Messages in this thread | | | From | Andy Lutomirski <> | Date | Tue, 15 Nov 2011 11:55:48 -0800 | Subject | sysrq-w and sysrq-t useless with cgroups and systemd enabled? |
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For several kernel and Fedora versions now, I've gotten only garbage out of sysrq-w and sysrq-t. The output looks like this:
[432904.642680] rt_rq[0]:/system/home.mount [432904.642681] .rt_nr_running : 0 [432904.642682] .rt_throttled : 0 [432904.642682] .rt_time : 0.000000 [432904.642683] .rt_runtime : 0.000000 [432904.642685] [432904.642685] rt_rq[0]:/system/boot-efi.mount [432904.642686] .rt_nr_running : 0 [432904.642687] .rt_throttled : 0 [432904.642688] .rt_time : 0.000000 [432904.642689] .rt_runtime : 0.000000 [432904.642690] [432904.642690] rt_rq[0]:/system/boot.mount [432904.642691] .rt_nr_running : 0 [432904.642692] .rt_throttled : 0 [432904.642693] .rt_time : 0.000000 [432904.642694] .rt_runtime : 0.000000 [432904.642695] [432904.642695] rt_rq[0]:/system/fsck@.service [432904.642696] .rt_nr_running : 0 [432904.642697] .rt_throttled : 0 [432904.642698] .rt_time : 0.000000 [432904.642699] .rt_runtime : 0.000000 [432904.642700] [432904.642700] rt_rq[0]:/system/cryptsetup@.service [432904.642701] .rt_nr_running : 0 [432904.642702] .rt_throttled : 0 [432904.642703] .rt_time : 0.000000 [432904.642704] .rt_runtime : 0.000000 [432904.642705] [432904.642706] rt_rq[0]:/system/dev-mapper-vg_midnight_ssd\x2dswap.swap [432904.642707] .rt_nr_running : 0 [432904.642708] .rt_throttled : 0 [432904.642708] .rt_time : 0.000000 [432904.642709] .rt_runtime : 0.000000
except that it goes on for pages and pages. I can't find any information about actual hung tasks in the mess (even by searching the log -- I think the interesting information is either not there or is so swamped by log spew that it's actually getting lost by my syslog daemon).
Is this some kind of bad interaction between scheduling groups and the task dumper that's getting exacerbated by the huge number of cgroups that systemd creates?
--Andy
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