On Fri 20-07-18 16:01:25, Andrew Morton wrote: > On Tue, 17 Jul 2018 10:12:01 +0200 Michal Hocko <mhocko at kernel.org> 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. I am willing to give more specific steps. Is anybody interested? From my experience so far this is not something drivers developers using mmu notifiers would be unfamiliar with. -- Michal Hocko SUSE Labs
