On Wed, Sep 12, 2007 at 01:27:33AM +1000, Nick Piggin wrote: > > IOWs, we already play these vmap harm-minimisation games in the places > > where we can, but still the overhead is high and something we'd prefer > > to be able to avoid. > > I don't think you've looked nearly far enough with all this low hanging > fruit. Ok, so we need to hack the vm to optimise it further. When it comes to TLB flush code and optimising that sort of stuff, I'm out of my depth. > I just gave 4 things which combined might easily reduce xfs vmap overhead > by several orders of magnitude, all without changing much code at all. Patches would be greatly appreciately. You obviously understand this vm code much better than I do, so if it's easy to fix by adding some generic vmap cache thingy, please do. Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
