Bug 215407
| Summary: | ubi: high cpu usage by ubi_bgt with fastmap enabled | ||
|---|---|---|---|
| Product: | File System | Reporter: | Zhihao Cheng (chengzhihao1) |
| Component: | Other | Assignee: | fs_other |
| Status: | NEW --- | ||
| Severity: | normal | ||
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 5.16-rc5 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
a.c
diff.patch a.c v2 diff2 b.c |
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Description
Zhihao Cheng
2021-12-25 08:28:05 UTC
Reproducer (CONFIG_MTD_UBI_FASTMAP): 1. Apply diff.patch(optional, some printing messages) 2. compile and run ./aa top - 12:10:42 up 5 min, 2 users, load average: 1.76, 0.68, 0.27 Tasks: 123 total, 3 running, 54 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.2 us, 27.1 sy, 0.0 ni, 68.9 id, 2.0 wa, 0.0 hi, 0.8 si, 0.0 st KiB Mem : 7450768 total, 7117392 free, 85744 used, 247632 buff/cache KiB Swap: 0 total, 0 free, 0 used. 7055348 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1589 root 20 0 0 0 0 R 45.0 0.0 0:38.86 ubi_bgt0d 319 root 20 0 0 0 0 I 15.2 0.0 0:15.29 kworker/0:3-eve 371 root 20 0 0 0 0 I 14.9 0.0 0:12.85 kworker/3:3-eve 20 root 20 0 0 0 0 I 11.3 0.0 0:05.33 kworker/1:0-eve 202 root 20 0 0 0 0 I 11.3 0.0 0:04.93 kworker/2:3-eve Created attachment 300143 [details]
a.c
Created attachment 300145 [details]
diff.patch
Created attachment 300147 [details]
a.c v2
Created attachment 300837 [details]
diff2
Make sure the old problem(fixed by 4b68bf9a69d2 "ubi: Select fastmap anchor PEBs considering wear level rules") is not imported again.
1. Apply diff2, CONFIG_MTD_UBI_WL_THRESHOLD=50
2. ./bb
3. while true; do ubimkvol -N vol_b -m -n 1 /dev/ubi0; ubirmvol -n1 /dev/ubi0; done
4. ubiscan /dev/mtd0
PEB erase counters
=========================================================
valid : 1024
empty : 0
corrupted: 0
alien : 0
bad : 0
Histogram
=========================================================
from to count min avg max
---------------------------------------------------------
0 .. 9: 0 0 0 0
10 .. 99: 0 0 0 0
100 .. 999: 0 0 0 0
1000 .. 9999: 960 8007 8030 8057
10000 .. 99999: 64 59972 60010 60022
100000 .. inf: 0 0 0 0
---------------------------------------------------------
Total : 1024 8007 11279 60022
Created attachment 300838 [details]
b.c
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