Re: [libvirt] [PATCHv7 02/18] util: Introduce resctrl monitor for CMT

Cache Monitoring Technology (aka CMT) provides the capability to report cache utilization information of system task. This patch introduces the concept of resctrl monitor through data structure virResctrlMonitor. Signed-off-by: Wang Huaqiang <huaqiang.wang(a)intel.com&gt; --- src/libvirt_private.syms | 1 + src/util/virresctrl.c | 79 ++++++++++++++++++++++++++++++++++++++++++++---- src/util/virresctrl.h | 9 ++++++ 3 files changed, 83 insertions(+), 6 deletions(-) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 335210c..d2573c5 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms

@@ -275,6 +281,18 @@ virResctrlInfoMonFree(virResctrlInfoMonPtr mon) * a sparse array to represent whether a memory bandwidth allocation happens * on corresponding node. The available memory controller number is collected * in 'virResctrlInfo'. + * + * =====Cache monitoring technology (CMT)===== + * + * Cache monitoring technology is used to perceive how many cache the process + * is using actually. virResctrlMonitor represents the resource control + * monitoring group, it is supported to monitor resource utilization + * information on granularity of vcpu. + * + * From hardware perspective, cache monitoring technology (CMT), memory

From a

+ * bandwidth technology (MBM), as well as the CAT and MBA, are all orthogonal + * features. The monitor will be created under the scope of default resctl

+ * group if no specific CAT or MBA entries are provided for the guest." */ struct _virResctrlAllocPerType { /* There could be bool saying whether this is set or not, but since everything @@ -320,6 +338,29 @@ struct _virResctrlAlloc { char *path; }; +/* + * virResctrlMonitor is the data structure for resctrl monitor. Resctrl + * monitor represents a resctrl monitoring group, which can be used to + * monitor the resource utilization information for either cache or + * memory bandwidth. + */ +struct _virResctrlMonitor { + virObject parent; + + /* In resctrl, each monitor is associated with one specific allocation,

+ * either the allocation under / sys / fs / resctrl or allocation of the