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SubjectRe: [PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache
On Mon, 22 Dec 2014 12:47:36 -0500
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:

> Hi,
>
> This is the version 5 series of virtio-trace for trace-cmd.
> The previous series is here; https://lkml.org/lkml/2014/7/10/747

Thanks, I'll take a look at this.

I don't think you wanted the cover subject. Also, the date on this
email is still over an hour in the future from this reply.

-- Steve

>
> I took over this work from Yoshihiro Yunomae. This version includes
> some fixes.
> - Add -N support for extract subcommand(1/6).
> - As Steven suggested, this send "-1V2\0<MAGIC>\0" instead
> of "V2\0<MAGIC>\0" at first.
> - Add a document of Protocol change in Documentation/Protocol.txt.
> (Now all the protocol descriptions are moved into that)
> - Cleanup the code and document a bit.
>
> How to use
> ==========
> 1. Run virt-server on a host
> # trace-cmd virt-server --dom guest1 -c 2
>
> 2. Set up of virtio-serial pipe of guest1 on the host
> Add the following tags to domain XML files.
> # virsh edit guest1
> <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/guest1/trace-path-cpu0'/>
> <target type='virtio' name='trace-path-cpu0'/>
> </channel>
> <channel type='pipe'>
> <source path='/tmp/trace-cmd/virt/guest1/trace-path-cpu1'/>
> <target type='virtio' name='trace-path-cpu1'/>
> </channel>
>
> 3. Boot the guest
> # virsh start guest1
>
> 4. Run the guest1's client(see trace-cmd-record(1) with the *--virt* option)
> # trace-cmd record -e sched* --virt
>
> If you want to boot another guest sends trace-data via virtio-serial,
> you will manually make the guest domain directory and trace data I/Fs.
>
> - Make guest domain directory on the host
> # mkdir -p /tmp/trace-cmd/virt/<DOMAIN>
> # chmod 710 /tmp/trace-cmd/virt/<DOMAIN>
> # chgrp qemu /tmp/trace-cmd/virt/<DOMAIN>
>
> - Make FIFO on the host
> # mkfifo /tmp/trace-cmd/virt/<DOMAIN>/trace-path-cpu{0,1,...,X}.{in,out}
>
> TODO
> ====
> - Don't use fixed directory and fifos. Make it flexible.
> - Don't depend on the libvirt. We can find fifos in /proc/<pid>/fd/*.
> - Cleanup the code. It is not well structured now.
>
> Thank you,
>
> ---
>
> Masami Hiramatsu (6):
> trace-cmd: Support -N option for trace-cmd extract
> trace-cmd/listen: Introduce trace-msg protocol (protocol v2)
> trace-cmd/msg: Use poll(2) to wait for a message
> trace-cmd/virt-server: Add virt-server mode for a virtualization environment
> trace-cmd/record: Add --virt option for record mode
> trace-cmd/virt-server: Add --dom option which makes a domain directory to virt-server
>
>
> Documentation/Protocol.txt | 163 +++++
> Documentation/trace-cmd-record.1.txt | 11
> Documentation/trace-cmd-virt-server.1.txt | 113 ++++
> Makefile | 2
> trace-cmd.c | 3
> trace-cmd.h | 15 +
> trace-listen.c | 666 +++++++++++++++++++---
> trace-msg.c | 870 +++++++++++++++++++++++++++++
> trace-msg.h | 31 +
> trace-output.c | 4
> trace-record.c | 160 +++++
> trace-recorder.c | 50 +-
> trace-usage.c | 18 +
> 13 files changed, 1966 insertions(+), 140 deletions(-)
> create mode 100644 Documentation/Protocol.txt
> create mode 100644 Documentation/trace-cmd-virt-server.1.txt
> create mode 100644 trace-msg.c
> create mode 100644 trace-msg.h
>
> --
> Masami HIRAMATSU
> Software Platform Research Dpt. Linux Technology Center
> Hitachi, Ltd., Yokohama Research Laboratory
> E-mail: masami.hiramatsu.pt@hitachi.com



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