On Wed 20-07-11 14:55:53, KAMEZAWA Hiroyuki wrote: > On Thu, 14 Jul 2011 17:29:51 +0200 > Michal Hocko <mhocko@xxxxxxx> wrote: > > > memcg_oom_mutex is used to protect memcg OOM path and eventfd interface > > for oom_control. None of the critical sections which it protects sleep > > (eventfd_signal works from atomic context and the rest are simple linked > > list resp. oom_lock atomic operations). > > Mutex is also too heavy weight for those code paths because it triggers > > a lot of scheduling. It also makes makes convoying effects more visible > > when we have a big number of oom killing because we take the lock > > mutliple times during mem_cgroup_handle_oom so we have multiple places > > where many processes can sleep. > > > > Signed-off-by: Michal Hocko <mhocko@xxxxxxx> > > Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Thanks! -- Michal Hocko SUSE Labs SUSE LINUX s.r.o. Lihovarska 1060/12 190 00 Praha 9 Czech Republic -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>