Re: Priority Inversion/Inheritance in Linux Kernel

[Rene Herman <rene.herman@xxxxxxxxxxxx>]

On 04-07-08 18:28, Peter Teoh wrote:

> And for the phenomena of "unbounded priority inversion", I found this
> very useful:
>
> http://lkml.org/lkml/2006/5/10/52
>
> Thank you to Rene and Roberto for the discussion.....

Just a final note; note that the above linked document does use a 
slightly different definition of priority inversion then I did.

It already calls the high-prio process blocking because the low-prio 
process is holding a lock "priority inversion" while I in fact sort of 
insist on not doing that -- only call the _medium_ prio process having 
an effectively higher priority than the high-prio process "priority 
inversion".

I do so because if you do it like the linked document you'll have to 
describe priority inversion as "generally not a problem and the expected 
and designed way of things" and this causes confusion. Priority 
inversion is really only ever discussed in the context of it being a 
problem, so let's make sure our definition agrees with that.

But definitions are up for grabs ofcourse and whichever one will do as 
long as you remember the problem scenario...

Rene.

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