Messages in this thread | | | From | Divya Vyas <> | Date | Mon, 22 Dec 2014 12:37:52 +0530 | Subject | Re: Merge ftrace data of host and guest |
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Hi ,
One more thing I want to add that Yoshihiro YUNOMAE's trace-merge script does this time synchronization. We have to calculate guest offset and then subtract with host time .
But it is not applying on current trace-cmd report output format and not giving desired output .
Thanks, Divya Vyas
On Mon, Dec 22, 2014 at 12:34 PM, Divya Vyas <edivya.vyas@gmail.com> wrote: > Hi Steven, > > I am sorry but I am very new to trace-cmd , that's why I didn't knew > what you are working on it. > > I will explain you whole scenario , Actually I have multiple guests > and a host and I want to see all traces on a single file with > trace-cmd report command and may be kernelshark also . > > trace-cmd report -i guest.dat -i host.dat command is giving me all > traces is single file but the timestamp is different for guest . So > the challenge for me is to sync the timestamp of guest and host . Can > you advise me something in this ? How can I sync gettimeofday clocks > of guest and host ? > > and kernelshark doesnt take trace-cmd report input , I think it takes > guest.dat and host.dat . > Is there any other viewer available for ftrace ? > > > > > > > On Sat, Dec 20, 2014 at 10:40 AM, Steven Rostedt <rostedt@goodmis.org> wrote: >> On Fri, Dec 19, 2014 at 05:52:52PM +0530, Divya Vyas wrote: >>> Hi, >> >> Hi, it would be helpful if you Cc'd me. I would have responded quicker. Luckily, >> someone noticed this email and told me about it. >> >>> >>> I think it is not desired output . Ths script is written for diffrent >>> format .ftrace format is ( trace-cmd report command generates) : >> >> I'm actually working on trace-cmd this week and hopefully I'll be able to release >> 2.5 by x-mas. >> >> I believe that Masami is going to start continuing work on the virt guest >> tracer for trace-cmd. >> >> Also, for now, for a crud way of merging, if both the gettimeofday clocks >> of the host and guest are synced, you could do: >> >> guest> trace-cmd record -o guest.dat --date ... >> >> host> trace-cmd record -o host.dat --date ... >> >> and then run: >> >> trace-cmd report -i guest.dat -i host.dat >> >> and trace-cmd will merge the two. The --date will add a way to sync the trace >> timestamps to a wall clock and that will be used to try to interleave the >> events of both the data files. >> >> -- Steve >>
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