(2012/06/25 23:15), Glauber Costa wrote: > We can use jump labels to patch the code in or out > when not used. > > Because the assignment: memcg->kmem_accounted = true > is done after the jump labels increment, we guarantee > that the root memcg will always be selected until > all call sites are patched (see mem_cgroup_kmem_enabled). > This guarantees that no mischarges are applied. > > Jump label decrement happens when the last reference > count from the memcg dies. This will only happen when > the caches are all dead. > > Signed-off-by: Glauber Costa <glommer@xxxxxxxxxxxxx> > CC: Christoph Lameter <cl@xxxxxxxxx> > CC: Pekka Enberg <penberg@xxxxxxxxxxxxxx> > CC: Michal Hocko <mhocko@xxxxxxx> > CC: Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > CC: Johannes Weiner <hannes@xxxxxxxxxxx> > CC: Suleiman Souhlal <suleiman@xxxxxxxxxx> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
