[Devel] kernel thread accounted to a VE

[Eric Keller]

Is it possible to start a kernel thread and then move it to a particular 
VE? 

I have the following code inside of a kernel thread:
envid_t _veid = 200;
// enter that VE
unsigned flags = VE_ENTER;
int err = real_env_create(_veid, flags, 0, 0, 0); // the last 3 
arguments are only used if flags is VE_CREATE

I needed to modify ve_move_task() a bit.  It has the following 
assignment:  tsk->mm->vps_dumpable = 0;    But for kernel_threads, 
tsk->mm is NULL, so I just check if it's null and don't do the 
assignment if it is null.  Other than that, it appears to be 
successful.  It returns successful and in the VE I moved the task to, I 
can see a new process running (using top).

The problem is, I set a cpu limit for that VE to 10%, yet I can see this 
thread go well above that amount (~50%).  User processes do get limited 
when I run them, so I know it's not a setting issue (unless there's 
something special I need to do for kernel threads).  Note that I do not 
want to allow the VEs to install kernel modules, so I want the host 
system to do it on their behalf for a very specific circumstance.

Any ideas of what I'm doing wrong or what it'll take to make this work?

Thanks,
Eric