On Sun, 13 Jul 2003 17:22:00 -0700 Larry McVoy <lm@bitmover.com> wrote: > Hey, maybe it isn't, but could you please quantify the cost of the VM > operations? How hard is that? Ok. So the page is in a non-uptodate state, NFS would have it locked, and anyone else trying to get at it would sleep. This page we have currently is "dummy" in that it is only a place holder in case we don't get a full page from the networking. We have all the infrastructure to do everything up to this point. Next, if the networking gave us a full page, we'd "replace" the dummy page with this one, which would involve: 1) delete the dummy page from the lookup, insert the networking's page 2) arrange so that all sleepers on the dummy page will do a relookup and find the new page And when we're done with the operation we wake everyone up. I can't see any part of this turning out to be expensive. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
