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Message-ID: <CAGfiMvBgwd6A59-4jgcf0qm+bMEz3h-_WOdCJpum3guF8Oe_Eg@mail.gmail.com> Date: Thu, 22 Jan 2015 15:39:23 +0530 From: Divya Vyas <edivya.vyas@...il.com> To: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>, LKML <linux-kernel@...r.kernel.org> Cc: Steven Rostedt <rostedt@...dmis.org>, "yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com> Subject: Re: Merge ftrace data of host and guest Hi, I am working on merge of ftrace data of guest and host . tsc_guest = tsc_host +offset I got offset from /sys/kernel/debug/tracing/instances/tsc_offset/trace 18446739224709377060 Where as my guest and host data is in below format : sshd-2332 [000] 4813.363939: net_dev_queue: dev=eth0 skbaddr=0xffff88003b78f6e8 len=134 sshd-2332 [000] 4813.363951: net_dev_xmit: dev=eth0 skbaddr=0xffff88003b78f6e8 len=134 rc=0 sshd-2332 [000] 4813.364010: netif_receive_skb: dev=eth0 skbaddr=0xffff880015cbbc00 len=52 sshd-2332 [000] 4813.364042: net_dev_queue: dev=eth0 skbaddr=0xffff88002c086ce8 len=102 sshd-2332 [000] 4813.364053: net_dev_xmit: dev=eth0 skbaddr=0xffff88002c086ce8 len=102 rc=0 trace-cmd-2496 [000] 4813.364098: netif_receive_skb: dev=eth0 skbaddr=0xffff880015cbbc00 len=52 <idle>-0 [000] 4814.384570: netif_receive_skb: dev=eth0 skbaddr=0xffff88003a490a00 len=38 <idle>-0 [000] 4816.384541: netif_receive_skb: dev=eth0 skbaddr=0xffff88003a490900 len=38 <idle>-0 [000] 4818.384681: netif_receive_skb: dev=eth0 skbaddr=0xffff88003a490900 len=38 How can I add the timestamp and offset .Do I need to add directly the numbers ? On Tue, Jan 13, 2015 at 11:03 AM, Divya Vyas <edivya.vyas@...il.com> wrote: > Hi, > > Is there any feature in ftrace like synchronizing the timestamp > > http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.linuxtools.lttng.help%2Fdoc%2FTrace-synchronization.html > > > > On Wed, Jan 7, 2015 at 2:57 PM, Divya Vyas <edivya.vyas@...il.com> wrote: >> Hi Masami, >> >> Any updates on the merge feature? >> >> >> >> On Mon, Dec 22, 2014 at 4:36 PM, Divya Vyas <edivya.vyas@...il.com> wrote: >>> Hi Masami, >>> >>> Thanks for the patches . >>> >>> Are you working on this merging feature also >>> https://lkml.org/lkml/2013/12/16/688 ? the d option ? >>> >>> trace-cmd report -i will not give expected output if the time is not >>> synchronized . From kernel side we can get TSC offset using >>> tracepoint when guest boots . I think this tracepoint was added from >>> 3.11 but from user side I got only the trace-merge script which takes >>> offset and trace and host data . But the format of trace data this >>> script accepts is little different . >>> >>> My end goal is to to merge the traces in chronological order and see >>> them in kernelshark . >>> >>> >>> Thanks, >>> Divya >>> >>> >>> >>> >>> >>> On Mon, Dec 22, 2014 at 2:03 PM, Masami Hiramatsu >>> <masami.hiramatsu.pt@...achi.com> wrote: >>>> Hi, >>>> >>>> I'm working on trace-cmd virt-server feature. This is just a basic feature >>>> to allow trace-cmd using virtio-trace (no time synchronizing). >>>> I'll send the updated version of the series soon. >>>> >>>> (2014/12/22 16:07), Divya Vyas wrote: >>>>> 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 . >>>> >>>> Right, to complete this work we need trace-merge like merging feature. >>>> I assume that we can do that by passing the offset of the timestamp >>>> information with guest trace data (that is the simplest implementation). >>>> >>>> However, currently trace-merge depends on x86 TSC, but some intel >>>> processors TSC is not stable. That is current barrier of trace-merge. >>>> >>>> Thank you, >>>> >>>> >>>>> >>>>> 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@...il.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@...dmis.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 >>>>>>> >>>>> >>>> >>>> >>>> -- >>>> Masami HIRAMATSU >>>> Software Platform Research Dept. Linux Technology Research Center >>>> Hitachi, Ltd., Yokohama Research Laboratory >>>> E-mail: masami.hiramatsu.pt@...achi.com >>>> >>>> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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