Persistent Memory & Linux

on YouTube ↗01h 05m

" summary

Persistent memory is byte-addressable nonvolatile memory with DRAM-like latency and cost that forces the kernel to handle millions of IOPS, so Linux is adding block drivers, caching targets and user-space APIs rather than pretending it’s just a disk. Upstream pieces: dm-cache in 3.9 and bcache staged aim to speed adoption; testing uses battery‑backed DIMMs or RAM‑backed MTD to emulate devices. Execute‑in‑place exists but is limited (e.g. execute‑in‑place only on s390 dasd and NOR flash), and replication needs explicit app APIs (or the brute‑force “write it twice”) because there’s no interception point.

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" chapters (49)

1. 0:00Introduction
2. 0:15Rick Wheeler
3. 1:05What is Persistent Memory
4. 2:26What does Persistent Memory mean
5. 3:07A great picture
6. 4:06SSD history
7. 4:52Linux block stack
8. 6:40Tuning
9. 7:45Driver choices
10. 8:47Fragmented community
11. 9:47Where are we
12. 11:35Crawl Phase
13. 12:08Challenge
14. 13:26Crawl Run
15. 14:06Vendor Specific Parts
16. 16:10Crawl Stage
17. 17:04File Systems
18. 19:57Block Caching
19. 21:49Existing File Systems
20. 23:14ButterFS
21. 28:42Run Phase
22. 33:04Executing Place
23. 33:37How to get stuff into Linux
24. 33:55Linux isnt just a kernel
25. 35:22Break in user space
26. 35:32How do these things come about
27. 36:55Johns work
28. 37:16People in the room
29. 37:34Wrap up
30. 38:23Nonvolatile storage
31. 41:03Generic
32. 41:15VRMs
33. 42:38Block devices
34. 43:51Memory systems
35. 44:02Redundancy
36. 46:14Page
37. 46:43Transparent Replication
38. 48:27Eventually Consistent Replication
39. 49:53My First UNIX Machine
40. 50:42NVME
41. 51:10Persistent Memory
42. 52:32Core Memory
43. 53:05Power Drain
44. 53:58Metadata Cash
45. 54:13Application Programming Level
46. 55:44Failure Characteristics
47. 56:58ECC
48. 57:36Addressability
49. 59:18Longterm challenge