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

[Ingo Molnar]

* Lee Revell <rlrevell@xxxxxxxxxxx> 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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