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Re: [Xen-devel] xenbus stress testing
| To: | Paul Durrant <Paul.Durrant@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] xenbus stress testing |
| From: | Olaf Hering <olaf@xxxxxxxxx> |
| Date: | Fri, 18 Feb 2011 13:01:10 +0100 |
| Cc: | James Harper <james.harper@xxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 18 Feb 2011 04:04:13 -0800 |
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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. Olaf _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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