[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAJSP0QUJkZrMMU6_OZsX7jCCnikvYmmPKkQui=qsdYxWTz1xCw@mail.gmail.com>
Date: Thu, 26 Jul 2012 11:52:09 +0100
From: Stefan Hajnoczi <stefanha@...il.com>
To: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
linux-kernel@...r.kernel.org,
Herbert Xu <herbert@...dor.apana.org.au>,
Arnd Bergmann <arnd@...db.de>,
Frederic Weisbecker <fweisbec@...il.com>,
yrl.pp-manager.tt@...achi.com, qemu-devel@...gnu.org,
Borislav Petkov <bp@...64.org>,
virtualization@...ts.linux-foundation.org,
"Franch Ch. Eigler" <fche@...hat.com>,
Ingo Molnar <mingo@...hat.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Steven Rostedt <rostedt@...dmis.org>,
Anthony Liguori <anthony@...emonkey.ws>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Amit Shah <amit.shah@...hat.com>,
Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
Dhaval Giani <dhaval.giani@...il.com>
Subject: Re: Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace
On Wed, Jul 25, 2012 at 10:13 AM, Yoshihiro YUNOMAE
<yoshihiro.yunomae.ez@...achi.com> wrote:
> Hi Stefan,
>
>
> (2012/07/24 22:41), Stefan Hajnoczi wrote:
>>
>> On Tue, Jul 24, 2012 at 12:19 PM, Yoshihiro YUNOMAE
>> <yoshihiro.yunomae.ez@...achi.com> wrote:
>>>>>
>>>>> Are you using text formatted ftrace?
>>>
>>> No, currently using raw format, but we'd like to reformat it in text.
>>
>>
>> Capturing the info necessary to translate numbers into symbols is one
>> of the problems of host<->guest tracing so I'm curious how you handle
>> this :).
>
>
> Right, your consideration is true.
>
>
>> Apologies for my lack of ftrace knowledge but how useful is the raw
>> tracing data on the host? How do you pretty-print it in
>> human-readable form?
>
>
> perf and trace-cmd can actually translate raw-formatted trace data to
> text-formatted trace data by using information of kernel or trace
> format under tracing/events directory in debugfs. In the same way, if
> the information of a guest is exported to a host, we can translate
> raw trace data of a guest to text trace data on a host. We will use
> 9pfs to export that.
Thanks, it's clear now :).
Stefan
--
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/
Powered by blists - more mailing lists