一、mmap_region 函数执行流程 1、检查内存申请是否合法 2、创建 " 虚拟内存区域 " 二、mmap_region 函数源码 调用mmap 系统调用 , 先检查 " 偏移 " 是否是 " 内存页大小 " 的 " 整数倍 " , 如果偏移是内存页大小的整数倍 , 则调用 sys_mmap_pgoff 函数, 继续向下执行 ; 在sys_mmap_pgoff 系统调用
调用mmap 系统调用 , 先检查 " 偏移 " 是否是 " 内存页大小 " 的 " 整数倍 " , 如果偏移是内存页大小的整数倍 , 则调用 sys_mmap_pgoff 函数 , 继续向下执行 ; 在sys_mmap_pgoff 系统调用函数 中 , 最后调用了 vm_mmap_pgoff ...
mm/mmap: avoid zeroing vma tree in mmap_region() Browse files Instead of zeroing the vma tree and then overwriting the area, let the area be overwritten and then clean up the gathered vmas using vms_complete_munmap_vmas(). To ensure locking is downgraded correctly, the mm is set ...
Use a mmap_region_t as parameter instead of getting a parameter for each structure member. This reduces the scope of changes when adding members to mmap_region_t. Also align on the convention of using mm_cursor as a variable name for the currently inspec
int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size); mapfd(fd, size);//把刚才那个fd通过mmap方式得到一块内存 //不明白得去man mmap看看 mapfd完了后,mBase变量指向内存的起始位置, mSize是分配的内存大小,mFd是 ...
intfd=ashmem_create_region(name==NULL?MemoryHeapBase:name,size); mapfd(fd,size);//把刚才那个fd通过mmap方式得到一块内存 //不明白得去manmmap看看 mapfd完了后,mBase变量指向内存的起始位置,mSize是分配的内存大小,mFd是 ashmem_create_region返回的文件描述符 ...
qspi_base and qspi_mmap region are tightly bound to each other and both needs to be accessed by ti-qspi driver (though different targets). Besides qspi_mmap region is only used to read data, there will not be any write accesses to this target. Are you saying this binding is not ...
[PATCH v4 5/5] ARM: dts: AM4372: add entry for qspi mmap region Add qspi memory mapped region entries for AM43xx based SoCs. Also, update the binding documents for the controller to document this change.
use crate::mmap::AsSlice; use crate::volatile_memory::{self, compute_offset, VolatileMemory, VolatileSlice}; @@ -219,8 +221,20 @@ impl Drop for MmapRegion { fn drop(&mut self) { // This is safe because we mmap the area at addr ourselves, and nobody // else is holding a refe...
@@ -460,6 +460,12 @@ _vu_add_mem_reg(VuDev *dev, VhostUserMemoryRegion *msg_region, int fd) DPRINT(" mmap_addr: 0x%016"PRIx64"\n", (uint64_t)(uintptr_t)mmap_addr);#if defined(__linux__) /* Don't include all guest memory in a coredump. */madv...