The VMA process
The structvm_operations_struct– operationsstructure handles specific events about a VMA. One of the fields in this structure is struct – operations. When a process tries to access a page that is not in memory and belongs to a valid VMA, that is, it has a valid address; this function is called, if defined, for this VMA. If the nopage function is not defined for this area, the kernel allocates a new page. It is important to note that an address can be covered by a VMA even if the kernel has not yet allocated a page to store it. The Linux kernel performs pagination on demand, that is, a page will only be allocated when the process accesses it.
MOMEMTO creates and manages a process VMA, leaving the others to be managed by the operating system. A process uses the system in the same way as if it were using ammap () for anonymous memory. More precisely, the user requests a new address range; MOMEMTO creates a new memory range and inserts it into the list of process VMAs. In practice, the process will use this memory in the same way as if it had made a call to the mmap () or malloc () functions. MOMEMTO’s memory is allocated on demand. In the event of a page fault, the kernel calls the nopage function to perform the proper handling. When the page fault occurs at an address that belongs to the VMA managed by MOMEMTO, specific treatment is performed for this page.
Each process has several segments of virtual memory in its address space. Normal Linux segments are local to each node. In contrast, MOMEMTO sections are shared between hubs in the bunch. From the application perspective, the common space is seen with a solitary adjacent square of memory. From the framework’s perspective, the mutual portions of every hub are amassed to shape a huge shared fragment, where every hub may have mapped in memory a few pages of the common section, however not really all.
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