| 1. | Method to get just the reverse mapping keys
方法来获取反向映射键。 |
| 2. | But did not need to use it
的反向映射函数，但是没必要使用它。 |
| 3. | There are also a few other complexities brought about by reverse mappings
反向映射还带来了一些其他的复杂性。 |
| 4. | From large pages to reverse mapping : more reliability and speed
从大内存页到反向映射：更高的稳定性和更快的速度 |
| 5. | Some memory has to be used to keep track of all those reverse mappings
不得不用一些内存来保持对所有那些反向映射的追踪。 |
| 6. | Function checks the existence of a key in the forward and reverse mappings , in that order
函数依次检查正向和反向映射中是否存在某个键。 |
| 7. | Other changes , like reverse mappings , speed up performance in certain critical areas
其他变化，比如反向映射，提高了某些关键领域的性能。 |
| 8. | The most notable and obvious cost of reverse mapping is that it incurs some memory overhead
反向映射最重要、明显的代价是，它带来了一些内存开销。 |
| 9. | Whenever pages are mapped by a process , reverse mappings must be established for all of those pages
当页被一个进程映射时，必须为所有那些页建立反向映射。 |
| 10. | Nothing is free , of course : the performance gains obtained by using reverse mappings come at a price
当然，没有什么是免费的：用反向映射获得性能提高也要付出代价。 |
