cancel(reason) {
unsigned long long length(void*data) {
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Virtual memory is conceptually simple but potentially devastating to performance. Every memory access must go through segmentation (add segment base, check limit) and then paging (look up the page table). Naively, paging alone requires two additional memory reads per access -- one for the page directory entry, one for the page table entry.。业内人士推荐搜狗输入法下载作为进阶阅读
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