~/talk

io_uring in Android

on YouTube 15m
Talkat Linux Plumbers Conference 2022 · 2022-09-12..09-14· [android]

speaker

name:Akilesh Kailash
links:none on file

resources

video:https://youtu.be/aOpE3q10330
slides:none on file

summary

Android uses io_uring with Q depth 32 to cut snapshot-merge CPU from ~50–55% of operation time to about 10–12%, and Pixel 6 sees an incremental OTA (≈200 MB) merge drop from minutes (often 2–3, sometimes 10–20) to 60–75 seconds. A minimal prototype swaps DM user for a ublk user-space block driver, stacking dm-linear for lifecycle switchover; challenges include driver removal after merge and queuing across the SELinux transition. SQPOLL is explored but may hog a CPU.

AI-written summary · about

chapters (9)

  1. 0:00Introduction to io_uring in Android
  2. 1:06Virtual AB and snapshot merging
  3. 2:53Performance overhead of syscalls
  4. 3:33io_uring benefits for snapshot merge
  5. 4:37DM user and system impact
  6. 6:02Exploring ublk user space block driver
  7. 8:54Challenges with ublk driver
  8. 10:42Advantages of ublk adoption
  9. 11:09Q&A: io_uring adoption gotchas

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