[libvirt] [PATCH 00/13] Add multiple trace backend function and add new ftrace backend for libvirt

[yangzy.fnst at cn.fujitsu.com]

> [...]
> (For what it's worth, there are several different ways of executing systemtap
> scripts automatically at startup.  There is an initscript.
> With the next version, its docs will move into 'man 8 systemtap', and grows a
> new 'onboot' option, to modules load even earlier at initramfs time via dracut.)
What 'onboot' option it is ?
BTW, do you mean that ftrace backend is not necessary for libvirt now?
Can it generate systemtap script automatically 
and load the module on boot time without users operation?

We think adding multiple trace backends 
can provide more trace interfaces for the upper tool which is based on libvirt.
Developer can chose more compatible trace scheme 
according to the actual situation with more flexibility .

In the ways of usage by common user,
ftrace is more lightweight ,more compact and easier.
After all, writing systemTap script by users themselves 
and making it as an initscript is not convenient for them.

Regards
Yang Zhiyong
> [...]