> On Fri, 14 Jul 2006, Thomas Maier-Komor wrote: > On the level of a physical page (MMU page), there are > reference counters > but there's no way to say "page XXX is referenced Y > times - by the > following apps: A B C ...". Extracting this > information requires walking > all address spaces in the system. A very expensive > operation, as you > noted, but no way around. > > Hence the question, what do you gain if you know that > ? Where/when is it > useful to have this piece of information ?
Given the number of times I've seen users question 'psrstat -a' output on a machine running oracle with a sizeable SGA, I'm sure there's quite a few that would like some way to get at least an approximation of memory in use by some set of multiple processes that took shareing into account. Even if it took a while to run and even if it could never be perfect it would give information that is difficult to produce today. I've tried to post-process pmap output for this purpose a couple of times but didn't feel I could do it correctly. -- Darren This message posted from opensolaris.org _______________________________________________ opensolaris-discuss mailing list opensolaris-discuss@opensolaris.org
