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From: Steven Rostedt <rostedt@goodmis.org>
To: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Cc: linux-trace-devel@vger.kernel.org
Subject: Re: [PATCH v17 14/18] trace-cmd: Add host trace clock as guest trace argument
Date: Wed, 11 Dec 2019 10:01:00 -0500
Message-ID: <20191211100100.45bb34f8@gandalf.local.home> (raw)
In-Reply-To: <CAPpZLN7bY8=PMwJnB02SRrdxiTRJjE-RwAwnADQBy5oFfhcffQ@mail.gmail.com>

On Wed, 11 Dec 2019 10:21:44 +0200
Tzvetomir Stoyanov <tz.stoyanov@gmail.com> wrote:

> In case of a guest ("-A" option), the logic skips the switch(), so the
> guest args are not parsed.
> There is a check, right before the switch() :

Ah, thanks, I forgot about that.


> 
>         /*
>          * If the current instance is to record a guest, then save
>          * all the arguments for this instance.
>          */
>         if (c != 'B' && c != 'A' && is_guest(ctx->instance)) {
>             add_arg(ctx->instance, c, opts, long_options, optarg);
>             continue;
>         }
> 
> I can put inside that if() a check for "-C" guest argument, but it
> will look like a hack.

I disagree. It's no more of a "hack" than appending a "-C" to the
arguments. I think it's the right solution. We can simply add:

	if (c == 'C')
		ctx->instance->flags |= BUFFER_FL_HAS_CLOCK;

Then we could test if that flag is set for the instance below.

-- Steve

> 
> The confusion is that guest_config is set to true for any "-C" host argument,
> including those for instances, but only the one from the top instance
> is used to inject
> guest clock arg.
> 
> 
> > -- Steve
> >
> >                                 if (is_guest(instance)) {
> >                                         add_argv(instance,
> >                                                  (char *)top_instance.ftrace->clock,
> >                                                  true);
> >                                         add_argv(instance, "-C", true);
> >                                 }
> >                         }
> >                 }
> >         }  
> 
> 
> 


  reply index

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-03 10:35 [PATCH v17 00/18]Timestamp synchronization of host - guest tracing session Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 01/18] trace-cmd: Implement new lib API: tracecmd_local_events_system() Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 02/18] trace-cmd: Add support for negative time offsets in trace.dat file Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 03/18] trace-cmd: Add implementations of htonll() and ntohll() Tzvetomir Stoyanov (VMware)
2019-12-20 13:50   ` Steven Rostedt
2020-01-06 14:30     ` Tzvetomir Stoyanov
2019-12-03 10:35 ` [PATCH v17 04/18] trace-cmd: Add new library APIs for ftrace instances Tzvetomir Stoyanov (VMware)
2019-12-04 16:17   ` Steven Rostedt
2019-12-05 14:40     ` Tzvetomir Stoyanov
2019-12-03 10:35 ` [PATCH v17 05/18] trace-cmd: Add new library API for local CPU count Tzvetomir Stoyanov (VMware)
2019-12-04 20:09   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 06/18] trace-cmd: Add new library API for reading ftrace buffers Tzvetomir Stoyanov (VMware)
2019-12-04 21:10   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 07/18] trace-cmd: Find and store pids of tasks, which run virtual CPUs of given VM Tzvetomir Stoyanov (VMware)
2019-12-04 21:35   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 08/18] trace-cmd: Implement new API tracecmd_add_option_v() Tzvetomir Stoyanov (VMware)
2019-12-04 21:47   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 09/18] trace-cmd: Add new API to generate a unique ID of the tracing session Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 10/18] trace-cmd: Store the session tracing ID in the trace.dat file Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 11/18] trace-cmd: Exchange tracing IDs between host and guest Tzvetomir Stoyanov (VMware)
2019-12-04 22:03   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 12/18] trace-cmd: Implement new option in trace.dat file: TRACECMD_OPTION_TIME_SHIFT Tzvetomir Stoyanov (VMware)
2019-12-05  0:46   ` Steven Rostedt
2019-12-05 15:09     ` Tzvetomir Stoyanov
2019-12-03 10:35 ` [PATCH v17 13/18] trace-cmd: Add guest information in host's trace.dat file Tzvetomir Stoyanov (VMware)
2019-12-05  0:59   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 14/18] trace-cmd: Add host trace clock as guest trace argument Tzvetomir Stoyanov (VMware)
2019-12-09 19:31   ` Steven Rostedt
2019-12-10  8:49     ` Tzvetomir Stoyanov
2019-12-10 15:48       ` Steven Rostedt
2019-12-11  8:21         ` Tzvetomir Stoyanov
2019-12-11 15:01           ` Steven Rostedt [this message]
2019-12-03 10:35 ` [PATCH v17 15/18] trace-cmd: Refactor few trace-cmd internal functions Tzvetomir Stoyanov (VMware)
2019-12-09 19:32   ` Steven Rostedt
2019-12-03 10:35 ` [PATCH v17 16/18] trace-cmd: Basic infrastructure for host - guest timestamp synchronization Tzvetomir Stoyanov (VMware)
2019-12-10 17:04   ` Steven Rostedt
2019-12-10 18:39   ` Steven Rostedt
2019-12-12 12:34     ` Tzvetomir Stoyanov
2019-12-12 14:54       ` Steven Rostedt
2019-12-12 14:00     ` Tzvetomir Stoyanov
2019-12-03 10:35 ` [PATCH v17 17/18] trace-cmd: [POC] PTP-like algorithm " Tzvetomir Stoyanov (VMware)
2019-12-03 10:35 ` [PATCH v17 18/18] trace-cmd: Debug scripts for " Tzvetomir Stoyanov (VMware)

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