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question about COW

Posted by Demiurg 
question about COW
April 16, 2010 06:38PM
There is an "early COW" mechanism in __do_fault which, if the page was not present and the fault was FAULT_PAGE_WRITE goes ahead and copies the page in order to prevent the next exception.

The question - why the code in __do_fault does not decrease the shared map count of the old page as do_wp_page does ?

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