Messages in this thread | | | Date | Sun, 2 Dec 2007 21:45:59 +0100 | From | Ingo Molnar <> | Subject | Re: [BUG] Strange 1-second pauses during Resume-from-RAM |
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* Jörn Engel <joern@logfs.org> wrote:
> > oprofile helps if you can reliably reproduce the slowdown in a loop > > or for a long amount of time, with lots of CPU utilization - and > > then it's also lower overhead. The tracer can be used to capture > > rare or complex events, and gives the full flow control and what is > > happening within the kernel. > > Such a trace would be useful indeed. But so far the patch has only > given me grief and nothing remotely like useful output. Maybe I > should simply use the complete -rt patch instead of debugging the > broken-out latency-tracer patch.
to capture that trace i did not use -rt, i just patched latest -git with:
http://people.redhat.com/mingo/latency-tracing-patches/latency-tracing-v2.6.24-rc3.combo.patch
(this has your fixes included already)
have done:
echo 1 > /proc/sys/kernel/mcount_enabled
and have run:
./trace-cmd sleep 1 > trace.txt
http://people.redhat.com/mingo/latency-tracing-patches/trace-cmd.c
to capture a 1 second trace of what the system is doing. I think your troubles are due to running it within a qemu guest - that is not a typical utilization so you are on unchartered waters.
Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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