On Wed, 2005-05-04 at 10:22 +0200, Ingo Molnar wrote:
> * Lee Revell <[email protected]> wrote:
> > it looks like we are finally getting close to the lower limit
> > that can be achieved with PREEMPT_DESKTOP ... 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.
>
OK. I found a few more.
When umounting, shrink_dcache_sb() will produce a 3-4 ms. bump. However
it's not clear this can be made preemptible. AFAICT the whole thing
needs to be under the dcache_lock. This one is pretty obvious so I'm
not attaching a trace.
There's also still one path in the VM related to page freeing that can
produce ~500 usec latencies but I don't have a trace handy now.
> > 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.
OK, great.
Lee
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