On 07/02/2013 02:22 PM, Jim Fehlig wrote:
On 06/28/2013 08:33 AM, Dario Faggioli wrote:
Although, having it depending on Xen >= 4.3 (by using the proper libxl feature flag).
Xen currently implements a NUMA placement policy which is basically the same as the 'interleaved' policy of `numactl', although it can be applied on a subset of the available nodes. We therefore hardcode "interleave" as 'numa_mode', and we use the newly introduced libxl interface to figure out what nodes a domain spans ('numa_nodeset').
With this change, it is now possible to query the NUMA node affinity of a running domain:
[raistlin@Zhaman ~]$ sudo virsh --connect xen:/// list Id Name State ---------------------------------------------------- 23 F18_x64 running
[raistlin@Zhaman ~]$ sudo virsh --connect xen:/// numatune 23 numa_mode : interleave numa_nodeset : 1
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com> --- src/libxl/libxl_driver.c | 138 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 138 insertions(+)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c index 53af609..9bd6d99 100644 --- a/src/libxl/libxl_driver.c +++ b/src/libxl/libxl_driver.c @@ -28,6 +28,7 @@ #include <math.h> #include <libxl.h> +#include <libxl_utils.h> #include <fcntl.h> #include <regex.h> @@ -4514,6 +4515,140 @@ libxlDomainSetSchedulerParameters(virDomainPtr dom, virTypedParameterPtr params, return libxlDomainSetSchedulerParametersFlags(dom, params, nparams, 0); } +/* NUMA node affinity information is available through libxl + * starting from Xen 4.3. */ +#ifdef LIBXL_HAVE_DOMAIN_NODEAFFINITY + +/* Number of Xen NUMA parameters */ +#define LIBXL_NUMA_NPARAM 2
Is there a similar definition in Xen? E.g. would future changes to libxl adding more parameters, but neglecting to update here, cause problems?
BTW, with cppi installed this fails 'make syntax-check' preprocessor_indentation cppi: src/libxl/libxl_driver.c: line 4523: not properly indented maint.mk: incorrect preprocessor indentation make: *** [sc_preprocessor_indentation] Error 1 Preprocessor nesting is indented as follows #if ... # define ... # if ... # define ... # endif #endif Regards, Jim