On 08/31/2011 05:08 AM, Johannes Weiner wrote:
Reclaim decides to skip scanning an active list when the corresponding inactive list is above a certain size in comparison to leave the assumed working set alone while there are still enough reclaim candidates around. The memcg implementation of comparing those lists instead reports whether the whole memcg is low on the requested type of inactive pages, considering all nodes and zones. This can lead to an oversized active list not being scanned because of the state of the other lists in the memcg, as well as an active list being scanned while its corresponding inactive list has enough pages. Not only is this wrong, it's also a scalability hazard, because the global memory state over all nodes and zones has to be gathered for each memcg and zone scanned. Make these calculations purely based on the size of the two LRU lists that are actually affected by the outcome of the decision. Signed-off-by: Johannes Weiner<jweiner@xxxxxxxxxx> Cc: Rik van Riel<riel@xxxxxxxxxx> Cc: KOSAKI Motohiro<kosaki.motohiro@xxxxxxxxxxxxxx> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: Daisuke Nishimura<nishimura@xxxxxxxxxxxxxxxxx> Cc: Balbir Singh<bsingharora@xxxxxxxxx>
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