Hello, Here is the v2 patch set for disabling swap_cgroup structures allocation per swapon. In the initial version, one big issue is that I have missed the swap tracking for the root memcg, thanks Michal pointing it out. :) In order to solve it, the easiest approach I can think out is to bypass the root memcg swap accounting during the business and figure it out with some global stats, which means that we always return 0 per root memcg swap charge/uncharge stage, and this is inspired by another proposal from Zhengju: "memcg: Don't account root memcg page statistics -- https://lkml.org/lkml/2013/1/2/71"; Besides that, another major fix is deallocate swap accounting structures on the last non-root memcg remove after all references to it are gone rather than doing it on mem_cgroup_destroy(). Any comment are welcome! v1->v2: - Refactor swap_cgroup_swapon()/swap_cgroup_prepare(), to make the later can be used for allocating buffers per the first non-root memcg creation. - Bypass root memcg swap statistics, using the global stats to figure it out instead. - Export nr_swap_files which would be used when creating/freeing swap_cgroup - Deallocate swap accounting structures on the last non-root memcg removal Old patch set: v1: http://marc.info/?l=linux-mm&m=135461016823964&w=2 Thanks, -Jeff -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>