On Tue, 30 May 2017, Hugh Dickins wrote: > I wanted to try removing CONFIG_SLUB_DEBUG, but didn't succeed in that: > it seemed to be a hard requirement for something, but I didn't find what.
CONFIG_SLUB_DEBUG does not enable debugging. It only includes the code to be able to enable it at runtime. > I did try CONFIG_SLAB=y instead of SLUB: that lowers these allocations to > the expected order:3, which then results in OOM-killing rather than direct > allocation failure, because of the PAGE_ALLOC_COSTLY_ORDER 3 cutoff. But > makes no real difference to the outcome: swapping loads still abort early. SLAB uses order 3 and SLUB order 4??? That needs to be tracked down. Why are the slab allocators used to create slab caches for large object sizes? > Relying on order:3 or order:4 allocations is just too optimistic: ppc64 > with 4k pages would do better not to expect to support a 128TB userspace. I thought you had these huge 64k page sizes?
