-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 11/03/2014 03:42 PM, j.glisse@xxxxxxxxx wrote: > From: Jérôme Glisse <jglisse@xxxxxxxxxx> > > Motivation: > > Heterogeneous memory management is intended to allow a device to > transparently access a process address space without having to lock > pages of the process or take references on them. In other word > mirroring a process address space while allowing the regular memory > management event such as page reclamation or page migration, to > happen seamlessly. > > Recent years have seen a surge into the number of specialized > devices that are part of a computer platform (from desktop to > phone). So far each of those devices have operated on there own > private address space that is not link or expose to the process > address space that is using them. This separation often leads to > multiple memory copy happening between the device owned memory and > the process memory. This of course is both a waste of cpu cycle and > memory. > > Over the last few years most of those devices have gained a full > mmu allowing them to support multiple page table, page fault and > other features that are found inside cpu mmu. There is now a strong > incentive to start leveraging capabilities of such devices and to > start sharing process address to avoid any unnecessary memory copy > as well as simplifying the programming model of those devices by > sharing an unique and common address space with the process that > use them. > > The aim of the heterogeneous memory management is to provide a > common API that can be use by any such devices in order to mirror > process address. The hmm code provide an unique entry point and > interface itself with the core mm code of the linux kernel avoiding > duplicate implementation and shielding device driver code from core > mm code. Acked-by: Rik van Riel <riel@xxxxxxxxxx> - -- All rights reversed -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAEBAgAGBQJUXTs9AAoJEM553pKExN6DhSYIAI41vr6c/vVdIg2m6Wq3DiSS KtBTUX5/cFmvh9Zd3S422ZwzJQ6ZZLGsNuh2LajLqR0dhDKkwxS7FWFSdifcAfq2 B/Xq8JyeW98Fa0OP0V4uqMuo1FMvlXFZsDijFefxo5F2T/H6XyRI2M+f4w5w9iZa 3EvUaFHoG+mCjoR+ANuxwR9J048wWF626R6CHPOvvIKDNRVr+LADvLMBXmbnrYJs 643mmjhNT+EdPQbxBVszsUbBo/mGicRBuW+t3XkWy1g+hsa4AewhHnOuSHDr13zM YBFjeGP1TbOQxtkiJetsAE4pKxSlJDoscp7vbJjYzLz3Kk2Fag3r1kpSU8S8stI= =ucI+ -----END PGP SIGNATURE----- -- 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>