache_alloc(umem_cache_t *cache, int flags); void umem_cache_free(umem_cache_t *cache, void *buffer); Description These functions create, destroy, and use an “object cache” An object cache is a collection of buffers of a single size, with optional content caching enabled ...
int__initmempool_alloc_slab_init(void){// 创建一个slab高速缓存kmem=kmem_cache_create("my_buffer",10000,0,SLAB_HWCACHE_ALIGN,NULL);if(kmem==NULL){printk("kmem_cache_create failed! \n");//输出失败信息return0;}else{printk("kmem_cache_create successfully! \n");element=mempool_alloc_slab...
The nvlist_size() function returns the minimum size of a contiguous buffer large enough to pack nvl. The encoding parameter specifies the method of encoding when packing nvl. Supported encoding methods are: NV_ENCODE_NATIVE Straight bcopy() as described in bcopy(9F). NV_ENCODE_XDR Use XDR ...
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FileOffsetToAlign 應該對齊指定AlignmentValue的檔案位移。 這應該對齊叢集。 只有在檔案位移和實體位址對齊 1gb 時,記憶體管理員才支援大型頁面。 FallbackAlignmentShift 如果旗標中有DAX_ALLOC_ALIGNMENT_FLAG_FALLBACK_SPECIFIED,此字段會指定後援區塊大小,以在找不到滿足 AlignmentShift 的配置時對齊檔案的...
netdev_alloc_cache被使用 netdev_alloc_frag和__netdev_alloc_skb调用的调用者使用。napi_alloc_cache 被调用__napi_alloc_frag和__napi_alloc_skb的调用者使用。这两个调用的主要区别是 被调用__napi_alloc_frag和napi_alloc_skb的调用者使用。这两个调用的主要区别是 它们可能被调用的环境。“netdev” ...