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Re: [Xen-devel] [PATCH 7/7] introduce write-once optimization
| To: | Jan Beulich <JBeulich@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH 7/7] introduce write-once optimization |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 22 Sep 2009 09:27:02 +0100 |
| Cc: | |
| Delivery-date: | Tue, 22 Sep 2009 01:27:55 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH 7/7] introduce write-once optimization |
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On 21/09/2009 13:12, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote: > This one is likely the most questionable part: Realizing that the > compiler can do a much better job in terms of CSE when the variables > needed are constant, this introduces and extension to the read-mostly > variables, allowing variables to be marked as being written just > during boot initialization. How much of a win overall was this? The main concern comes from mixing the two aliased variables within a single linkage unit, where it will be hard to know how clever the compiler might be with inlining and inter-function optimisations. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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