Messages in this thread | | | Date | Wed, 29 Mar 2017 02:30:56 +0300 | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCH -mm -v7 1/9] mm, swap: Make swap cluster size same of THP size on x86_64 |
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On Tue, Mar 28, 2017 at 01:32:01PM +0800, Huang, Ying wrote: > From: Huang Ying <ying.huang@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
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