Re: Active Memory Defragmentation: Our implementation & problems

[Alok Mooley <rangdi@xxxxxxxxx>]

--- Dave Hansen <haveblue@us.ibm.com> wrote:
> On Wed, 2004-02-04 at 10:54, Alok Mooley wrote:
> > --- Dave Hansen <haveblue@us.ibm.com> wrote:
> Depending on the quantity of work that you're trying
> to do at once, this
> might be unavoidable.  
> 
> I know it's a difficult thing to think about, but I
> still don't
> understand the precise cases that you're concerned
> about.  Page faults
> to me seem like the least of your problems.  A
> bigger issue would be if
> the page is written to by userspace after you copy,
> but before you
> install the new pte.  Did I miss the code in your
> patch that invalidated
> the old tlb entries?

This is a non issue for us right now, since we update
the ptes in a lock, & so no one can access it before
it is completely updated. Yes, we invalidate the old
tlb entries as well as the cache entries as reqd. on
some other architectures.

-Alok


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