Re: Old -rt patches

[John Sigler <linux.kernel@free.fr>]

Paul E. McKenney wrote:

> John Sigler wrote:
>
> > I wrote a Linux app where I need high-resolution timers. I went all the 
> > way and installed the -rt patch, which includes the -hrt patches, as far 
> > as I understand.
> >
> > Since I could not afford to change kernels with every new release, I 
> > decided to track the 2.6.20 branch (arbitrarily).
> >
> > At this point I'm using 2.6.20.7-rt8 (-rt8 was the last patch to the 
> > 2.6.20 branch). (I see 2.6.20 is already up to .15)
> >
> > I see a lot of patches going into the -rt patch, but development moved 
> > on to 2.6.21, then 2.6.22, and now 2.6.23, following mainline.
> >
> > I'm not a kernel hacker, so I don't claim to understand the patches, but 
> > the comments sound like a few bugs are fixed here and there. I can't 
> > tell whether these bugs also exist in previous kernels or only appeared 
> > in newer kernels. Even if I knew, I probably wouldn't have the expertise 
> > to back-port the patch.
> >
> > I'm seeing weird behavior in my app, when it has been running 2-4 days. 
> > The timers start to act out, and all hell breaks loose. Basically, I 
> > have no idea what's going on...
> >
> > My question is: is it possible that there is a bug in 2.6.20-rt8 that 
> > has been fixed in subsequent -rt patches (there's a 2.6.21.6-rt21 and a 
> > 2.6.22.1-rt9)? In other words, if I give 2.6.21.6-rt8 or 2.6.22.1-rt9 a 
> > spin, is it possible that my weird behavior disappears?
> >
> > I'm not saying that it's impossible for the bug to be in my app, but the 
> > app is small enough that I'm fairly confident there's no problem there.
>
> Would you be willing to post your app so people could try to reproduce
> your bug?

Hello Paul,

I cannot provide the app "as is" (I fear the paranoid PHB would 
spontaneously combust). If time permits, I will try to make a small 
testcase to exhibit the problem.

Regards.
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