On Fri, Sep 03, 2021 at 05:10:31PM +1000, Nicholas Piggin wrote: > Excerpts from Matthew Wilcox's message of September 2, 2021 8:17 pm: > > On Thu, Sep 02, 2021 at 01:25:36PM +1000, Nicholas Piggin wrote: > >> > I have been thinking about this a bit; one of our internal performance > >> > teams flagged the potential performance win to me a few months ago. > >> > I don't have a concrete design for text replication yet; there have been > >> > various attempts over the years, but none were particularly compelling. > >> > >> What was not compelling about it? > > > > It wasn't merged, so clearly it wasn't compelling enough? > > Ha ha. It sounded like you had some reasons you didn't find it > particularly compelling :P I haven't studied it in detail, but it seems to me that your patch (from 2007!) chooses whether to store pages or pcache_desc pointers in i_pages. Was there a reason you chose to do it that way instead of having per-node i_mapping pointers? (And which way would you choose to do it now, given the infrastructure we have now?)
