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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.12-rc3-V0.7.46-01

    * Lee Revell <rlrevell@joe-job.com> wrote:

    > On Fri, 2005-04-22 at 08:27 +0200, Ingo Molnar wrote:
    > > i have released the -V0.7.46-01 Real-Time Preemption patch, which can be
    > > downloaded from the usual place:
    > >
    > > http://redhat.com/~mingo/realtime-preempt/
    >
    > Ingo,
    >
    > With Mingming's patch to resolve the ext3 allocate-with-reservation
    > latency, it looks like we are finally getting close to the lower limit
    > that can be achieved with PREEMPT_DESKTOP. I've attached the trace of
    > the lowest latency over several days of testing with
    > 2.6.12-rc3-RT-V0.7.46-02 + Mingming's patch. It's only 127 usecs, and
    > IIRC you mentioned previously that this code path can't be made
    > preemptible in !PREEMPT_RT.

    yeah, signal delivery will have to stay atomic in !PREEMPT_RT kernels.

    > Since Mingming's patch will have to live in -mm for a while, can it be
    > added to the RT patchset as well?

    i think so - i'll add it to the next patch.

    Ingo

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