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pmap <pid>
- any line showing ‘anon’ memory is the heap
- page tables are supported directly by the CPU and memory management unit (MMU)
- The page table turns logical memory addresses into real RAM addresses
- The kernel allocates pages
- Pages are allocated and mapped when a program is loaded at run time
- When a program needs more memory, allocate from the heap
- Processes that need a shared library will all reference the same pages for that shared object in memory
- If you don’t have enough memory available, pages are swapped out to disk
- Create swap space with
mkswap
- Start with
swapon
- Any partition with type 82 will be allocated as swap type at boot
/proc/<pid>/smaps
- Detailed information about paging for a process
- ‘/proc/meminfo’
- RSS: Resident set size
- How much virtual memory is in real memory
- Thrashing