On Mon, 2 Mar 2020 19:00:10 +0800 Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx> wrote: > Hi all, > > This patchset mainly includes 3 parts: > 1, some code cleanup and minimum optimization as a preparation. > 2, use TestCleanPageLRU as page isolation's precondition > 3, replace per node lru_lock with per memcg per node lru_lock > > The keypoint of this patchset is moving lru_lock into lruvec, give a > lru_lock for each of lruvec, thus bring a lru_lock for each of memcg > per node. So on a large node machine, each of memcg don't suffer from > per node pgdat->lru_lock waiting. They could go fast with their self > lru_lock now. > > Since lruvec belongs to each memcg, the critical point is to keep > page's memcg stable, so we take PageLRU as its isolation's precondition. > Thanks for Johannes Weiner help and suggestion! > > Following Daniel Jordan's suggestion, I have run 208 'dd' with on 104 > containers on a 2s * 26cores * HT box with a modefied case: > https://git.kernel.org/pub/scm/linux/kernel/git/wfg/vm-scalability.git/tree/case-lru-file-readtwice > > With this patchset, the readtwice performance increased about 80% > in concurrent containers. > > Thanks Hugh Dickins and Konstantin Khlebnikov, they both brought this > idea 8 years ago, and others who give comments as well: Daniel Jordan, > Mel Gorman, Shakeel Butt, Matthew Wilcox etc. > > Thanks for Testing support from Intel 0day and Rong Chen, Fengguang Wu, > and Yun Wang. I'm not seeing a lot of evidence of review and test activity yet. But I think I'll grab patches 01-06 as they look like fairly straightforward improvements.
