On 09/30/2012 12:25 PM, Tejun Heo wrote: > On Fri, Sep 28, 2012 at 03:34:19PM +0400, Glauber Costa wrote: >> On 09/27/2012 05:44 PM, Michal Hocko wrote: >>> Anyway, I have just noticed that __mem_cgroup_try_charge does >>> VM_BUG_ON(css_is_removed(&memcg->css)) on a given memcg so you should >>> keep css ref count up as well. >> >> IIRC, css_get will prevent the cgroup directory from being removed. >> Because some allocations are expected to outlive the cgroup, we >> specifically don't want that. > > That synchronous ref draining is going away. Maybe we can do that > before kmemcg? Michal, do you have some timeframe on mind? > Since you said yourself in other points in this thread that you are fine with some page references outliving the cgroup in the case of slab, this is a situation that comes with the code, not a situation that was incidentally there, and we're making use of. -- 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>