Hi, All, "Huang, Ying" <ying.huang@xxxxxxxxx> writes: > From: Huang Ying <ying.huang@xxxxxxxxx> > > This patchset is based on 8/4 head of mmotm/master. > > This is the first step for Transparent Huge Page (THP) swap support. > The plan is to delaying splitting THP step by step and avoid splitting > THP finally during THP swapping out and swapping in. > > The advantages of THP swap support are: > > - Batch swap operations for THP to reduce lock acquiring/releasing, > including allocating/freeing swap space, adding/deleting to/from swap > cache, and writing/reading swap space, etc. > > - THP swap space read/write will be 2M sequence IO. It is particularly > helpful for swap read, which usually are 4k random IO. > > - It will help memory fragmentation, especially when THP is heavily used > by the applications. 2M continuous pages will be free up after THP > swapping out. > > As the first step, in this patchset, the splitting huge page is > delayed from almost the first step of swapping out to after allocating > the swap space for THP and adding the THP into swap cache. This will > reduce lock acquiring/releasing for locks used for swap space and swap > cache management. For this patchset posting, In general, I want to check the basic design with memory management subsystem maintainers and developers. For [RFC 01/11] swap: Add swap_cluster_list, it is a cleanup patch. And I think it should be useful independently. I am not very confident about the memcg part, that is [RFC 03/11] mm, memcg: Add swap_cgroup_iter iterator [RFC 04/11] mm, memcg: Support to charge/uncharge multiple swap entries Please help me to check it. Best Regards, Huang, Ying -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>