On 01/10/2014 01:10 PM, Johannes Weiner wrote: > This patch solves one half of the problem by decoupling the ability to > detect working set changes from the inactive list size. By > maintaining a history of recently evicted file pages it can detect > frequently used pages with an arbitrarily small inactive list size, > and subsequently apply pressure on the active list based on actual > demand for cache, not just overall eviction speed. > > Every zone maintains a counter that tracks inactive list aging speed. > When a page is evicted, a snapshot of this counter is stored in the > now-empty page cache radix tree slot. On refault, the minimum access > distance of the page can be assessed, to evaluate whether the page > should be part of the active list or not. > > This fixes the VM's blindness towards working set changes in excess of > the inactive list. And it's the foundation to further improve the > protection ability and reduce the minimum inactive list size of 50%. > > Signed-off-by: Johannes Weiner <han...@cmpxchg.org>
Reviewed-by: Rik van Riel <r...@redhat.com> -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
