On Sun, Jan 22, 2012 at 12:31:31PM -0800, wangdi wrote: > We actually already implemented this for ext4, and we saw a lot performance improvement(at least 30% improvements for open/create in a single directory)for lustre stack, > but we want to make this improvement accessible through the VFS. Probably XFS and Btrfs could also benefit from this. You do realize that i_mutex locking is relied upon for protection of a lot of stuff besides the obvious (i.e. on-disk directory contents)? I'm not saying that it's hopeless, but it's highly non-trivial; the things like rmdir/mount races, access to ->d_parent/->d_name in a lot of code, etc. need to be taken care of and it is a _lot_ of code review to deal with - just to verify the correctness of such changes. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
