Hi Johannes, On 01/11/2014 02:10 AM, Johannes Weiner wrote: > Previously, page cache radix tree nodes were freed after reclaim > emptied out their page pointers. But now reclaim stores shadow > entries in their place, which are only reclaimed when the inodes > themselves are reclaimed. This is problematic for bigger files that > are still in use after they have a significant amount of their cache > reclaimed, without any of those pages actually refaulting. The shadow > entries will just sit there and waste memory. In the worst case, the > shadow entries will accumulate until the machine runs out of memory. > I have one more question. It seems that other algorithm only remember history information of a limit number of evicted pages where the number is usually the same as the total cache or memory size. But in your patch, I didn't see a preferred value that how many evicted pages' history information should be recorded. It all depends on the workingset_shadow_shrinker? Thanks, -Bob -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>