dma-buf

最新推荐文章于 2025-06-03 14:08:18 发布

原创最新推荐文章于 2025-06-03 14:08:18 发布 · 515 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#android

本文探讨了intBufferAllocator::AllocSystem函数的工作原理，特别是在不需要CPU访问的情况下如何尝试在'system-uncached'堆中进行内存分配。通过对源代码的分析，揭示了在Android平台超级项目中的具体实现细节。

system_heap_do_allocate

cache 怎么理解

int BufferAllocator::AllocSystem(bool cpu_access_needed, size_t len, unsigned int heap_flags,
                                 size_t legacy_align) {
    if (!cpu_access_needed) {
        /*
         * CPU does not need to access allocated buffer so we try to allocate in
         * the 'system-uncached' heap after querying for its existence.
         */

https://cs.android.com/android/platform/superproject/+/master:system/memory/libdmabufheap/BufferAllocator.cpp;l=274?q=cpu_access_needed&sq=&ss=android%2Fplatform%2Fsuperproject