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    SubjectRe: [PATCH, RFC] hacks to allow -rt to run kernbench on POWER
    On Tue, Oct 30, 2007 at 07:37:50AM +1100, Benjamin Herrenschmidt wrote:
    >
    > 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 :-)

    Works for me!!!

    Thanx, Paul
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