Re: [PATCH RFC] Simplify the Linux kernel by reducing its statespace
From: Eric Dumazet
Date: Sat Mar 31 2012 - 17:00:11 EST
On Sun, 2012-04-01 at 00:33 +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 <paulmck@xxxxxxxxxxxxxxxxxx>
> Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Hmm... I believe you could go one step forward and allow negative values
as well. Antimatter was proven to exist after all.
Hint : nr_cpu_ids is an "int", not an "unsigned int"
Bonus: Existing bugs become "must have" features.
Of course there is no hurry and this can wait 365 days.
To unsubscribe from this list: send the line "unsubscribe linux-alpha" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html