International Business Machines Corporation

William Alan Holder

Damian Leo Osisek

Gustav E Sittmann, Iii

Leslie W Wyman

Janet R Easton

Richard P Tarcza

Bernd Nerz

Lisa Cranton Heller

Hubertus Franke

Martin Schwidefsky

Randall W Philley

Ingo Adlung

Ray Mansell

Jong Hyuk Choi

Gustav E Sittman, Iii

Geoffrey Owen Blandy

Thomas Michael Vail

James Patrick Hennessy

Ronald C Pierson

Donald P Wilton

Randall Philley

Jong Hyuk Ibm Uk Limited Choi

Gustav Sittmann 111

Input/output (I/O) operation requests from pageable storage mode guests are interpreted without host intervention. In a pageable mode virtual environment, requests issued by pageable storage mode guests are processed by one or more processors of the environment absent intervention from one or more hosts of the environment. Processing of the requests includes manipulating, by at least one processor on behalf of the guests, buffer state information stored in host storage. The manipulating is performed via instructions initiated by the guests and processed by one or more of the processors.

Set buffer state instruction

Processing within a computing environment that supports pageable guests is facilitated. Processing is facilitated in many ways, including, but not limited to, associating guest and host state information with guest blocks of storage; maintaining the state information in control blocks in host memory; enabling the changing of states; and using the state information in management decisions. In one particular example, the guest state includes an indication of usefulness and importance of memory contents to the guest, and the host state reflects the ease of access to memory contents. The host and guest state information is used in managing memory of the host and/or guests.

Facilitating processing within computing environments supporting pageable guests

Interpreting I/O operation requests from pageable guests without host intervention

Embodiments of the invention relate to visiting, by a computing device comprising a processor, each guest of a plurality of guests, obtaining, by the computing device, a list of invalidation counts and revalidation counts associated with resources based on the visiting each guest, and calculating, by the computing device, a target size for invalidating resources for each guest based on the list of invalidation counts and revalidation counts.

Resource allocation based on revalidation and invalidation rates

Host page management assist functions are employed to manage storage of a pageable mode virtual environment. These functions enable storage to be managed by a processor of the environment absent intervention of a host of the environment. The functions include a resolve host page function; a pin function; and unpin functions.

Facilitating management of storage of a pageable mode virtual environment absent intervention of a host of the environment

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Vestal, NY, United States of America

William Alan Holder