Hello, Can't check the code right now, but a couple questions below.
> One of the issues I had was that the Core IDs (as reported by Xen) > are enumerated per socket rather than as an entire system. The > purpose of "HACK - patch up cpu_to_core." in hwloc_get_xen_info() is > to change the per-socket enumeration to being per system. > Samuel believes that hwloc should be able to cope with duplicate core > IDs with different cpusets, but if I attempt to do that, I get the > following error: > **************************************************************************** > * hwloc has encountered what looks like an error from the operating > system. * * object (Core P#0 cpuset 0x30000003) intersection without > inclusion! * Error occurred in topology.c line 853 * * Please report > this error message to the hwloc user's mailing list, * along with > the output from the hwloc-gather-topology.sh script. > **************************************************************************** I don't understand what's going on here. Can you post the list of PU/core/socket IDs that Xen reports so that I see what is unique and what is not? > I currently have a crazy idea for getting at the cache information. > topology-x86.c has a lot of cpuid knowledge, and I have a proposed > new hypercall which executes cpuid on a specific PU. Would it be > possible (or indeed sensible) to parametrise the code in > topology-x86.c to take a few function pointers for get/set binding > information, and for the cpuid call itself? I don't see why we couldn't do that. Can you post an example of what the Xen cpuid hypercall prototype would be, so that I see how I need to change the x86 backend? > That way, the common x86 knowledge could be used correctly by the Xen > component, while still keeping its current design. Is there anything that the current Xen backend supports and that wouldn't be feasible through x86 cpuid? The x86 component can already detect a lot of topology information, including cores/caches/sockets/NUMA. Maybe the NUMA node sizes? By the way, which architectures are supported by Xen aside of x86? Does Xen have topology information for them? Brice
