void*__vmalloc_area_node(structvm_struct *area, gfp_t gfp_mask,pgprot_t prot,intnode) { ...for(i =0; i < area->nr_pages; i++) {if(node <0) area->pages[i] =alloc_page(gfp_mask);elsearea->pages[i] = alloc_pages_node(node, gfp_mask,0);//这个0说明是一页一页分配} ....
执行命令rmmod __get_vm_area.ko卸载模块,执行命令dmesg -c,会出现如图所示的结果。结果分析:由传入__get_vm_area( )函数的实参可知,该实例创建一个8192*4大小的内核虚拟区间,该地址区间是按照VM_ALLOC映射方式在0xc0000100和0xdd000000之间的线性地址块中分配的。输出值36864是8192*4加上4096后得到的,在调用...
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),L (link order), O (extra OS processing required), G (group), T (TLS), C (compressed), x (unknown), o (OS specific), E (exclude), p (processor specific) 可以看到每个段的起始地址和占用多大空间,对齐方式...
例如引号内的字段映射为 String，不带引号的映射为数字，日期格式的映射为日期等等，这个机制方便了我们快...
__get_vm_area_node函数的实现有三个步骤: 分配一个struct vm_struct结构 找到一块size大小的vmalloc虚拟地址的区间,这是alloc_vmap_area函数完成的功能 填写struct vm_struct结构 alloc_vmap_area /** Allocate a region of KVA of the specified size andalignment, within the* vstart and vend.*/staticstru...
Linux虚拟化之IOMMU引言1IOMMU初始化1.1 初始化函数集1.2 初始化流程2 Intel-IOMMU2.1 技术原理2.2 数据结构2.3 核心流程2.3.1 intel_iommu_init2.3.2iommu_group_get_for_dev2.3.3 intel_iommu_add_device2.3.4iommu_domain_alloc2.3.5iommu_at Fusion 虚拟化 ...
用于alloc_pages时所使用的标志,这些标志主要用于指定内存域,分配过程是否允许睡眠,是否有IO操作及VFS操作等,此为纯粹操作系统软件层面的标志,与硬件无关 定义在page->flags中的标志,如PG_locked等,此为纯粹操作系统软件层面的标志,与硬件无关; vm_area_struct->vm_flags为vma线性区层面的属性,属于软件层面,它将...
vma = vm_area_alloc(mm); if (!vma) { pr_err("vma allocation failed\n"); return 1; } /* * PFN for mapping at PTE level is determined from a standard kernel * text symbol. But pfns for higher page table levels are derived by ...
Maximum size of class area in Metaspace when compressed class pointers are used share/runtime/globals.hpp ComputeExactFPURegisterUsage OpenJDK6 bool c1 true develop Compute additional live set for fpu registers to simplify fpu stack merge (Intel only) share/c1/c1_globals.hpp ConcGCThreads OpenJDK...
errors will be displayed from the Linux kernel module for the filesystem. Note each line whereEXT4-fsorXFSis specified. For any other filesystem types, the log is in the same area. The filesystem noted in the log entries is determined by the/etc/fstabfile. Take care to verify ...