Messages in this thread | ![/](/images/icornerl.gif) | | From | Con Kolivas <> | Subject | Re: [PATCH]O18.1int | Date | Mon, 25 Aug 2003 22:28:37 +1000 |
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On Mon, 25 Aug 2003 21:58, Måns Rullgård wrote: > Con Kolivas <kernel@kolivas.org> writes: > >> >> Vanilla test1 has the spin effect. Test2 doesn't. I haven't tried > >> >> vanilla test3 or test4. As I've said, the O16.2-O16.3 patch > >> >> introduced the problem. With that patch reversed, everything is > >> >> fine. What problem does that patch fix? > >> > > >> > It's a generic fix for priority inversion but it induces badness in > >> > smp, and latency in task preemption on up so it's not suitable. > >> > >> Now I'm confused. If that patch is bad, then why is it in O18? > > > > No, the 16.2 patch is bad. 16.3 backed it out. > > OK, but it somehow made XEmacs behave badly.
Well it was a generic fix in 16.2 that helped XEmacs as I said. O15 also had a generic fix (child not preempting it's parent) but that too was covering up the real issue, but it wasnt as drastic as 16.2.
Con
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