Messages in this thread |  | | | Date | Wed, 4 Feb 2004 21:19:05 -0800 (PST) | | From | Alok Mooley <> | | Subject | Re: Active Memory Defragmentation: Our implementation & problems |
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--- 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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