Christoph Lameter wrote on Wednesday, March 08, 2006 7:33 AM > On Wed, 8 Mar 2006, Robin Holt wrote: > > Are you sure this does not lead to a data integrity issue. What if we > > have a clean writable page. If we get started on the dirty handler and > > the pte gets zapped from under us, the page would not get marked as dirty > > (pte had not gotten updated yet) and the process would continue running. > > No the process would not continue running. The page is not present and > therefore the page fault handler gets involved next to get the page back. > > The page fault handler gets invoked with the write flag set. So it > will bring back the page and mark it dirty. Then it will return to the > process which will perform the write operation. What happens to a scenario where you zap the pte right after dirty bit handler just finished. Won't you lost that "dirty" information? - Ken - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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