Linux Perf Tools: Overview and Current Developments
summary
Perf now records PEBS-based memory loads with perf mem and shows cache-hierarchy breakdowns (example run: 10µs system-wide, 46% L1 hits), adds interval stat printing (-I) for deltas, and exposes CPU-supported precise levels so using the P modifier picks the best available precision. File comparison gains perf diff weighted, ratio and multi-file modes for baseline comparisons. Group leader sampling (capital S) collapses samples, DWARF-based callchain unwind moves toward elfutils/libdwarf, a perf test suite and menuconfig build system are integrated, and an event-toggle RFC is pending.
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