On Sat, Nov 17, 2012 at 06:56:10AM -0800, Linus Torvalds wrote: > I wonder how we could actually test for it. We'd have to have some > per-cpu page-fault address check (along with a generation count on the > mm or similar). I doubt we'd figure out anything that works reliably > and efficiently and would actually show any problems (plus we would > have no way to ever know we even got the code right, since presumably > we'd never find hardware that actually shows the behavior we'd be > looking for..)
Hmm, touching some wrong page through the stale TLB entry could be a pretty nasty issue to debug. But you're probably right: how does one test cheaply whether a PTE just got kicked out of the TLB? Maybe mark it not-present but this would force a rewalk in the case when it is shared, which is penalty we don't want to pay. Oh well... -- Regards/Gruss, Boris. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
