Re: [PATCH] mm: implement WasActive page flag (for improving cleancache)

[Rik van Riel]

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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