Re: [Xen-users] visit shared info page need a lock?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-06-12 at 17:51 +0800, goingstudy wrote:
> Hello everyone, I am new to Xen.
> When I read Xen source code, I find that no matter Xen hypervisor or
> dom visit shared info page, no lock is used.
> I want to know why it is lockless.

It has been designed that way (i.e. not to need them) by using lock-free
algorithms and datastructures.

Locks between two entities (e.g. hypervisor and kernel) are inherently
rather tricky.

Ian.



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