[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH, v2] reduce 'd' debug key's global impact
On 06/05/2010 09:14, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote: >>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 06.05.10 10:01 >>> >> Although I suppose the event-check vector has a cleaner interface for >> calling it and should be implemented for all architectures. If you add >> whatever new flag you need to irq_cpustat_t then it would be cheap to check, >> being a definite cache hit. I suppose each cpu would >> check-and-check-and-clear it, and then set it for the next CPU when it is >> done. That doesn't sound too bad. > > Hmm, isn't irq_cpustat_t being used mostly on the local CPU so far, > and hence introducing reasons for bouncing the cache line wouldn't > be nice? It would only get bounced when the 'd' key is pressed, right? I think we could tolerate that frequency of bounce. :-) -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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