Re: How to reclaim inode pages on demand

From: Dave Hansen (haveblue_at_us.ibm.com)
Date: 08/10/05

  • Next message: Mel Gorman: "Re: How to reclaim inode pages on demand" 
    To: Mel Gorman <mel@csn.ul.ie>
Date:	Wed, 10 Aug 2005 10:50:25 -0700

    On Wed, 2005-08-10 at 18:27 +0100, Mel Gorman wrote:
    > I later linearly scan the mem_map looking for pages that can be freed up
    > (usually LRU pages). I was expecting any page with PG_inode set to have a
    > page->mapping but not all of them do. It is the pages without a ->mapping
    > that are confusing the hell out of me.

    How about putting a check for PG_inode and a periodic dump_stack()
    wherever page->mapping is cleared? That should at least let you catch
    the culprit who is clearing them. __remove_from_page_cache() is the only
    real place I see this being done.

    Are you remembering to clean PG_inode when a page is freed? Perhaps
    it's allocated for the page cache, reclaimed, returned to the allocator,
    and reallocated as anonymous memory where you're seeing the null
    ->mapping. Might want to check for PG_inode in free_pages_check().

    -- Dave

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