Re: vmware strange scheduling priority

[Antonio Vargas]

On Mon, Jun 16, 2003 at 08:39:38PM +0200, Peter Enderborg wrote:
> Im playing with vmware 4.0 workstation. And it do some strange 
> things.
> I start vmware with nice and I got this:
> 26499 pme       19  19 95980  93M 95020 R N    12 32.6 24.8   8:55 
> vmware-vmx
> 26439 pme       19  19  8416 8008  7692 R N     8  3.2  2.0   2:02 
> vmware-vmx
> 26492 pme        6 -10 95980  93M 95020 R <    12  2.6 24.8   0:34 
> vmware-vmx
> 26409 pme       19  19  4900 3916  2484 S N     0  1.0  1.0   0:29 
> vmware
> 26433 pme        5 -10  8416 8008  7692 S <     8  0.5  2.0   0:29 
> vmware-vmx
> 26493 pme        5 -10  8056 7268  6988 S <     0  0.5  1.8   0:20 
> vmware-mks
> 26495 pme        9   0 67672  65M 66888 S       0  0.2 17.4   0:11 
> vmware-vmx
> 
> 
> It have changed the prioority to -10 for some of its own tasks. How 
> can that be done? Its a non suid binary started
> by a normal user. It's very ugly, but Im more intressted in how it 
> can be done.
> The kernel is a 2.4.20.

pure guessing here...
vmware relies on having kernel modules instaled.. perhaps
the do an ioctl to enter the module and then they spin
off some threads with nice -10 from inside?
 
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