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[Xen-ia64-devel] Re: [XenPPC] Re: [Xen-devel] [PATCH] [GNTTAB] expandabl
| To: | Hollis Blanchard <hollisb@xxxxxxxxxx> |
|---|---|
| Subject: | [Xen-ia64-devel] Re: [XenPPC] Re: [Xen-devel] [PATCH] [GNTTAB] expandable grant table |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Tue, 27 Feb 2007 07:50:41 +0000 |
| Cc: | xen-ppc-devel@xxxxxxxxxxxxxxxxxxx, Isaku Yamahata <yamahata@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 26 Feb 2007 23:49:39 -0800 |
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| In-reply-to: | <1172534718.910.43.camel@basalt> |
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| Thread-topic: | [XenPPC] Re: [Xen-devel] [PATCH] [GNTTAB] expandable grant table |
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On 27/2/07 00:05, "Hollis Blanchard" <hollisb@xxxxxxxxxx> wrote: > I don't believe that's a concern, since updating > grant_table->nr_grant_frames is the very last step in > gnttab_grow_table(), and it will only grow. If there's a memory barrier before the update of nr_grant_frames, explicitly or implied, then removing the locking from add_to_physmap is fine. Otherwise not: reading an integer is atomic, but using that as a flag to indicate presence of other state updated under the same lock is just a little bit suspect (but might be okay). -- Keir _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ia64-devel |
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