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Subject[PATCH trace-cmd V5 0/6] perf-probe: Bugfix and add new options for cache
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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

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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