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Re: [Xen-devel] [RFO] #2: removing a concurrency bottleneck
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [RFO] #2: removing a concurrency bottleneck |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Fri, 20 Mar 2009 08:46:55 +0000 |
| Cc: | "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 20 Mar 2009 01:47:23 -0700 |
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| Thread-topic: | [Xen-devel] [RFO] #2: removing a concurrency bottleneck |
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On 20/03/2009 08:30, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > It should certainly be num_possible_cpus(), which (hopefully) is identical to > num_present_cpus() until physical CPU hotplug gets supported, in which > case some infrastructure will need to be added anyway so that your and > other code could do such per-CPU allocations on demand. > > Other than Keir suggested, I'd not recommend adding further NR_CPUS > sized arrays (based mostly on how long it took to mostly (fully?) get rid of > them in Linux in order to support huge systems) - just use per-CPU pointers > to dynamically allocated memory. Oh yes, that's a better idea! Please do that instead. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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