Control the maximum amount of dirty pages a cgroup can have at any given time. Per cgroup dirty limit is like fixing the max amount of dirty (hard to reclaim) page cache used by any cgroup. So, in case of multiple cgroup writers, they will not be able to consume more than their designated share of dirty pages and will be forced to perform write-out if they cross that limit. The overall design is the following: - account dirty pages per cgroup - limit the number of dirty pages via memory.dirty_ratio / memory.dirty_bytes and memory.dirty_background_ratio / memory.dirty_background_bytes in cgroupfs - start to write-out (directly or background) when the cgroup limits are exceeded This feature is supposed to be strictly connected to any underlying IO controller implementation, so we can stop increasing dirty pages in VM layer and enforce a write-out before any cgroup will consume the global amount of dirty pages defined by /proc/sys/vm/dirty_ratio|dirty_bytes and /proc/sys/vm/dirty_background_ratio|dirty_background_bytes. Changelog (v4 -> v5) ~~~~~~~~~~~~~~~~~~~~~~ * fixed a potential deadlock between lock_page_cgroup and mapping->tree_lock (I'm not sure I did the right thing for this point, so review and tests are very welcome) * introduce inc/dec functions to update file cache accounting * export only a restricted subset of mem_cgroup_stat_index flags * fixed a bug in determine_dirtyable_memory() to correctly return the local memcg dirtyable memory * always use global dirty memory settings in calc_period_shift() -Andrea -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>