{"id":152236,"date":"1997-02-01T00:00:00","date_gmt":"1997-02-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/the-rialto-virtual-memory-system\/"},"modified":"2018-10-16T21:58:08","modified_gmt":"2018-10-17T04:58:08","slug":"the-rialto-virtual-memory-system","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/the-rialto-virtual-memory-system\/","title":{"rendered":"The Rialto Virtual Memory System"},"content":{"rendered":"<div class=\"asset-content\">\n<p>This paper describes the design and implementation of virtual memory in the Rialto kernel. The Rialto VM system supports sparse virtual address spaces with mapping between address spaces, copy-on-write faults, and auto-commit (demand-allocation) faults. It does not currently support demand page-in, page-out, or external pagers. Novel aspects of the design include a VTLB architecture that bounds the memory consumed in machine-dependent mapping structures, real-time requirements for preeemptibility and interruptibility, provision for efficient sharing between user address spaces and the kernel via a user\/kernel address bias, and growable kernel-mode thread stacks. The Rialto kernel is a light-weight, &#8220;soft&#8221; real-time kernel. It has been successfully deployed as part of Microsoft&#8217;s MiTV\/OS for the set-top boxes in the Microsoft\/NTT interactive TV trial in Yokosuka, Japan.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This paper describes the design and implementation of virtual memory in the Rialto kernel. The Rialto VM system supports sparse virtual address spaces with mapping between address spaces, copy-on-write faults, and auto-commit (demand-allocation) faults. It does not currently support demand page-in, page-out, or external pagers. Novel aspects of the design include a VTLB architecture that [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","footnotes":""},"msr-content-type":[3],"msr-research-highlight":[],"research-area":[],"msr-publication-type":[193718],"msr-product-type":[],"msr-focus-area":[],"msr-platform":[],"msr-download-source":[],"msr-locale":[268875],"msr-post-option":[],"msr-field-of-study":[],"msr-conference":[],"msr-journal":[],"msr-impact-theme":[],"msr-pillar":[],"class_list":["post-152236","msr-research-item","type-msr-research-item","status-publish","hentry","msr-locale-en_us"],"msr_publishername":"","msr_edition":"","msr_affiliation":"","msr_published_date":"1997-02-01","msr_host":"","msr_duration":"","msr_version":"","msr_speaker":"","msr_other_contributors":"","msr_booktitle":"","msr_pages_string":"14","msr_chapter":"","msr_isbn":"","msr_journal":"","msr_volume":"","msr_number":"MSR-TR-97-04","msr_editors":"","msr_series":"","msr_issue":"","msr_organization":"","msr_how_published":"","msr_notes":"","msr_highlight_text":"","msr_release_tracker_id":"","msr_original_fields_of_study":"","msr_download_urls":"","msr_external_url":"","msr_secondary_video_url":"","msr_longbiography":"","msr_microsoftintellectualproperty":1,"msr_main_download":"211506","msr_publicationurl":"","msr_doi":"","msr_publication_uploader":[{"type":"file","title":"tr-97-04.pdf","viewUrl":"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2016\/02\/tr-97-04.pdf","id":211506,"label_id":0}],"msr_related_uploader":"","msr_attachments":[{"id":211506,"url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2016\/02\/tr-97-04.pdf"}],"msr-author-ordering":[{"type":"text","value":"Scott M. 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