Messages in this thread | | | Date | Mon, 28 Jan 2008 11:46:22 -0500 | From | Steven Rostedt <> | Subject | Re: [Regression] 2.6.24-git3: Major annoyance during suspend/hibernation on x86-64 (bisected) |
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Rafael J. Wysocki wrote: > On Monday, 28 of January 2008, Rafael J. Wysocki wrote: >> On Monday, 28 of January 2008, Steven Rostedt wrote: >>> Rafael J. Wysocki wrote: >>> >>>> No, this isn't the WARN_ON(). >>>> >>>>> this does have the feel of being scheduling related, but are you >>>>> absolutely sure about the precise identity of the patch? >>>> Actually, not quite. That's why I have verified it and found that another >>>> patch is really responsible for the issue, namely: >>>> >>>> commit 82a1fcb90287052aabfa235e7ffc693ea003fe69 >>>> Author: Ingo Molnar <mingo@elte.hu> >>>> Date: Fri Jan 25 21:08:02 2008 +0100 >>>> >>>> softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks >>> Are you getting a bunch of prints from the softlockup detector in dmesg? >> No, I don't. In fact, I don't get _any_ messages from it whatsoever. >> >>> I wonder if the detector can detect a long timeout caused by suspend and >>> resume and if not is triggering false positives? >> I'm not sure, but the code is supposed to be suspend-aware, IIRC. However, >> I'm seeing a similar symptom on poweroff on an SMP x86-64 box, so it may be >> more directly related to the CPU hotplug. I'll try to verify that. > > As I expected, the delay is also observable when I do: > > echo 0 > /sys/devices/system/cpu/cpu1/online > > (it's variable, between 3 and 30 seconds). Again, no messages appear in dmesg > when this happens. > > I suspect I'll be able to reproduce it on another x86-64 SMP machine (I'm going > to try that later today).
Could you download my tracing patches from here:
http://people.redhat.com/srostedt/tracing/mcount-tracing-patches-v6.tar.bz2
Apply the above patches and select all but the histogram tracers. Then run this program
http://people.redhat.com/srostedt/tracing/trace-cmd.c
./trace-cmd -f echo 0 > /sys/devices/system/cpu/cpu1/online
then do this (mount debugfs):
bzip2 -c /debugfs/tracing/latency_trace > /tmp/trace.bz2
and send the result to myself and Ingo.
Thanks,
-- Steve
> > Thanks, > Rafael
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