>> In old days, we always call drain_all_pages() if did_some_progress!=0. But >> current kernel only call it when get_page_from_freelist() fail. So, >> wait_iff_congested() may help but no guarantee to help us. >> >> If you still strongly worry about IPI cost, I'm concern to move drain_all_pages() >> to more unfrequently point. but to ignore pcp makes less sense, IMHO. >> > > Yes, I'm worried about it because excessive time > spent in drain_all_pages() has come up on the past > http://lkml.org/lkml/2010/8/23/81 . The PCP lists are not being > ignored at the moment. They are drained when direct reclaim makes > forward progress but still fails to allocate a page. Well, it's no priority==0 case. that's my point. -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>