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6d4aea4796
* Removed the vm_cache/vm_store ref_count duality that besides being a bit ugly also created the page dameon cache retrieval problem: now, only areas (and cache consumers) retrieve a reference to the store (and therefore, the vnode). The page daemon doesn't need to care about this at all anymore, and the pseudo references of the vm_cache could be removed again. * Rearranged deletion of vnodes such that its ID can be reused directly after fs_remove_vnode() has been called. * vm_page_allocate_page() no longer panics when it runs out of pages, but just waits for new pages to become available using the new sFreeCondition condition variable - to make sure this happens in an acceptable time frame, it'll trigger a run of the low memory handlers. * Implemented a page_thief() that steals inactive pages from caches and puts them into the free queue. It runs as a low memory handler. * The file cache now sets the usage count on the pages it inserts into the cache (needs some rework though, cache_io() doesn't do it yet). * Instead of panicking, the kernel will currently dead lock in low memory situations, since BFS does a bit too much in bfs_release_vnode(). * Some minor cleanup. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22315 a95241bf-73f2-0310-859d-f6bbb57e9c96