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...
* 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...
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 ...
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...
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
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 ...
typedefstruct_SET_DAX_ALLOC_ALIGNMENT_HINT_INPUT{ULONG Flags; ULONG AlignmentShift; ULONGLONG FileOffsetToAlign; ULONG FallbackAlignmentShift; } SET_DAX_ALLOC_ALIGNMENT_HINT_INPUT, *PSET_DAX_ALLOC_ALIGNMENT_HINT_INPUT; Membros Flags Os sinalizadores usados para o controle do sistema de ar...
[ 0.230000] Mount-cache hash table entries: 512 [ 0.230000] CPU: Testing write buffer coherency: ok [ 0.230000] devtmpfs: initialized [ 0.230000] TI81XX: Map 0x8ff00000 to 0xfe500000 for dram barrier [ 0.230000] TI81XX: Map 0x40300000 to 0xfe600000 for sram barrie...
May 12 12:30:24 raspberrypi kernel: [ 0.000709] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes) May 12 12:30:24 raspberrypi kernel: [ 0.001622] CPU: Testing write buffer coherency: ok May 12 12:30:24 raspberrypi kernel: [ 0.002082] CPU0: thread -1, cpu 0, sock...
struct binder_buffer *buffer; size_t buffer_size; size_t new_buffer_size; BUG_ON(!new_buffer->free); new_buffer_size = binder_alloc_buffer_size(alloc, new_buffer); binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC, "%d: add free buffer, size %zd, at %pK\n", alloc->pi...