On Thu 21-09-17 06:38:50, Yang Shi wrote: > Recently we ran into a oom issue, kernel panic due to no killable process. > The dmesg shows huge unreclaimable slabs used almost 100% memory, but kdump > doesn't capture vmcore due to some reason. > > So, it may sound better to capture unreclaimable slab info in oom message > when kernel panic to aid trouble shooting and cover the corner case. > Since kernel already panic, so capturing more information sounds worthy and > doesn't bother normal oom killer. > > With the patchset, tools/vm/slabinfo has a new option, "-U", to show > unreclaimable slab only. > > And, oom will print all non zero (num_objs * size != 0) unreclaimable slabs > in oom killer message.
Well, I do undestand that this _might_ be useful but it also might generates a _lot_ of output. The oom report can be quite verbose already so is this something we want to have enabled by default? -- Michal Hocko SUSE Labs
