I guess what i meant is the "global file list lock". Peter Zijlstra posted a patch in January
2007 but it wasn't accepted. See http://lkml.org/lkml/2007/1/28/29.
Along the lines Ingo Molnar posted some benchmarks: http://lkml.org/lkml/2007/1/28/116 You can
clearly see the improvements. Maybe Peter can start another attempt to get this upstream.