Search Patents
  • System and computer program product for dynamically resizing file systems
    Patent number: 8140807
    Abstract: Methods (100), systems (300) and computer program products are disclosed for uninterrupted execution of an application program (110). The method (100) comprises: receiving a write operation call to a native file system from an application program (110) being executed on an operating system; and dynamically allocating (120, 122) free data blocks to the native file system from at least one other file system in a group of file systems until completion of execution of the application program (110) thereby completing the write operation call. The group of file systems is configured to allow sharing of free data blocks amongst the group of file systems.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: March 20, 2012
    Assignee: International Business Machines Corporation
    Inventors: Madhusudanan Kandasamy, Pruthvi Panyam Nataraj, Ranganathan Vidya
  • Selectively mark free frames as unused for cooperative memory over-commitment
    Patent number: 8055876
    Abstract: Disclosed is a computer implemented method, apparatus and computer program product for communicating virtual memory page status to a virtual memory manager. An operating system may receive a request to free a virtual memory page from a first application. The operating system determines whether the virtual memory page is free due to an operating system page replacement. Responsive to a determination that the virtual memory page is free due to the operating system page replacement, the operating system inhibits marking the virtual memory page as unused. Finally, the operating system may insert the virtual memory page on an operating system free list.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: November 8, 2011
    Assignee: International Business Machines Corporation
    Inventors: Matthew D. Fleming, David A. Hepkin
  • Mark page-out pages as critical for cooperative memory over-commitment
    Patent number: 7971027
    Abstract: Disclosed is a computer implemented method and apparatus for marking as critical a virtual memory page in a data processing system. An operating system indicates to a virtual memory manager a virtual memory page selected for paging-out to disk. The operating system determines that the data processing system is using a cooperative memory over-commitment. The operating system, responsive to a determination that the data processing system is using cooperative memory over-commitment, marks the virtual memory page as critical, such that the virtual memory page remains in physical memory. The operating system, responsive to marking the virtual memory page as critical, sets the virtual memory page to a page-out state.
    Type: Grant
    Filed: June 9, 2008
    Date of Patent: June 28, 2011
    Assignee: International Business Machines Corporation
    Inventors: Matthew D. Fleming, David A. Hepkin