Inspecting and Optimizing Memory Usage in Linux
summary
Examines real measurements on an i.MX93 EVK with 2 GB RAM, showing Linux page structs cost ~64 bytes each (about 32 MB overhead) and using /proc/buddyinfo, /proc/meminfo and smaps to find fragmentation and allocations. Uses smem (PSS/USS), ps, free and valgrind/vmchecker to locate leaks and shows zram and swap tradeoffs plus OOM-killer behavior and oom_score_adj tuning. Demonstrates kernel build pruning that reduced kernel from 32MB to 11MB and recommends targeted config and compiler size flags rather than vague optimizations.
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chapters (11)
- 0:00Memory optimization intro
- 1:05Virtual memory basics
- 5:47NUMA and memory zones
- 11:30Kernel memory analysis
- 17:11User space memory metrics
- 22:18System memory with free
- 24:29Kernel binary optimization
- 26:21Memory leak detection
- 30:21Swap and zram
- 33:14OOM killer tuning
- 35:20Q&A
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