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Re: [Xen-devel] Fwd: Re: struct page field arrangement
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Fwd: Re: struct page field arrangement |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Fri, 16 Mar 2007 14:13:13 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Fri, 16 Mar 2007 07:12:55 -0700 |
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| Thread-topic: | [Xen-devel] Fwd: Re: struct page field arrangement |
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On 16/3/07 13:47, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > Btw., another question that made me wonder already when doing the > original patch: why is it that x86-64 properly uses locking for mm_pin_all(), > yet i386 doesn't need to? Neither needs to. Well, assuming you're not using CONFIG_PREEMPT. :-) Either we are in stop_machine context, or we have offlined all other CPUs via cpu hotplug. In the absence of involuntary preemption it's therefore safe to proceed without locking. But probably inadvisable (we'd like to support full CONFIG_PREEMPT sometime in the future)... I think the 386 code should be changed to match x86/64. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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