Fast boot
摘要
說明書
One example of where a secondary may be desired is when handling a set of pages that hold the code of an operating system (e.g., guest operating system). Because the code for the operating system is constant and does not change, it would be inefficient if the processors running the operating system were to fetch pages for the operating system (as this may result in a stall while the processor is waiting for the requested page). Instead, to improve efficiency and reduce stalls, secondaries can be used, where as many pages of the operating system are replicated as possible. By reducing stalls, overhead in the system is also reduced, leading to increased efficiency of the system.
Similar optimizations and efficiencies can be performed for other kinds of programs, such as those with read-only data (where pages of the read-only data are copied as secondaries to read only nodes). In some embodiments, no distinction is made between code pages of an operating system or an application that are read-only pages of memory.
As another example, secondaries can be used that have large amounts of data that do not change very often. If the memory is available to do so, as much of the read-only data can be replicated as possible to improve efficiency and reduce stalls.
3. If p is marked Exclusive on n, the page can only exist on n, there can be no other copies, and the page can be read and written into (“read-write”). In this case, there are no secondaries for p.
