On Fri, Sep 09, 2016 at 10:59:32AM +0100, Mel Gorman wrote: > Pages unmapped during reclaim acquire/release the mapping->tree_lock for > every single page. There are two cases when it's likely that pages at the > tail of the LRU share the same mapping -- large amounts of IO to/from a > single file and swapping. This patch acquires the mapping->tree_lock for > multiple page removals. So, once upon a time, in a galaxy far away,.. I did a concurrent pagecache patch set that replaced the tree_lock with a per page bit- spinlock and fine grained locking in the radix tree. I know the mm has changed quite a bit since, but would such an approach still be feasible? I cannot seem to find an online reference to a 'complete' version of that patch set, but I did find the OLS paper on it and I did find some copies on my local machines. -- 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>