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    SubjectRe: [PATCH RFC] Simplify the Linux kernel by reducing its state space
    On Sun, Apr 01, 2012 at 12:04:48PM +0200, Borislav Petkov wrote:
    > On Sun, Apr 01, 2012 at 12:33:21AM +0800, Paul E. McKenney wrote:
    > > Although there have been numerous complaints about the complexity of
    > > parallel programming (especially over the past 5-10 years), the plain
    > > truth is that the incremental complexity of parallel programming over
    > > that of sequential programming is not as large as is commonly believed.
    > > Despite that you might have heard, the mind-numbing complexity of modern
    > > computer systems is not due so much to there being multiple CPUs, but
    > > rather to there being any CPUs at all. In short, for the ultimate in
    > > computer-system simplicity, the optimal choice is NR_CPUS=0.
    > >
    > > This commit therefore limits kernel builds to zero CPUs. This change
    > > has the beneficial side effect of rendering all kernel bugs harmless.
    > > Furthermore, this commit enables additional beneficial changes, for
    > > example, the removal of those parts of the kernel that are not needed
    > > when there are zero CPUs.
    > >
    > > Signed-off-by: Paul E. McKenney <>
    > > Reviewed-by: Thomas Gleixner <>
    > Looks good, thanks for doing that.
    > Btw, I just got confirmation from hw folk that we can actually give you
    > hardware support for that code with an upcoming CPU which has NR_CPUS=0
    > cores.
    > Oh, and additionally, we can disable some of those so getting into the
    > negative is also doable from the hw perspective, so feel free to explore
    > that side of the problem too.
    > ACK.

    Cute! ;-)

    Thanx, Paul

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