Implementing paging optimization to avoid populate on page fault during an IO read

摘要

A method and system for implementing paging optimization to avoid populate on page fault during an Input Output (IO) read. A size of the IO read is evaluated. If the IO does not entirely cover a page, then the page is paged in. If the IO entirely covers one or more pages, those pages are not paged in. Page attributes may be different during the IO read. Pages that are paged in are marked readable and writable but pages that are waiting for the IO to populate them are only marked writeable. Once the IO read has completed, the pages are marked readable and writable and all outstanding faults due to reads during this window are completed.

主权项

1. A system for implementing paging optimization to avoid populate on page fault during an Input Output (IO) read comprising:
a processor, said processor determining a size of the IO read; said processor, responsive to the IO entirely covering one or more full pages, and the full pages not being paged in evaluating the page attributes during the IO read; and marking the pages, that are waiting for the IO to populate these pages, only writeable; said processor, marking the page as readable once the IO read has completed and completing all outstanding faults due to reads.