On Wed 21-09-16 11:27:48, Dave Hansen wrote: > On 09/21/2016 11:20 AM, Michal Hocko wrote: > > I would even question the per page block offlining itself. Why would > > anybody want to offline few blocks rather than the whole node? What is > > the usecase here? > > The original reason was so that you could remove a DIMM or a riser card > full of DIMMs, which are certainly a subset of a node.
OK, I see, thanks for the clarification! I was always thinking more in node rather than physical memory range hot-remove. I do agree that it makes sense to free the whole gigantic huge page if we encounter a tail page for the above use case because losing the gigantic page is justified when the whole dim goes away. Thanks! -- Michal Hocko SUSE Labs
