On Tue, 17 Jul 2018 10:12:01 +0200 Michal Hocko <mhocko@xxxxxxxxxx> wrote: > > Any suggestions regarding how the driver developers can test this code > > path? I don't think we presently have a way to fake an oom-killing > > event? Perhaps we should add such a thing, given the problems we're > > having with that feature. > > The simplest way is to wrap an userspace code which uses these notifiers > into a memcg and set the hard limit to hit the oom. This can be done > e.g. after the test faults in all the mmu notifier managed memory and > set the hard limit to something really small. Then we are looking for a > proper process tear down. Chances are, some of the intended audience don't know how to do this and will either have to hunt down a lot of documentation or will just not test it. But we want them to test it, so a little worked step-by-step example would help things along please.
