一、Mapping Functions 二、Persistently mapped memory(永久Mapping) 三、Cache flush and invalidate 四、检查内存是否可Mapping 总结 前言 本文为Vulkan® Memory Allocator系列系列教程,定时更新,请大家关注。如果需要深入学习Vulkan的同学,可以点击课程链接,学习链接: 腾讯课堂:《Vulkan原理与实战—铸造渲染核武器—基石...
你就得在CPU端读取之前,调用invalidate cache操作;在CPU写入数据后,进行flush cache操作(CPU的Cache到主存RAM都会有一些延迟)。Map/UnMap并不会自动的执行相关操作。所以Vulkan提供了vkFlushMappedMemoryRanges(),vkInvalidateMappedMemoryRanges()作为CPU写入/CPU读取相关的刷新函数。VMA提供了更为方便的接口vmaFlushAllocati...
In this technique, a number of mapping functions are used to transfer the data from main memory to cache memory. That means any main memory can be mapped into any cache line. Therefore, cache memory address is not in the use. Associative cache controller interprets the request by using the...
In Direct mapped cache memory, each block mapped to exactly one location in cache memory. A particular block of main memory can map the line number of cache is given by - Cache line number = (Block Address of Main Memory) modulo (Number of lines in Cache). ...
accesses to the appropriate subset of the last-level caches when, for example, some of the last-level caches are 'off.' The chip controls the power consumption by turning on and off cache slices based on power states, and consequently dynamically switches among at least two hash functions.Pat...
pkmap_count--- array in kernel 原型为:int pkmap_count[LAST_PKMAP]. The pkmap_count array includes LAST_PKMAP counters, one for each entry of the pkmap_page_table Page Table 用于记录counter。 1 The counteris0 The corresponding Page Table entrydoes not map any high-memory page frame andisu...
SEC_NOCACHE 0x10000000 Sets all pages to noncachable. Applications should not use this flag except when explicitly required for a device. Using the interlocked functions with memory mapped with SEC_NOCACHE can result in an EXCEPTION_ILLEGAL_INSTRUCTION exception. SEC_NOCACHE requires either S...
Sets all pages to be non-cacheable. Applications should not use this attribute except when explicitly required for a device. Using the interlocked functions with memory that is mapped with SEC_NOCACHE can result in an EXCEPTION_ILLEGAL_INSTRUCTION exception. SEC_NOCACHE requires either the SEC_...
Sets all pages to be non-cacheable. Applications should not use this attribute except when explicitly required for a device. Using the interlocked functions with memory that is mapped withSEC_NOCACHEcan result in anEXCEPTION_ILLEGAL_INSTRUCTIONexception. ...
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