On Thu, Mar 06, 2025 at 06:42:10PM +0000, Matthew Wilcox wrote: > On Thu, Mar 06, 2025 at 01:19:41PM -0500, Gregory Price wrote: > > Divorced from the tiering mechanisms, is making misplaced migration able > > to migrate unmapped pages not generally useful? > > The only thing I can think of is if you have a process or set of > processes on node A calling read() and the file is cached on node B. > But in order to decide if the page is on the wrong node, you'd need > to track a lot of information about which nodes the page is being > accessed from. Which is probably why we've never bothered to do it. > > This is not a large patch for you to carry as part of your patchset. > There's nothing intrinsically wrong with it; it just has no users in > mainline and no real prospect of any being added soon. That's fair, I'm just tracking 3-4 different RFCs that are going to butt up against this, so wanted to assess whether getting the patches out ahead would save some strife. ~Gregory
