Greedy FTL. Jinyong Ha Computer Systems Laboratory Sungkyunkwan University
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1 Greedy FTL Jinyong Ha Computer Systems Laboratory Sungkyunkwan University
2 Contents DRAM Controller FTL Metadata Garbage Collection Power-Off Recovery Greedy FTL ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 2
3 Schedule Date Title 3/11 (Mon) Intro. to the Jasmine OpenSSD Platform 3/18 (Mon) Dummy FTL 3/25 (Mon) Tutorial FTL 4/1 (Mon) Greedy FTL 4/8 (Mon) Reliability Issues 4/15 (Mon) Project #1 4/29 (Mon) Project #1 Q&A, Kernel-Based FTL 5/5 (Mon) Project #2 Suggestions 5/27 (Mon) Project #2 Progress Report 6/10 (Mon) Project #2 Presentation ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 3
4 4 Channel NAND Flash Configuration Channel / Bank (Way) 8 Bank Slot #0 Slot #2 Slot #0 Slot #2 ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 4
5 Plane 0 Plane 1 Die 0 ( Low ) Die 1 ( High ) NAND Flash Memory NAND Flash Organization Total size : 8KB * 128 * 4096 * 2 * 8 = 64GB (page size) (# of pages) (# of blocks) (# of dies)(# of chips) Block Page Buffer Page Buffer ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 5
6 NAND Flash Configuration 2 Plane operation, 16 bit IO program AA 16KB Die 0 (Low) 16KB Die 1 (High) Plane 0 Plane 1 Plane 0 Plane AA.. Block 0 Block 1 Block 0 Block ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 6
7 FTL Metadata Metadata Userdata vs Metadata Types of FTL Metadata Free block count Page-level mapping table Bad block bitmap table Valid page count information ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 7
8 FTL Metadata Considerations Where to locate - SRAM, DRAM, NAND - Performance impact - Metadata size When to store into NAND - Can be reconstructed? ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 8
9 Garbage Collection Select victim block Copy valid pages to free block Erase victim block Victim Free block Free block Valid Valid Invalid Invalid Invalid Invalid Invalid Invalid Invalid Invalid Valid Valid ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 9
10 Greedy FTL./ftl_greedy ftl.c, ftl.h Page Mapping FTL Support simple garbage collection - Victim selection policy : Greedy Support normal power-off recovery ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 10
11 Write Process LPN = LBA / SECTORS_PER_PAGE BANK = LPN % NUM_BANKS VBN 0 bank 0 bank 1. bank 8. VBN VBN n. Write data sequentially from the first block of each bank. ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 11
12 64 MB DRAM Layout 0x Read Buffer Write Buffer Copy Buffer FTL Buffer (For metadata write) HIL Buffer Temp Buffer Bad Block Bitmap Page Map Valid Page Count DRAM ECC Area 64 MB (64 MB / 132 * 128B) ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 12
13 SRAM Metadata./ftl_greedy/ftl.c FTL Metadata ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 13
14 DRAM Metadata./ftl_greedy/ftl.h FTL Metadata ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 14
15 NAND Layout Meta area Data area VBLOCK #0 #1 #2~#31 #n-1 Scan list Firmware... VCOUNT + Misc. metadata PAGE_MAP Host data VPAGE #0 Host data VPAGE #m-1 LPN list To determine valid page ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 15
16 ./ftl_greedy/ftl.c FTL Open ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 16
17 ./ftl_greedy/ftl.h Bad Block Block #0, Page #0 contains bad block list ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 17
18 Read Operation ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 18
19 ./ftl_greedy/ftl.c Write Operation ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 19
20 Write Operation Decrease valid page count Update LPN list Update page mapping table Increase valid page count ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 20
21 Greedy policy Garbage Collection Select victim block which has the maximum invalid pages Free block Victim (VBN #0) LPN list PAGE_MAP VPN 0 0 LPN VPN VPN VPN VPN 3 LPN list Not match! = invalid ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim (jinsookim@skku.edu) 21
22 Garbage Collection./ftl_greedy/ftl.c Using memory utility, search victim block which has the minimum valid page count ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 22
23 Garbage Collection ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 23
24 Any Questions? ICE3028: Embedded Systems Design (Spring 2013) Jin-Soo Kim 24
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