Messages in this thread | | | Date | Thu, 26 Jan 2012 22:33:18 -0500 | From | Rik van Riel <> | Subject | Re: [PATCH] mm: implement WasActive page flag (for improving cleancache) |
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On 01/26/2012 09:43 PM, Dan Magenheimer wrote:
> Maybe the Active page bit could be overloaded with some minor > rewriting? IOW, perhaps the Active bit could be ignored when > the page is moved to the inactive LRU? (Confusing I know, but I am > just brainstorming...)
The PG_referenced bit is already overloaded. We keep the bit set when we move a page from the active to the inactive list, so a page that was previously active only needs to be referenced once to become active again.
The LRU bits (PG_lru, PG_active, etc) are needed to figure out which LRU list the page is on. I don't think we can overload those...
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