The Resurrection of Ureadahead and Speeding up the Boot Process and Preloading...
summary
Resurrected ureadahead is rewritten to work without kernel patches by switching from custom trace events to uses mm_filemap_add_to_page_cache and libtracefs/trace-cmd, producing pack files that list offsets and blocks rather than embedding data. Chrome OS tests show kernel→login time drops from 7.445s (no pack) to ~6.xs after profiling; recorded page faults fall from ~100k (1.98s of faults) to 90k (0.7s saved). A devel branch and tooling (bootperf, trace-cmd) exist and function on upstream kernels; next steps: split tracer/packer, timestamp-based scheduling and smarter pack rotation.
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chapters (6)
- 0:00Ureadahead introduction
- 12:42How ureadahead works
- 21:50Decline and revival
- 27:59Modernizing with tracing
- 30:46Community collaboration
- 37:51Q&A
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