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    SubjectRe: [PATCH, RFC] hacks to allow -rt to run kernbench on POWER
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    On Mon, 2007-10-29 at 13:26 -0700, Paul E. McKenney wrote:
    >
    > > I see a lot of case where you add preempt_disable/enable around
    > areas
    > > that have the PTE lock held...
    > >
    > > So in -rt, spin_lock doesn't disable preempt ? I'm a bit worried...
    > > there are some strong requirements that anything within that lock is
    > not
    > > preempted, so zap_pte_ranges() is the obvious ones but all of them
    > would
    > > need to be addressed.
    >
    > Right in one! One of the big changes in -rt is that spinlock critical
    > sections (and RCU read-side critical sections, for that matter) are
    > preemptible under CONFIG_PREEMPT_RT.
    >
    > And I agree that this patchset will have missed quite a few places
    > where
    > additional changes are required. Hence the word "including" above,
    > rather
    > than something like "specifically". ;-)

    Ok, well, I'm pretty familiar with that MM code since I wrote a good
    deal of the current version so I'll try to spend some time with your
    patch have a look. It may have to wait for next week though, but feel
    free to ping me if you don't hear back, in case it falls through the
    hole in my brain :-)

    Ben.


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