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

From: Alexey Avramov
Date: Fri Nov 26 2021 - 11:08:52 EST

>Please let me know if this version works any better

It's better, but not the same as 5.15.

Sometimes stall is short, sometimes is long (3 `tail /dev/zero` test):

2021-11-27 00:49:04,977: Starting psi2log, target: SYSTEM_WIDE, mode: 2, interval: 2 sec, log file: /tmpfs/1, suppress output: False
2021-11-27 00:49:04,978: PSI source dir: /proc/pressure/, source files: cpu, io, memory
2021-11-27 00:49:04,981: Process memory locked with MCL_CURRENT | MCL_FUTURE | MCL_ONFAULT
2021-11-27 00:49:04,981: ======|=============|=============|
2021-11-27 00:49:04,981: cpu | io | memory |
2021-11-27 00:49:04,981: ----- | ----------- | ----------- |
2021-11-27 00:49:04,982: some | some full | some full | interval
2021-11-27 00:49:04,982: ----- | ----- ----- | ----- ----- | --------
2021-11-27 00:49:06,984: 1.5 | 8.2 7.8 | 0.0 0.0 | 2.002
2021-11-27 00:49:08,986: 1.4 | 0.8 0.8 | 0.0 0.0 | 2.002
2021-11-27 00:49:10,989: 1.6 | 4.2 3.9 | 0.0 0.0 | 2.003
2021-11-27 00:49:12,991: 1.2 | 2.2 2.1 | 0.0 0.0 | 2.002
2021-11-27 00:49:14,993: 1.0 | 0.6 0.6 | 0.0 0.0 | 2.002
2021-11-27 00:49:16,996: 1.0 | 1.3 1.2 | 0.0 0.0 | 2.002
2021-11-27 00:49:18,997: 2.1 | 0.2 0.1 | 0.0 0.0 | 2.001
2021-11-27 00:49:20,999: 1.0 | 0.6 0.4 | 0.0 0.0 | 2.003
2021-11-27 00:49:23,001: 1.2 | 1.0 0.9 | 0.0 0.0 | 2.001
2021-11-27 00:49:25,003: 0.9 | 0.0 0.0 | 0.0 0.0 | 2.003
2021-11-27 00:49:27,005: 1.0 | 0.1 0.1 | 0.0 0.0 | 2.001
2021-11-27 00:49:29,007: 1.0 | 0.3 0.2 | 0.0 0.0 | 2.002
2021-11-27 00:49:31,009: 0.9 | 2.8 2.1 | 0.0 0.0 | 2.002
2021-11-27 00:49:33,011: 1.0 | 0.1 0.1 | 0.0 0.0 | 2.003
2021-11-27 00:49:35,014: 1.1 | 0.5 0.4 | 0.0 0.0 | 2.002
2021-11-27 00:49:37,016: 1.1 | 2.8 2.6 | 0.0 0.0 | 2.002
2021-11-27 00:49:39,017: 0.8 | 0.1 0.1 | 0.0 0.0 | 2.001
2021-11-27 00:49:41,019: 0.6 | 0.0 0.0 | 0.0 0.0 | 2.002
2021-11-27 00:49:43,021: 1.0 | 0.4 0.2 | 0.0 0.0 | 2.002
2021-11-27 00:49:45,025: 1.2 | 0.4 0.2 | 0.0 0.0 | 2.004
2021-11-27 00:49:47,027: 1.0 | 4.4 4.0 | 0.0 0.0 | 2.002
2021-11-27 00:49:49,029: 0.9 | 0.1 0.1 | 0.0 0.0 | 2.001
2021-11-27 00:49:51,031: 0.9 | 0.2 0.2 | 0.0 0.0 | 2.002
2021-11-27 00:49:53,033: 1.0 | 4.6 3.2 | 0.0 0.0 | 2.002
2021-11-27 00:49:55,035: 0.8 | 0.1 0.1 | 0.0 0.0 | 2.002
2021-11-27 00:49:57,037: 0.7 | 0.0 0.0 | 0.0 0.0 | 2.002
2021-11-27 00:49:59,039: 0.9 | 0.1 0.1 | 0.0 0.0 | 2.002
2021-11-27 00:50:01,041: 0.8 | 0.0 0.0 | 0.0 0.0 | 2.002
2021-11-27 00:50:03,044: 1.0 | 3.3 3.2 | 0.0 0.0 | 2.003
2021-11-27 00:50:05,045: 1.0 | 0.1 0.0 | 0.0 0.0 | 2.001
2021-11-27 00:50:07,047: 0.9 | 0.0 0.0 | 0.0 0.0 | 2.002
2021-11-27 00:50:09,049: 0.9 | 0.4 0.4 | 0.0 0.0 | 2.002
2021-11-27 00:50:11,051: 0.9 | 0.4 0.4 | 0.0 0.0 | 2.002
2021-11-27 00:50:13,053: 0.9 | 0.1 0.1 | 0.0 0.0 | 2.003
2021-11-27 00:50:15,055: 1.1 | 0.4 0.3 | 0.0 0.0 | 2.002
2021-11-27 00:50:17,057: 1.1 | 0.0 0.0 | 0.0 0.0 | 2.002
2021-11-27 00:50:19,059: 0.9 | 6.9 6.0 | 0.0 0.0 | 2.003
2021-11-27 00:50:21,061: 1.1 | 1.5 1.4 | 0.0 0.0 | 2.001
2021-11-27 00:50:23,063: 0.9 | 3.9 3.8 | 0.0 0.0 | 2.002
2021-11-27 00:50:25,065: 0.5 | 0.0 0.0 | 0.0 0.0 | 2.002
2021-11-27 00:50:27,067: 0.4 | 0.0 0.0 | 0.0 0.0 | 2.003
2021-11-27 00:50:29,070: 0.7 | 10.0 8.8 | 8.5 8.4 | 2.003
2021-11-27 00:50:31,072: 0.1 | 89.1 76.4 | 22.6 22.5 | 2.002
2021-11-27 00:50:33,074: 0.3 | 93.6 80.0 | 30.7 30.6 | 2.002
2021-11-27 00:50:35,077: 0.7 | 90.5 76.9 | 67.7 67.3 | 2.002 <-- short stall
2021-11-27 00:50:37,079: 1.0 | 92.6 84.5 | 40.5 40.2 | 2.002
2021-11-27 00:50:39,082: 0.3 | 92.8 91.5 | 0.0 0.0 | 2.003
2021-11-27 00:50:41,084: 1.0 | 93.2 89.3 | 0.0 0.0 | 2.003
2021-11-27 00:50:43,087: 0.7 | 85.4 82.5 | 0.0 0.0 | 2.003
2021-11-27 00:50:45,089: 0.5 | 65.1 62.9 | 0.0 0.0 | 2.002
2021-11-27 00:50:47,091: 0.5 | 57.6 55.6 | 2.4 2.4 | 2.002
2021-11-27 00:50:49,093: 0.1 | 80.2 79.7 | 58.4 58.2 | 2.002
2021-11-27 00:50:51,096: 0.1 | 62.3 54.9 | 83.9 83.4 | 2.002
2021-11-27 00:50:53,096: 0.2 | 53.8 52.9 | 95.2 94.5 | 2.001
2021-11-27 00:50:55,099: 0.2 | 78.4 75.7 | 93.1 92.6 | 2.002
2021-11-27 00:50:57,101: 0.1 | 66.4 64.2 | 97.9 97.4 | 2.002
2021-11-27 00:50:59,103: 0.1 | 70.7 68.2 | 91.7 91.2 | 2.002
2021-11-27 00:51:01,105: 0.2 | 54.5 54.1 | 92.4 91.8 | 2.001
2021-11-27 00:51:03,107: 0.2 | 43.0 42.7 | 94.5 94.1 | 2.002
2021-11-27 00:51:05,109: 0.3 | 26.6 26.0 | 98.0 96.8 | 2.002
2021-11-27 00:51:07,111: 0.5 | 18.3 17.9 | 98.9 97.4 | 2.002
2021-11-27 00:51:09,114: 0.3 | 22.7 22.2 | 97.7 96.9 | 2.002
2021-11-27 00:51:11,116: 0.6 | 21.3 19.9 | 93.7 91.2 | 2.002 <-- medium stall
2021-11-27 00:51:13,117: 0.2 | 98.4 96.4 | 0.9 0.9 | 2.001
2021-11-27 00:51:15,119: 0.2 | 92.9 91.7 | 0.0 0.0 | 2.003
2021-11-27 00:51:17,121: 1.1 | 92.7 88.3 | 0.0 0.0 | 2.001
2021-11-27 00:51:19,123: 0.8 | 81.7 78.3 | 0.0 0.0 | 2.003
2021-11-27 00:51:21,125: 0.6 | 63.8 59.3 | 0.0 0.0 | 2.002
2021-11-27 00:51:23,128: 0.8 | 44.3 37.7 | 1.0 1.0 | 2.002
2021-11-27 00:51:25,130: 0.1 | 79.3 78.7 | 48.8 48.7 | 2.002
2021-11-27 00:51:27,132: 0.1 | 69.7 69.3 | 79.2 79.0 | 2.002
2021-11-27 00:51:29,135: 0.3 | 50.2 45.4 | 80.0 79.7 | 2.002
2021-11-27 00:51:31,136: 0.2 | 69.9 66.8 | 85.1 84.7 | 2.002
2021-11-27 00:51:33,139: 0.2 | 39.4 39.0 | 96.2 95.9 | 2.002
2021-11-27 00:51:35,140: 0.3 | 56.4 52.2 | 94.9 94.5 | 2.002
2021-11-27 00:51:37,143: 0.5 | 27.9 26.7 | 96.9 96.7 | 2.002
2021-11-27 00:51:39,146: 0.6 | 2.1 2.1 | 97.8 97.6 | 2.003
2021-11-27 00:51:41,149: 0.4 | 1.9 1.8 | 96.9 96.7 | 2.003
2021-11-27 00:51:43,151: 0.7 | 0.2 0.2 | 99.7 99.5 | 2.003
2021-11-27 00:51:45,153: 0.6 | 0.0 0.0 | 98.4 98.2 | 2.002
2021-11-27 00:51:47,156: 0.6 | 0.0 0.0 | 97.6 97.5 | 2.002
2021-11-27 00:51:49,159: 0.5 | 0.6 0.6 | 99.2 99.1 | 2.003
2021-11-27 00:51:51,160: 0.6 | 3.3 3.3 | 98.7 98.4 | 2.002
2021-11-27 00:51:53,163: 0.7 | 2.2 2.2 | 96.4 96.2 | 2.002
2021-11-27 00:51:55,165: 0.6 | 0.7 0.6 | 98.5 98.3 | 2.002
2021-11-27 00:51:57,167: 0.6 | 0.0 0.0 | 100.0 99.9 | 2.002
2021-11-27 00:51:59,169: 0.7 | 1.4 1.4 | 99.3 99.2 | 2.002
2021-11-27 00:52:01,172: 0.7 | 1.9 1.8 | 98.4 98.2 | 2.002
2021-11-27 00:52:03,174: 0.9 | 0.0 0.0 | 98.3 98.1 | 2.002
2021-11-27 00:52:05,177: 0.5 | 3.3 3.2 | 99.0 98.8 | 2.003
2021-11-27 00:52:07,179: 0.6 | 2.3 2.3 | 97.8 97.6 | 2.002
2021-11-27 00:52:09,181: 0.8 | 1.8 1.8 | 98.3 98.1 | 2.002
2021-11-27 00:52:11,184: 1.0 | 0.3 0.3 | 98.1 97.9 | 2.003
2021-11-27 00:52:13,187: 1.1 | 0.8 0.8 | 98.3 98.1 | 2.003
2021-11-27 00:52:15,189: 0.8 | 1.3 1.3 | 98.3 98.1 | 2.002
2021-11-27 00:52:17,191: 0.7 | 1.2 1.2 | 96.4 96.2 | 2.002
2021-11-27 00:52:19,194: 1.0 | 0.0 0.0 | 99.0 98.7 | 2.002
2021-11-27 00:52:21,197: 0.7 | 0.6 0.6 | 99.2 99.0 | 2.003
2021-11-27 00:52:23,199: 0.9 | 0.0 0.0 | 100.0 99.8 | 2.003
2021-11-27 00:52:25,202: 0.6 | 2.2 2.1 | 97.0 96.8 | 2.002
2021-11-27 00:52:27,204: 0.9 | 0.7 0.6 | 96.7 96.5 | 2.002
2021-11-27 00:52:29,207: 0.7 | 5.4 5.2 | 98.5 98.3 | 2.003
2021-11-27 00:52:31,209: 0.7 | 13.2 12.4 | 95.8 95.5 | 2.002
2021-11-27 00:52:33,212: 1.0 | 10.5 9.9 | 97.8 97.6 | 2.003
2021-11-27 00:52:35,213: 0.5 | 21.2 20.3 | 96.8 96.5 | 2.001
2021-11-27 00:52:37,215: 0.5 | 1.5 1.5 | 96.9 96.7 | 2.002
2021-11-27 00:52:39,217: 0.9 | 1.7 1.7 | 97.9 97.7 | 2.002
2021-11-27 00:52:41,220: 1.4 | 0.0 0.0 | 100.0 99.7 | 2.002
2021-11-27 00:52:43,222: 0.7 | 0.1 0.1 | 99.0 98.8 | 2.002
2021-11-27 00:52:45,224: 0.6 | 0.2 0.1 | 100.0 99.8 | 2.002
2021-11-27 00:52:47,227: 1.1 | 0.0 0.0 | 99.7 99.4 | 2.002
2021-11-27 00:52:49,229: 0.8 | 0.0 0.0 | 100.0 99.8 | 2.002
2021-11-27 00:52:51,231: 0.7 | 0.0 0.0 | 100.0 99.8 | 2.002
2021-11-27 00:53:13,283: WARNING: abnormal interval (22.052 sec), metrics may be provided incorrect
2021-11-27 00:53:13,283: 0.7 | 12.9 12.6 | 90.5 90.1 | 22.052 <-- long stall
2021-11-27 00:53:15,286: 0.2 | 91.1 88.9 | 6.0 5.9 | 2.003
2021-11-27 00:53:17,288: 0.6 | 91.5 89.2 | 0.0 0.0 | 2.003
2021-11-27 00:53:19,291: 1.2 | 93.4 87.1 | 0.0 0.0 | 2.003
2021-11-27 00:53:21,293: 1.1 | 80.7 74.4 | 0.0 0.0 | 2.002
2021-11-27 00:53:23,295: 1.1 | 76.0 71.0 | 0.0 0.0 | 2.003
2021-11-27 00:53:25,296: 1.0 | 40.0 35.9 | 0.0 0.0 | 2.001
2021-11-27 00:53:27,297: 1.0 | 27.4 25.5 | 0.0 0.0 | 2.0