On Tuesday, January 11, 2011, Joel Becker <jlbec@xxxxxxxxxxxx> wrote: > On Sat, Jan 08, 2011 at 01:54:47PM +1100, Nick Piggin wrote: >> The rcu-walk stuff can be more tricky for your filesystem >> to take advantage of. >> >> If you supply a .d_revalidate, .permission, or .check_acl, >> then path walking is going to be slow and unscalable for >> you. > > Do you mean "as slow and unscalable as it has always been" or > "even slower now"? A quick look suggests the former, but I wanted to be > sure. Yeah it should be about the same. Bit more complex code so it might be a bit slower. A few code and branch and cache improvements so it might be a bit faster. Refcounts on the same dentry become a bit less scalable for using lock instead of atomic. On the other hand dropping the ref on leaf denty doesn't require global lock. It should not be urgent for 2.6.38. -- 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
