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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>I am tracing a user application using lttng kernel tracer, i.e.,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Start lttng kernel trace<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>./application<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Stop lttng kernel trace <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Before I was reading kernel CTF trace using babeltrace API’s from beginning of trace, e.g., <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>struct bt_iter_pos begin_pos<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>struct bt_ctf_iter *iterator<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>begin_pos.type = BT_SEEK_BEGIN<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>iterator = create_iterator(context, &begin_pos, NULL)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>.. and then read events start from that iterator postion.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Recently, I have been trying to seek trace using timestamp from when the application started to application end.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I would like to know if I am doing it right. Would the method below enough to achieve this? Or I am missing something here :-S<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>begin_pos.type = BT_SEEK_TIME<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>end_pos.type = BT_SEEK_TIME<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>begin_pos.u.seek_time = timestamp1 (for now manually taken from CTF kernel trace when application started) <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>end_pos.u.seek_time = timestamp2 (for now manually taken from CTF kernel trace when application ended)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>iterator = create_iterator(context, &begin_pos, &end_pos); <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>and then with reading events at iterator position until end_pos.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I am using babeltrace package version “1.0.0-pre4”.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Any help related to achieving this functionality will be highly appreciated.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Best Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Salman<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>--<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>Salman Rafiq<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>Industrial Communication<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>Fraunhofer-Einrichtung fü</span><span style='font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>r Systeme der Kommunikationstechnik ESK<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>Hansastraße 32 | 80686 München<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>Telefon, Fax: +49 89 547088-356 | +49 89 547088-66-356<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>E-Mail: </span><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:black;mso-fareast-language:DE'><a href="http://www.esk.fraunhofer.de/"><span style='color:blue'>salman.rafiq@esk.fraunhofer.de</span></a></span><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'>Internet: <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:black;mso-fareast-language:DE'><a href="http://www.esk.fraunhofer.de/"><span style='color:blue'>http://www.esk.fraunhofer.de</span></a></span><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:#1F497D;mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Frutiger LT Com 45 Light","sans-serif";color:black;mso-fareast-language:DE'><a href="http://www.facebook.com/FraunhoferESK"><span style='color:blue'>http://www.facebook.com/FraunhoferESK</span></a><br><a href="http://www.twitter.com/FraunhoferESK"><span style='color:blue'>http://www.twitter.com/FraunhoferESK</span></a></span><span style='font-size:9.0pt;color:#1F497D;mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>