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Transparent Hugepages in RHEL 6 Raghu Udiyar 22 July 2011
Transparent Huge Pages ,[object Object]
Merged into upstream kernel 2.6.38
Available in RHEL 6.0 on GA
[object Object]
Memory is divided into pages of equal size Transparent   Huge  Pages Pages Memory
Page :  Memory Management ,[object Object]
For other arch's : ia64 = 8KiB,  ppc64 = 4,8 and 64KiB 4KiB Page x86
Page :  Memory Management Physical Memory ,[object Object]
Programs never work directly with physical memory
A physical page is called a  Page Frame Virtual Memory ,[object Object]
Programs always allocate virtual memory
A virtual page is called simply a  Page
Page :  Virtual and Physical ,[object Object],Physical Virtual Page Page Frame
Page  : Memory Management Process 2 Process 1
Page  : Memory Management ,[object Object]
These page tables are stored in memory
Looking up these page tables is a processes called a
Page Walk
Page  :  Simplified view of the Page Table   Virtual address ,[object Object]
Page  : Memory Management ,[object Object]
Hardware assisted but it is still expensive
Typically, takes 10-100 cpu clock cycles
The obvious optimization is to cache the results

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Transparent Hugepages in RHEL 6