Point-in-time copying of virtual storage
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United States of America Patent
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Nov 25, 2014
Issued Date -
N/A
app pub date -
Jun 21, 2011
filing date -
Jun 21, 2011
priority date (Note) -
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Abstract
A method includes making in a real storage, a copy of a first page content stored in a first page data structure by creating a second page content in a second data structure, the second page content pointing to actual data pointed to by the first page content, storing the second page content in the second data structure, marking the first page content in the first page data structure with a page protection bit, wherein the page protection bit prevents a modification of the virtual page, in response to an attempt to modify the virtual page, copying the virtual page in the event the first page content in the first page data structure is marked with the page protection bit, storing the copied virtual page in a second virtual storage, and altering the second page content in the second data structure to point to the stored virtual page.
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