On Tue, Oct 27, 2020 at 11:34:11AM +0100, Daniel Wagner wrote:
> It says so, let me double check if those task really run with SCHED_FIFO.
I just got an RCU stall without any background load. Anyway, just for
completeness here is the ps output:
root@c2d:~# ps -eLo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
PID TID CLS RTPRIO NI PRI PSR %CPU STAT WCHAN COMMAND
1 1 TS - 0 19 0 0.0 Ss - systemd
2 2 TS - 0 19 0 0.0 S - kthreadd
3 3 TS - -20 39 0 0.0 I< - rcu_gp
4 4 TS - -20 39 0 0.0 I< - rcu_par_gp
6 6 TS - -20 39 0 0.0 I< - kworker/0:0H-events_highpri
8 8 TS - -20 39 0 0.0 I< - mm_percpu_wq
9 9 TS - 0 19 0 0.0 S - ksoftirqd/0
10 10 FF 1 - 41 0 0.0 S - rcuc/0
11 11 FF 1 - 41 0 0.0 I - rcu_preempt
12 12 FF 1 - 41 0 0.0 S - rcub/0
13 13 FF 99 - 139 0 0.0 S - migration/0
14 14 TS - 0 19 0 0.0 S - cpuhp/0
15 15 TS - 0 19 1 0.0 S - cpuhp/1
16 16 FF 99 - 139 1 0.0 S - migration/1
17 17 FF 1 - 41 1 0.0 R - rcuc/1
18 18 TS - 0 19 1 0.0 R - ksoftirqd/1
19 19 TS - 0 19 1 0.0 I - kworker/1:0-events_freezable_power_
20 20 TS - -20 39 1 0.0 I< - kworker/1:0H-kblockd
21 21 TS - 0 19 1 0.0 S - kdevtmpfs
22 22 TS - -20 39 0 0.0 I< - netns
23 23 TS - 0 19 1 0.0 S - rcu_tasks_kthre
24 24 TS - 0 19 1 0.0 S - rcu_tasks_rude_
25 25 TS - 0 19 0 0.0 S - kauditd
26 26 TS - 0 19 1 0.0 I - kworker/1:1-events_freezable_power_
27 27 TS - 0 19 0 0.0 I - kworker/0:1-ata_sff
28 28 TS - 0 19 1 0.0 S - oom_reaper
29 29 TS - -20 39 1 0.0 I< - writeback
30 30 TS - 0 19 0 0.0 S - kcompactd0
50 50 TS - -20 39 1 0.0 I< - kblockd
51 51 FF 50 - 90 1 0.0 S - irq/9-acpi
52 52 TS - -20 39 1 0.0 I< - ata_sff
53 53 TS - -20 39 0 0.0 I< - md
54 54 TS - -20 39 0 0.0 I< - rpciod
55 55 TS - -20 39 0 0.0 I< - kworker/u9:0-xprtiod
56 56 TS - -20 39 0 0.0 I< - xprtiod
57 57 TS - -20 39 1 0.0 I< - cfg80211
58 58 TS - 0 19 0 0.0 S - kswapd0
59 59 TS - -20 39 1 0.0 I< - nfsiod
61 61 TS - -20 39 1 0.0 I< - acpi_thermal_pm
63 63 FF 50 - 90 0 0.0 S - card0-crtc0
64 64 FF 50 - 90 0 0.0 S - card0-crtc1
65 65 FF 50 - 90 0 0.0 S - irq/16-i915
66 66 TS - -20 39 0 0.0 I< - kworker/0:1H-kblockd
67 67 FF 50 - 90 1 0.0 S - irq/14-ata_piix
68 68 FF 50 - 90 0 0.0 S - irq/15-ata_piix
69 69 TS - 0 19 1 0.0 S - scsi_eh_0
70 70 TS - -20 39 1 0.0 I< - scsi_tmf_0
71 71 TS - 0 19 1 0.0 S - scsi_eh_1
72 72 TS - -20 39 0 0.0 I< - scsi_tmf_1
78 78 FF 50 - 90 1 0.0 S - irq/23-ehci_hcd
79 79 FF 50 - 90 1 0.0 S - irq/23-uhci_hcd
80 80 FF 50 - 90 0 0.0 S - irq/19-uhci_hcd
81 81 FF 50 - 90 1 0.0 S - irq/18-uhci_hcd
82 82 FF 50 - 90 0 0.0 S - irq/16-uhci_hcd
83 83 FF 50 - 90 0 0.0 S - irq/1-i8042
84 84 FF 50 - 90 1 0.0 S - irq/8-rtc0
85 85 FF 50 - 90 0 0.0 S - irq/19-i801_smb
86 86 TS - -20 39 1 0.0 I< - ipv6_addrconf
88 88 TS - 0 19 0 0.2 S - pr/ttyS0
89 89 TS - 0 19 0 0.0 S - pr/netcon0
93 93 TS - -20 39 1 0.0 I< - kworker/1:1H-kblockd
94 94 FF 50 - 90 0 0.0 S - irq/26-eth0
95 95 TS - 0 19 1 0.0 S - scsi_eh_2
96 96 TS - -20 39 1 0.0 I< - scsi_tmf_2
97 97 TS - 0 19 0 0.0 S - usb-storage
105 105 TS - -20 39 1 0.0 I< - kworker/u9:1-xprtiod
106 106 TS - 0 19 0 0.0 S - NFSv4 callback
114 114 TS - 0 19 0 0.0 I - kworker/u8:8-events_unbound
158 158 TS - 0 19 0 0.0 Ss - systemd-journal
167 167 TS - 0 19 0 0.0 Ss - systemd-udevd
175 175 TS - 0 19 0 0.0 Ss - systemd-network
195 195 TS - 0 19 0 0.0 Ssl - systemd-timesyn
195 200 TS - 0 19 0 0.0 Ssl - sd-resolve
224 224 TS - 0 19 0 0.0 Ss - sshd
226 226 TS - 0 19 1 0.0 Ss+ - agetty
227 227 TS - 0 19 0 0.0 Ss+ - agetty
228 228 TS - 0 19 1 0.0 Ss+ - agetty
232 232 TS - 0 19 0 0.0 Ss+ - agetty
233 233 TS - 0 19 1 0.0 Ss+ - agetty
234 234 TS - 0 19 0 0.0 Ss+ - agetty
236 236 TS - 0 19 1 0.0 Ss+ - agetty
241 241 FF 50 - 90 1 0.0 S - irq/4-ttyS0
263 263 TS - 0 19 0 0.0 I - kworker/u8:47-rpciod
266 266 TS - 0 19 1 0.0 R - kworker/1:2+events_freezable_power_
267 267 TS - 0 19 0 0.0 I - kworker/0:0-events_power_efficient
269 269 TS - 0 19 0 0.0 Ss - sshd
275 275 TS - 0 19 0 0.0 Ss - bash
282 282 FF 4 - 44 0 0.0 Sl+ - pi_stress
282 283 FF 1 - 41 1 42.0 Rl+ - pi_stress
282 284 FF 2 - 42 1 22.1 Sl+ - pi_stress
282 285 FF 3 - 43 1 35.7 Rl+ - pi_stress
297 297 TS - 0 19 1 0.0 R - kworker/1:3
303 303 TS - 0 19 0 0.0 I - kworker/0:2-ata_sff
308 308 TS - 0 19 1 0.0 R - kworker/1:4
312 312 TS - 0 19 0 0.0 I - kworker/0:3-ata_sff
316 316 TS - 0 19 0 0.0 I - kworker/u8:0-rpciod
317 317 TS - 0 19 0 0.0 I - kworker/u8:1-rpciod
320 320 TS - 0 19 0 1.0 Ss - sshd
326 326 TS - 0 19 0 0.0 Ss - bash
329 329 TS - 0 19 0 0.0 R+ - ps
