Re: mm: 5.16 regression: reclaim_throttle leads to stall in near-OOM conditions

From: Alexey Avramov
Date: Wed Nov 24 2021 - 07:47:39 EST

> can you test this?

> diff --git a/mm/vmscan.c b/mm/vmscan.c

Sorry, I didn't notice the diff you provided right away.

Now I've tested it and the result is the same: 1 min stall:

$ mem2log
Starting mem2log with interval 2s, mode: 1
Process memory locked with MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT
All values are in mebibytes
MemTotal: 11798.5, SwapTotal: 0.0
--
MA is MemAvailable, MF is MemFree, A is Anon
F is File, AF is Active(file), IF is Inactive(file)
D is Dirty, C is Clean file (File - Dirty)
SF is SwapFree, SU is SwapUsed (SwapTotal - SwapFree)
--
MA=10402=88% MF=9405 A=844 F=1209 AF=391 IF=818 D=1 C=1208 SF=0 SU=0
MA=10411=88% MF=9414 A=843 F=1209 AF=391 IF=818 D=1 C=1208 SF=0 SU=0
MA=10405=88% MF=9408 A=845 F=1209 AF=392 IF=817 D=1 C=1208 SF=0 SU=0
MA=10390=88% MF=9393 A=863 F=1209 AF=392 IF=817 D=1 C=1208 SF=0 SU=0
MA=10371=88% MF=9374 A=883 F=1209 AF=392 IF=817 D=1 C=1208 SF=0 SU=0
MA=10360=88% MF=9363 A=884 F=1209 AF=392 IF=817 D=0 C=1209 SF=0 SU=0
MA=10338=88% MF=9341 A=892 F=1209 AF=396 IF=813 D=1 C=1208 SF=0 SU=0
MA=10357=88% MF=9359 A=888 F=1209 AF=396 IF=813 D=0 C=1208 SF=0 SU=0
MA=9998=85% MF=9001 A=1245 F=1209 AF=396 IF=813 D=0 C=1209 SF=0 SU=0
MA=6214=53% MF=5217 A=5031 F=1209 AF=396 IF=813 D=0 C=1209 SF=0 SU=0
MA=2410=20% MF=1412 A=8825 F=1209 AF=396 IF=813 D=0 C=1209 SF=0 SU=0
MA=8=0% MF=144 A=11368 F=2 AF=1 IF=1 D=0 C=2 SF=0 SU=0
MA=0=0% MF=126 A=11387 F=2 AF=0 IF=1 D=0 C=2 SF=0 SU=0
MA=0=0% MF=126 A=11387 F=3 AF=1 IF=2 D=0 C=3 SF=0 SU=0
MA=0=0% MF=122 A=11393 F=1 AF=0 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=120 A=11393 F=2 AF=0 IF=2 D=0 C=2 SF=0 SU=0
MA=0=0% MF=121 A=11393 F=3 AF=1 IF=2 D=0 C=3 SF=0 SU=0
MA=0=0% MF=122 A=11395 F=2 AF=0 IF=2 D=0 C=2 SF=0 SU=0
MA=0=0% MF=120 A=11395 F=3 AF=1 IF=2 D=0 C=3 SF=0 SU=0
MA=0=0% MF=120 A=11395 F=4 AF=1 IF=2 D=0 C=4 SF=0 SU=0
MA=0=0% MF=120 A=11395 F=4 AF=1 IF=3 D=0 C=4 SF=0 SU=0
MA=0=0% MF=120 A=11396 F=2 AF=0 IF=2 D=0 C=2 SF=0 SU=0
MA=0=0% MF=120 A=11396 F=2 AF=0 IF=2 D=0 C=2 SF=0 SU=0
MA=0=0% MF=119 A=11396 F=3 AF=1 IF=2 D=0 C=3 SF=0 SU=0
MA=0=0% MF=118 A=11397 F=2 AF=1 IF=1 D=0 C=2 SF=0 SU=0
MA=0=0% MF=122 A=11397 F=3 AF=0 IF=3 D=0 C=3 SF=0 SU=0
MA=0=0% MF=120 A=11397 F=3 AF=0 IF=3 D=0 C=3 SF=0 SU=0
MA=0=0% MF=120 A=11397 F=4 AF=0 IF=4 D=0 C=4 SF=0 SU=0
MA=0=0% MF=119 A=11398 F=3 AF=1 IF=2 D=0 C=3 SF=0 SU=0
MA=0=0% MF=119 A=11400 F=2 AF=1 IF=1 D=0 C=2 SF=0 SU=0
MA=0=0% MF=119 A=11400 F=2 AF=0 IF=2 D=0 C=2 SF=0 SU=0
MA=0=0% MF=120 A=11400 F=2 AF=0 IF=2 D=0 C=2 SF=0 SU=0
MA=0=0% MF=119 A=11400 F=3 AF=1 IF=2 D=0 C=3 SF=0 SU=0
MA=0=0% MF=118 A=11401 F=2 AF=1 IF=1 D=0 C=2 SF=0 SU=0
MA=0=0% MF=118 A=11401 F=1 AF=0 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11401 F=2 AF=1 IF=2 D=0 C=2 SF=0 SU=0
MA=0=0% MF=118 A=11402 F=2 AF=1 IF=1 D=0 C=2 SF=0 SU=0
MA=0=0% MF=119 A=11402 F=1 AF=0 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=119 A=11402 F=1 AF=1 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11402 F=1 AF=1 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11403 F=1 AF=1 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11403 F=1 AF=1 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=117 A=11404 F=1 AF=1 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=117 A=11404 F=1 AF=0 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=1 AF=1 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=0 AF=0 IF=0 D=0 C=0 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=1 AF=0 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=1 AF=0 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=1 AF=1 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=1 AF=0 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=117 A=11404 F=1 AF=1 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=1 AF=0 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=117 A=11404 F=1 AF=0 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=117 A=11404 F=1 AF=0 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=1 AF=1 IF=0 D=0 C=1 SF=0 SU=0
MA=0=0% MF=117 A=11404 F=1 AF=0 IF=1 D=0 C=1 SF=0 SU=0
MA=0=0% MF=118 A=11404 F=1 AF=0 IF=0 D=0 C=1 SF=0 SU=0
MA=1007=9% MF=1145 A=10367 F=1 AF=1 IF=1 D=0 C=1 SF=0 SU=0
MA=10478=89% MF=10608 A=904 F=17 AF=2 IF=15 D=0 C=17 SF=0 SU=0


$ psi2log -m2
Starting psi2log, target: SYSTEM_WIDE, mode: 2, interval: 2 sec, log file is not set, suppress output: False
PSI source dir: /proc/pressure/, source files: cpu, io, memory
Process memory locked with MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT
======|=============|=============|
cpu | io | memory |
----- | ----------- | ----------- |
some | some full | some full | interval
----- | ----- ----- | ----- ----- | --------
0.9 | 0.1 0.1 | 0.0 0.0 | 2.002
1.3 | 0.4 0.3 | 0.0 0.0 | 2.002
1.0 | 0.0 0.0 | 0.0 0.0 | 2.001
0.7 | 1.2 1.1 | 0.0 0.0 | 2.0
0.5 | 2.7 2.6 | 0.0 0.0 | 2.001
1.0 | 2.1 2.0 | 3.1 3.1 | 2.002
0.2 | 89.5 84.6 | 53.6 53.2 | 2.001
0.2 | 85.7 84.0 | 44.4 44.2 | 2.002
0.2 | 95.9 92.5 | 38.6 38.4 | 2.002
0.2 | 72.4 70.8 | 89.2 88.7 | 2.002
0.1 | 89.9 86.9 | 77.4 77.0 | 2.002
0.2 | 87.5 86.8 | 90.2 89.7 | 2.002
0.1 | 87.5 87.0 | 69.3 68.9 | 2.002
0.2 | 92.0 86.6 | 71.0 70.7 | 2.002
0.1 | 87.5 87.0 | 55.1 54.9 | 2.002
0.1 | 85.1 84.5 | 48.0 47.8 | 2.002
0.1 | 87.4 86.8 | 88.2 87.8 | 2.002
0.2 | 87.5 86.9 | 78.1 77.8 | 2.002
0.1 | 95.7 86.9 | 92.8 92.3 | 2.002
0.2 | 88.6 83.9 | 98.9 98.4 | 2.002
0.2 | 98.8 85.5 | 95.6 94.9 | 2.002
0.1 | 100.0 86.9 | 93.6 93.2 | 2.001
0.1 | 95.2 86.9 | 92.4 92.0 | 2.002
0.2 | 87.5 86.8 | 99.9 99.3 | 2.002
0.2 | 92.8 86.1 | 94.7 94.1 | 2.002
0.3 | 93.3 86.6 | 98.0 97.4 | 2.002
0.2 | 84.6 84.1 | 100.0 99.6 | 2.002
0.1 | 87.4 86.8 | 94.0 93.6 | 2.002
0.3 | 87.5 86.7 | 100.0 99.5 | 2.002
0.5 | 81.3 79.8 | 98.3 97.9 | 2.002
0.3 | 88.1 85.3 | 100.0 99.5 | 2.002
0.7 | 84.6 81.1 | 98.9 98.5 | 2.002
0.4 | 70.7 66.0 | 99.3 98.7 | 2.002
0.7 | 64.2 63.1 | 99.1 98.7 | 2.002
0.9 | 48.7 46.8 | 98.8 98.5 | 2.002
0.8 | 36.3 35.2 | 99.7 99.4 | 2.002
0.4 | 16.7 15.9 | 99.5 99.2 | 2.002
0.9 | 2.6 2.5 | 99.7 99.4 | 2.002
1.4 | 3.2 3.1 | 99.6 99.2 | 2.002
0.9 | 12.4 12.1 | 99.3 99.0 | 2.002
1.1 | 27.3 24.7 | 98.9 98.5 | 2.002
0.3 | 2.6 2.6 | 100.0 99.8 | 2.002
1.3 | 10.6 7.6 | 99.7 99.4 | 2.002
0.9 | 18.3 17.5 | 99.2 98.9 | 2.002
1.1 | 34.3 32.1 | 99.7 99.4 | 2.002
1.3 | 34.7 31.8 | 99.8 99.5 | 2.002
0.8 | 0.6 0.6 | 100.0 99.8 | 2.002
1.5 | 0.0 0.0 | 100.0 99.7 | 2.002
1.5 | 0.0 0.0 | 100.0 99.6 | 2.002
1.2 | 0.0 0.0 | 100.0 99.6 | 2.002
0.7 | 0.5 0.5 | 98.6 98.3 | 2.002
1.1 | 0.0 0.0 | 100.0 99.7 | 2.002
1.4 | 1.1 1.1 | 98.1 97.8 | 2.002
1.2 | 0.0 0.0 | 100.0 99.7 | 2.002
0.9 | 0.0 0.0 | 100.0 99.7 | 2.001
1.2 | 0.3 0.3 | 100.0 99.7 | 2.002
0.7 | 1.0 1.0 | 100.0 99.7 | 2.002
1.7 | 0.0 0.0 | 100.0 99.6 | 2.002
1.3 | 2.7 2.5 | 100.0 99.7 | 2.002
1.4 | 1.4 1.4 | 99.5 99.1 | 2.002
1.0 | 0.4 0.4 | 100.0 99.8 | 2.002
1.9 | 0.0 0.0 | 100.0 99.6 | 2.002
1.1 | 0.0 0.0 | 100.0 99.7 | 2.002
1.1 | 0.0 0.0 | 100.0 99.7 | 2.002
0.9 | 0.0 0.0 | 100.0 99.7 | 2.002
0.9 | 0.3 0.3 | 98.5 98.2 | 2.002
1.3 | 0.0 0.0 | 100.0 99.6 | 2.002
0.9 | 0.0 0.0 | 100.0 99.7 | 2.002
1.0 | 0.0 0.0 | 100.0 99.7 | 2.002
0.6 | 85.7 83.4 | 74.0 72.5 | 2.002
0.2 | 100.0 98.8 | 4.3 4.3 | 2.002
0.2 | 100.0 98.4 | 0.0 0.0 | 2.002