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...
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