To Memory Management in Linux Memory Management 101 ...
Memory Management 101: Introduction to Memory Management in Linux
Christopher Lameter, Ph.D.
Jump Trading LLC
@qant 1
Overview
Memory and processes Real/Virtual memory and Paging Machine configuration Processes use of memory Overcommit Knobs There is an advanced MM talk tomorrow called
"Flavors of Memory"
2
Pages and physical page frame numbers
Division of memory into "pages"
1-N bytes become split at page size boundaries and become M = N/page size pages
Refer to memory by the Page Frame Number (PFN) and an offset into the page.
Common size is 4k (Intel legacy issues) MMU creates virtual addresses.
Basics of "paging"
Process have virtual memory -> PFN Page Tables Faults
Major Minor
Virtual vs physical
Process memory
Virtual memory maps to physical memory
View of memory that is distinct for each process.
Pages shared Access control Copy on Write
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