Hwloc xen topology v5#3
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This requires the following patch (which is applicable for backport to at least Xen 4.3): http://xenbits.xen.org/gitweb/?p=people/andrewcoop/xen.git;a=commitdiff;h=c1faa00881ba1de42e3aff6a7009a69ff7940b19 which implements a cleaner API for xc_{topology,numa}info. This patch provides basic topology enumeration in hwloc. Xen support should be built automatically given an appropriate version of libxenctrl (i.e. with the above patch) in the build environment. Xen support can be built as a plugin (to remove direct dependences on libxenctrl), and is disabled by default. In dom0, use `HWLOC_COMPONENETS=xen ./lstop ...` to enable Xen system topology enumeration in preference to the faked topology which the kernel gets to see. This patch provides basic support for PUs, cores, sockets and numa nodes, with numa nodes being annotated with availabe memory[1]. It has been sanity tested on various different servers in our testing pool. Some of this patch includes folded patches from Brice Goglin <Brice.Goglin@inria.fr> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> [1] It turns out Xen's idea of memory attached to a node includes pages mapping IO regions. This is a hypervisor bug has been raised on xen-devel.
Use the brand new hwloc_x86_discovery() function to allow the common x86 code to enumerate cache information under Xen. The following patch is required http://xenbits.xen.org/gitweb/?p=people/andrewcoop/xen.git;a=commitdiff;h=51cfdf2dfd5fd905f136418810e250cd21c6643c which implements the xc_xen_cpuid() function in libxc and Xen. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
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Xen v5 Commits by Andy and Brice towards
https://github.com/xenserver-next/hwloc/tree/x86-common-for-xen