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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
