On Tue, Sep 22, 2009 at 04:17:51PM +0100, Al Viro wrote: > On Fri, Sep 04, 2009 at 04:51:45PM +1000, npiggin@xxxxxxx wrote: > > Use a brlock for the vfsmount lock. > > I like it, but I'd like to see how costly it becomes on heavily SMP boxen. > Creation/removal of bindings as load... I could test that... Is there some realistic scenario I can try to implement that exercises this? (failing that, I'll happily do a microbenchmark). I was thinking it *might* be possible to do RCU... but especially coming up with a scheme that avoids synchronize_rcu() in the umount path is not trivial, so perhaps the simple read/write annotations with brlock behind the scenes is a more reasonable step. I do also actually owe you some documentation with this one too, which I will get around to adding. -- 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
