* KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> [2010-08-02 19:13:04]: > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> > > Now, memory cgroup has an ID per cgroup and make use of it at > - hierarchy walk, > - swap recording. > > This patch is for making more use of it. The final purpose is > to replace page_cgroup->mem_cgroup's pointer to an unsigned short. > > This patch caches a pointer of memcg in an array. By this, we > don't have to call css_lookup() which requires radix-hash walk. > This saves some amount of memory footprint at lookup memcg via id. > It is a memory versus speed tradeoff, but if the number of created cgroups is low, it might not be all that slow, besides we do that for swap_cgroup anyway - no? -- Three Cheers, Balbir -- 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>