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SUMMARY:One Bit is Not Enough: The Benefit of Reference Analysis in Virtua
 l Memory Management - Frank Bellosa\, Karlsruhe Institute of Techology
DTSTART:20121128T141500Z
DTEND:20121128T151500Z
UID:TALK39272@talks.cam.ac.uk
CONTACT:Stephen Clark
DESCRIPTION:For half a century operating systems used a single bit to make
 \nplacement and migration decisions for pages of memory.\nThe historic ref
 erence (“use”) bit in the page entry indicates\nif a memory page was u
 sed in the past. Heuristics (e.g.\, clock\nalgorithms) were built upon thi
 s single bit to extract the reference\ncharacteristics supporting higher m
 emory management strategies.\n\nWith the upcoming of heterogeneous memory 
 architectures with\nnon-uniform memory access\, the time has come to rethi
 nk the\ninterface between the memory subsystem and the operating system\nt
 o provide comprehensive memory-reference information that\nguides memory m
 anagement decisions.\nThe talk demonstrates the demand of operating system
 s for information\nabout access frequency\, gap distribution\, and request
  origin to find\nthe best location and access policy for a memory region w
 ith respect\nto latency\, bandwidth\, and energy consumption.\n\n
LOCATION:Lecture Theatre 1\, Computer Laboratory
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