Re: Prezeroing V2 [3/4]: Add support for ZEROED and NOT_ZEROED freemaps

[Zwane Mwaikambo]

On Mon, 27 Dec 2004, Ingo Oeser wrote:

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> On Monday 27 December 2004 00:24, Florian Weimer wrote:
> > By the way, some crazy idea that occurred to me: What about
> > incrementally scrubbing a page which has been assigned previously to
> > this CPU, while spinning inside spinlocks (or busy-waiting somewhere
> > else)?
> 
> Crazy idea, indeed. spinlocks are like safety belts: You should
> actually not need them in the normal case, but they will save your butt
> and you'll be glad you have them, when they actually trigger.
> 
> So if you are making serious progress here, you have just uncovered
> a spinlockcontention problem in the kernel ;-)

You'd also be evicting the cache contents thus making the lock contention 
case even worse.
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