> > Changes since v1 > - use kerndoc > - be more specific about mem_cgroup_move_parent possible failures > > Signed-off-by: Michal Hocko <mhocko@xxxxxxx> > Reviewed-by: Tejun Heo <tj@xxxxxxxxxx> Reviewed-by: Glauber Costa <glommer@xxxxxxxxxxxxx> > + * move charges to its parent or the root cgroup if the group has no > + * parent (aka use_hierarchy==0). > + * Although this might fail (get_page_unless_zero, isolate_lru_page or > + * mem_cgroup_move_account fails) the failure is always temporary and > + * it signals a race with a page removal/uncharge or migration. In the > + * first case the page is on the way out and it will vanish from the LRU > + * on the next attempt and the call should be retried later. > + * Isolation from the LRU fails only if page has been isolated from > + * the LRU since we looked at it and that usually means either global > + * reclaim or migration going on. The page will either get back to the > + * LRU or vanish. I just wonder for how long can it go in the worst case? -- 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>