A case for compiler-driven superpage allocation

Most modern microprocessor-based systems provide support for superpages both at the hardware and software level. Judicious use of superpages can significantly cut down the number of TLB misses and improve overall system performance. However, indiscriminate superpage allocation results in page fragmentation and increased application footprint, which often outweigh the benefits of reduced TLB misses. Previous research has explored policies for smart allocation of superpages from an operating systems perspective. This paper presents a compiler-based strategy for automatic and profitable memory allocation via superpages. A significant advantage of a compiler-based approach is the availability of data-reuse information within an application. Our strategy employs data-locality analysis to estimate the TLB demands of a program and uses this metric to determine if the program will benefit from superpage allocation. Apart from its obvious utility in improving TLB performance, this strateg...

• Type: Conference
• Year: 2009
• Where: ACMSE
• Authors: Joshua Magee, Apan Qasem
• Keywords: ACMSE 2009, Superpage Allocation, Theoretical Computer Science, TLB Demands, TLB Misses