On Mon, Jan 23, 2012 at 7:20 PM, Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > On Mon, Jan 23, 2012 at 12:47:34AM +0800, Hillf Danton wrote: >> Hi all >> >> For easy review, it is re-prepared based on 3.3-rc1. >> >> Thanks >> Hillf >> >> ===cut please=== >> From: Hillf Danton <dhillf@xxxxxxxxx> >> Subject: [PATCH] mm: vmscan: ensure reclaiming pages on the lru lists of zone >> >> While iterating over memory cgroup hierarchy, pages are reclaimed from each >> mem cgroup, and reclaim terminates after a full round-trip. It is possible >> that no pages on the lru lists of given zone are reclaimed, as termination >> is checked after the reclaiming function. >> >> Mem cgroup iteration is rearranged a bit to make sure that pages are reclaimed >> from both mem cgroups and zone. > > It's not only possible, it's guaranteed: with the memory controller > enabled, the global per-zone lru lists are empty. > > Pages used to be linked on the global per-zone AND the memcg per-zone > lru lists. Nowadays, they only sit on the memcg per-zone lists, which > is why global reclaim does a hierarchy walk. > Thanks for getting me up to date 8-) Hillf -- 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