John Baldwin wrote:
> On 11-Jul-2002 Matthew Dillon wrote:
> >     Here is my proposed fix for the page-zeroing problem w/ SMP.  It
> >     is untested (I'm about to test it)... I'm looking for comments on
> >     the concept.  If the comments are positive and my testing succeeds I
> >     will commit it tonight.
> > 
> >     Basically the idea is simple.  Provide a function that mi_switch() can
> >     call when switching in a thread.  The page zeroing code sets this
> >     function to cpu_invlpg(CADDR3) on switch-in, thus dealing with any
> >     potential switch between cpu's with virtually no overhead (no overhead
> >     that we care about anyway).
> > 
> >     I daresay that this mechanism could be used for a number of other
> >     purposes as well.
> > 
> >     What do you think?
> Sounds fine to me.  I'm not sure it will be all that useful for other
> things in the future but it conveniently solves the problem at hand
> at least.


I've almost completely replaced this code!

I suggested a function for activation a few days ago too, but was going
to leave it till after this commit, which I hoped to get done today.
This reactivates PG_G for SMP and avoids global invltlb's when we can
do finer grained shootdowns.

"All of this is for nothing if we don't go to the stars" - JMS/B5

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