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    SubjectRe: [patch 04/33] fs: brlock vfsmount_lock
    On Tue, Sep 22, 2009 at 04:17:51PM +0100, Al Viro wrote:
    > On Fri, Sep 04, 2009 at 04:51:45PM +1000, npiggin@suse.de 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.



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