On Thu 29-11-18 20:21:49, Niklas Hambüchen wrote: > Hello Michal, > > thanks for the swift reply and patch! > > > We batch multiple pages to become really lazyfree. This means that those > > pages are sitting on a per-cpu list (see mark_page_lazyfree). So the > > the number drift depends on the number of CPUs. > > Is there an upper bound that I can rely on in order to judge how far off the accounting is (perhaps depending on the number of CPUs as you say)? > For example, if the drift is bounded to, say 10%, that would probably be fine, while if it could be off by 2x or so, that would make system inspection tough. >From a quick look it should be 15*number_of_cpus unless I have missed other caching. So this shouldn't be all that much unless you have a giant machine with hundreds of cpus. -- Michal Hocko SUSE Labs
