Re: [PATCH v2 2.6.38-rc8-tip 4/20] 4: uprobes: Adding and remove a uprobe in a rb tree.

Peter Zijlstra
2011-03-15T19:46:36Z

On Tue, 2011-03-15 at 20:22 +0100, Thomas Gleixner wrote:
> I am not sure if its a good idea to walk the tree
> > as and when the tree is changing either because of a insertion or
> > deletion of a probe.
>
> I know that you cannot walk the tree lockless except you would use
> some rcu based container for your probes.

You can in fact combine a seqlock, rb-trees and RCU to do lockless
walks.

https://lkml.org/lkml/2010/10/20/160

and

https://lkml.org/lkml/2010/10/20/437

But doing that would be an optimization best done once we get all this
working nicely.