linux-kernel - Re: [PATCH V2 0/5] trace-cmd: Support the feature recording trace data of guests on the host

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Date:	Mon, 14 Oct 2013 17:26:37 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
Cc:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org, yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH V2 0/5] trace-cmd: Support the feature recording trace
 data of guests on the host

On Fri, 13 Sep 2013 11:06:27 +0900
Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com> wrote:


> <How to use>
> 1. Run virt-server on a host
>    # trace-cmd virt-server
> 
> 2. Make guest domain directory
>    # mkdir -p /tmp/trace-cmd/virt/<domain>
>    # chmod 710 /tmp/trace-cmd/virt/<domain>
>    # chgrp qemu /tmp/trace-cmd/virt/<domain>

Quick comment. I think the above should be done by trace-cmd. At least
have options for it like:

trace-cmd virt-server -d /tmp/trace-cmd/virt/domain -m 710 -g qemu

Perhaps default some of those, and have trace-cmd print out:

  Process Directory:     /tmp/trace-cmd/virt/domain
  Directory permission:  0710
  Group:                 qemu

OK, now to look at the actual code ;-)

-- Steve


> 
> 3. Make FIFO on the host
>    # mkfifo /tmp/trace-cmd/virt/<domain>/trace-path-cpu{0,1,...,X}.{in,out}
> 
> 4. Set up of virtio-serial pipe of a guest on the host
>    Add the following tags to domain XML files.
>    # virsh edit <domain>
>    <channel type='unix'>
>       <source mode='connect' path='/tmp/trace-cmd/virt/agent-ctl-path'/>
>       <target type='virtio' name='agent-ctl-path'/>
>    </channel>
>    <channel type='pipe'>
>       <source path='/tmp/trace-cmd/virt/<domain>/trace-path-cpu0'/>
>       <target type='virtio' name='trace-path-cpu0'/>
>    </channel>
>    ... (cpu1, cpu2, ...)
> 
> 5. Boot the guest
>    # virsh start <domain>
> 
> 6. Execute "record --virt" on the guest
>    # trace-cmd record --virt -e sched*
> 
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