Messages in this thread | | | From | Divya Vyas <> | Date | Mon, 22 Dec 2014 12:34:01 +0530 | Subject | Re: Merge ftrace data of host and guest |
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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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