[Spice-devel] [PATCH spice-server v2 2/3] Fix removing a node

[Christophe Fergeau]

On Wed, Nov 16, 2016 at 10:32:58AM -0500, Frediano Ziglio wrote:
> > 
> > In the short log, I'd talk about "node removal" rather than "removing a
> > node"
> > 
> > On Wed, Nov 16, 2016 at 11:35:06AM +0000, Frediano Ziglio wrote:
> > > Avoid to produce loop in the tree removing and adding nodes.
> > > Unlink the node from the containing tree.
> > > This possibly will create unlinked trees if a parent node is
> > > deleted.
> > 
> > If I understand this correctly, the node was only invalidated, but was
> > not removed from the tree contrary to what "stat_file_remove" implies.
> > This means that the could then end up being reused, which would most
> > likely corrupt the tree, or something like that?
> > 
> 
> Yes, what was actually happening that the creation of loops
> inside the tree caused some statistical function to go into
> infinite loop (and reds_stat tool too).
> I don't consider the removal (which is O(n)) a performance
> problem as not in a hot path.
> Currently no removal is called but as we are speaking
> about implementing destroying objects this would have
> raised as a problem later.
> To optimize we could store somewhere (for instance using
> the top bits in the flag field) the previous sibling or
> the parent... or we could update the format of this file
> I don't think it's a big issue.
> 

Would be nice to have a more detailed commit log I guess..

Christophe
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