Paging i / o . these are i / o operations initiated by the virtual memory system in order to satisfy the needs of the demand paging system 這類是為了滿足“請求頁面調(diào)度系統(tǒng)”的需求而由虛擬內(nèi)存系統(tǒng)發(fā)起的i / o操作。
Shared virtual memory system builds one svm layer over physically distributed memory to form one logically uniform shared virtual space 虛擬共享存儲系統(tǒng)( svm )用軟件的方式在物理分布的存儲器上實現(xiàn)了一個邏輯上統(tǒng)一的虛擬共享存儲空間。
For this reason , there are specific rules used to ensure correct cooperation between file systems ( and file system filter drivers ) and the virtual memory system 正是由于這個原因,有詳細明確的規(guī)則用于保證文件系統(tǒng)(過濾)驅(qū)動程序與虛擬內(nèi)存系統(tǒng)之間正確的協(xié)作。
But it has deficiencies - collection pauses can be long , and the entire heap is visited in the sweep phase , which can have very negative performance consequences on virtual memory systems where the heap may be paged 但是它也有不足收集暫停可能會很長,在清除階段整個堆都是可訪問的,這對于可能有頁面交換的堆的虛擬內(nèi)存系統(tǒng)有非常負面的性能影響。