[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] xenbus stress testing
> > On Fri, Feb 18, Paul Durrant wrote: > > > How do you propose to lock against another VM updating a counter in shared > memory? > > I thought xenstore uses the same ringbuffer as defined by > DEFINE_RING_TYPES(). But reading the code in > include/xen/interface/io/xs_wire.h shows it has its own logic. > > And reading further in xenpaging code, which I had in mind while I wrote > the mail, shows there is a separate spinlock. > > I can imagine that even if a lock exists, a VM crashing while holding > the lock can stall all other VMs. So its probably not the best idea. > It's also inefficient when a perfectly good lock free method exists. James _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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