Linux Kernel Architecture
Virtual Process Memory The virtual address space of userland processes is an important abstraction of Linux: It allows the same ...
Chapter 4: Virtual Process Memory Chapter 4: Virtual Process Memory.......................................... ❑ Thefork-execmode ...
Chapter 4: Virtual Process Memory ❑ The heap where global variables and dynamically generated data are stored. ❑ The stack used ...
Chapter 4: Virtual Process Memory ❑ When a new memory mapping is created, the kernel needs to find a suitable place for it unles ...
Chapter 4: Virtual Process Memory How the text segment is mapped into the virtual address space is determined by the ELF standar ...
Chapter 4: Virtual Process Memory The idea is to limit the maximal stack size to a fixedvalue. Since the stack is bounded, the r ...
Chapter 4: Virtual Process Memory mm->get_unmapped_area = arch_get_unmapped_area_topdown; mm->unmap_area = arch_unmap_area ...
Chapter 4: Virtual Process Memory However, the definition ofarch_pick_mmap_layoutfor the AMD64 architecture shows that another c ...
Chapter 4: Virtual Process Memory 4.3 Principle of Memory Mappings Because the total virtual address space of all user processes ...
Chapter 4: Virtual Process Memory Backing Store Virtual address space Addres space region Physical page frames Not mapped, in us ...
Chapter 4: Virtual Process Memory 4.4.1 Trees and Lists Each region is described by an instance ofvm_area_struct, and the region ...
Chapter 4: Virtual Process Memory 4.4.2 Representation of Regions Each region is represented by an instance ofvm_area_struct, wh ...
Chapter 4: Virtual Process Memory The individual elements have the following meanings: ❑ vm_mmis a back-pointer to themm_structi ...
Chapter 4: Virtual Process Memory ❑ vm_pgoffsetspecifies an offset for a file mapping when not all file contents are to be mappe ...
Chapter 4: Virtual Process Memory Data Structures Every open file (and every block device, because these can also be memory-mapp ...
Chapter 4: Virtual Process Memory priority tree that contains allvm_area_structinstances describing the mapping of an interval o ...
Chapter 4: Virtual Process Memory vm_ area_structinstance. Recall, however, that it is in a union with avm_set. This allows for ...
Chapter 4: Virtual Process Memory 4.5 Operations on Regions The kernel provides various functions to manipulate the regions of a ...
Chapter 4: Virtual Process Memory /* (Cache hit rate is typically around 35%.) */ vma = mm->mmap_cache; if (!(vma && ...
Chapter 4: Virtual Process Memory find_vma_intersectionis another helper function to establish whether an interval bounded bysta ...
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