[lttng-dev] lttng trace format

[Jessica Foest]

Thanks a lot.


2014-02-20 21:28 GMT-05:00 Jérémie Galarneau <jeremie.galarneau at efficios.com
>:

> On Thu, Feb 20, 2014 at 9:15 PM, Jessica Foest <jessica.foest at gmail.com>
> wrote:
> > Hi all
> > is there a document that explain the meaning of fields displayed in the
> > traces generated by babeltrace ?
> >
> >
> > an example :
> >
> > [19:52:06.617756425] (+0.000001667) workstation sys_splice: { cpu_id = 3
> },
> > { perf_branches = 418157709, perf_branch_instructions = 418156946,
> > perf_cache_misses = 6682769, perf_cache_references = 50147680,
> > perf_instructions = 3049323811, vppid = 587, ppid = 587, vtid = 3502,
> tid =
> > 3502, vpid = 3499, nice = 0, prio = 20, procname = "lttng-consumerd",
> pid =
> > 3499 }, { fd_in = 10, off_in = 0x0, fd_out = 26, off_out = 0x0, len =
> 65536,
> > flags = 5 }
> >
> > the field mentioned in blue , is it the execution time of sys_splice ?
> >
>
> Hi Jessica,
>
> It represents the delta between this event and the one before.
>
> For instance, picking two events from a kernel trace on my system...
>
> [21:25:29.901647477] (+0.000001585) XThink power_cpu_idle: { cpu_id =
> 2 }, { state = 4, cpu_id = 2 }
> [21:25:29.901648940] (+0.000001463) XThink sched_stat_sleep: { cpu_id
> = 6 }, { comm = "clementine", tid = 4318, delay = 5158461 }
>
> 901648940 - 901647477 = +0.000001463
>
> Regards,
> Jérémie
>
> > if yes , what's the necessity of sys_exit ?
> > Regards
> >
> > _______________________________________________
> > lttng-dev mailing list
> > lttng-dev at lists.lttng.org
> > http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> >
>
>
>
> --
> Jérémie Galarneau
> EfficiOS Inc.
> http://www.efficios.com
>
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