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Re: [Xen-devel] writable pagetables scalability issue
| To: | Rik van Riel <riel@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] writable pagetables scalability issue |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 07 Dec 2007 18:17:03 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Fri, 07 Dec 2007 10:19:11 -0800 |
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| Thread-index: | Acg4/V2zm/1TkKTwEdy7ewAX8io7RQ== |
| Thread-topic: | [Xen-devel] writable pagetables scalability issue |
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On 7/12/07 17:53, "Rik van Riel" <riel@xxxxxxxxxx> wrote: >> I think we can probably just as easily strip out the big lock entirely from >> the critical paths. It's not really needed much these days. > > "not needed much" makes me kind of nervous :) > > Exactly what do we still need to protect against? The main thing right now is update_va_mapping() goes at the linear map, and has to avoid races where a pte is being deconstructed but has not yet been flushed from the linear map. If we change the implementation of update_va_mapping() then I think the biglock can fall away. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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