On Tue, Mar 28, 2017 at 01:32:01PM +0800, Huang, Ying wrote: > From: Huang Ying <ying.hu...@intel.com> > > In this patch, the size of the swap cluster is changed to that of the > THP (Transparent Huge Page) on x86_64 architecture (512). This is for > the THP swap support on x86_64. Where one swap cluster will be used to > hold the contents of each THP swapped out. And some information of the > swapped out THP (such as compound map count) will be recorded in the > swap_cluster_info data structure. > > For other architectures which want THP swap support, > ARCH_USES_THP_SWAP_CLUSTER need to be selected in the Kconfig file for > the architecture.
Intreseting case could be architecture with HPAGE_PMD_NR < 256. Can current code pack more than one THP per claster. If not we need to have BUILG_BUG_ON() to catch attempt of such enabling. -- Kirill A. Shutemov
