On Mon, Jan 25, 2021 at 11:38:17PM +0200, Mike Rapoport wrote: > I cannot use __GFP_ACCOUNT because cma_alloc() does not use gfp. > Besides, kmem accounting with __GFP_ACCOUNT does not seem > to update stats and there was an explicit request for statistics: > > https://lore.kernel.org/lkml/CALo0P13aq3GsONnZrksZNU9RtfhMsZXGWhK1n=xYJWQizCd4Zw@xxxxxxxxxxxxxx/ > > As for (ab)using NR_SLAB_UNRECLAIMABLE_B, as it was already discussed here: > > https://lore.kernel.org/lkml/20201129172625.GD557259@xxxxxxxxxx/ > > I think that a dedicated stats counter would be too much at the moment and > NR_SLAB_UNRECLAIMABLE_B is the only explicit stat for unreclaimable memory. That's not true -- Mlocked is also unreclaimable. And doesn't this feel more like mlocked memory than unreclaimable slab? It's also Unevictable, so could be counted there instead.
