On Fri, Feb 26, 2010 at 12:33 PM, Roland McGrath <rol...@redhat.com> wrote: > If you are using actual RHEL5, you can go through your normal support > channels for help on that. I don't know off hand of anybody who wants to > help you with support for using RHEL5 kernel source built with a set of > options different from what RHEL5's own builds use. For kernel developers, > that is a really ancient kernel now. For enterprise support folks, > changing big important config options for rebuilding from the stable old > kernel's source is outside the scope of "stable" and "support".
Fair enough. Thanks for the quick response. For what I'm working on, I really do need the preemptive kernel (I'm generating a few thousand different live video streams, so latency=glitches, and preempt measurably helps.) Which, as you say, pretty much pushes me outside of the supportable envelope unless we track the bleeding edge, which is not a good idea for our setup. But I'm happy to have tracked it down to the utrace-based ptrace emulation, and was mostly just interested in knowing if preempt and utrace are fundamentally incompatible on x86_64, or something like that. I'll fight through the 2.6.18-164 issues instead, since the ptrace problem doesn't seem to be happening on that version. Thanks, Steve