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Re: [Xen-devel] [Patch] use full-size cpumask for vcpu-pin

To: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>

From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>

Date: Wed, 11 Aug 2010 06:32:21 +0200

Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>

Delivery-date: Tue, 10 Aug 2010 21:33:18 -0700

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On 08/10/10 16:11, Ian Jackson wrote:

Juergen Gross writes ("[Xen-devel] [Patch] use full-size cpumask for vcpu-pin"):

The reason is the allocation of the cpumap for pinning: the size is only for
the ACTUAL number of physical cpus in the system, not the possible number.
The solution is to allocate a cpumap for up to NR_CPUS.


Thanks for this patch.  However, this doesn't seem to be even slightly
backwards-compatible, because it changes the layout of the physinfo
sysctl response.

No, it doesn't change the layout. The new structure member just fills a hole which was already there due to alignment of the next member. Juergen -- Juergen Gross Principal Developer Operating Systems TSP ES&S SWE OS6 Telephone: +49 (0) 89 3222 2967 Fujitsu Technology Solutions e-mail: juergen.gross@xxxxxxxxxxxxxx Domagkstr. 28 Internet: ts.fujitsu.com D-80807 Muenchen Company details: ts.fujitsu.com/imprint.html _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel

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