Re: priority inversion

Matthew Wilcox (Matthew.Wilcox@genedata.com)
Fri, 30 Jul 1999 01:39:11 +0200

On Thu, Jul 29, 1999 at 11:50:55AM -0600, Jeff Merkey wrote:
>
> Priority Inversion is **BAD BUSINESS**. Someone whould fix whatever this
> person is complaining about. I agree that priority inheritance is slow and
> makes for **FAT** sync object code, but it's either this or throw priorities
> out of the window in the kernel proper since we will see **LOTS** of
> deadlocks and busted applications if an inversion model is what we end up
> with.

Linux has never had a mechanism to deal with priority inversion since
it was first introduced (in 2.0, I believe?). Victor Yodaiken gave an
excellent presentation at Linux Expo about why priority inheritance is
a stupid idea, but that particular section isn't in the Proceedings.
I also can't find it on the rtlinux website. Victor, would you be so
kind as to post a link to it if it exists?

-- 
Matthew Wilcox <willy@bofh.ai>
"Windows and MacOS are products, contrived by engineers in the service of
specific companies. Unix, by contrast, is not so much a product as it is a
painstakingly compiled oral history of the hacker subculture." - N Stephenson


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