Reducing TLB and memory overhead using online superpage promotion (1995) [52 citations — 5 self]
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@INPROCEEDINGS{Romer95reducingtlb,author = {Theodore H. Romer and Wayne H. Ohlrich and Anna R. Karlin and Brian N. Bershad},
title = {Reducing TLB and memory overhead using online superpage promotion},
booktitle = {In Proceedings of the 22nd Annual International Symposium on Computer Architecture},
year = {1995},
pages = {176--187}
}
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Abstract:
Modern microprocessors contain small TLBs that maintain a cache of recently used translations. A TLB's coverage is the sum of the number of bytes mapped by each entry. Applications with working sets larger than the TLB coverage will perform poorly due to high TLB miss rates. Superpages have been proposed as a mechanism for increasing TLB coverage. A superpage is a virtual memory page with size and alignment that are a power of two multiple of the system's basepage size. In this paper, we describe online policies for superpage management that monitor TLB miss traffic to decide when a superpage should be constructed. Our policies take into account both the benefit of a superpage promotion (potential for preventing future misses) and the cost (page copying). Although our approach increases the cost of each TLB miss, the net effect is to improve total execution time by eliminating a large number of misses without significantly increasing memory usage, thereby improving system performance. 1
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