linux-kernel - Re: Re: Re: [RFC PATCH 0/6] virtio-trace: Support virtio-trace

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Message-ID: <500FB8A4.6060503@hitachi.com>
Date:	Wed, 25 Jul 2012 18:13:08 +0900
From:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
To:	Stefan Hajnoczi <stefanha@...il.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

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.

Thank you,

-- 
Yoshihiro YUNOMAE
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: yoshihiro.yunomae.ez@...achi.com


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