[Xen-devel] [RFC 3/9] xentop: show CPU load information

[Andrii Anisov <andrii.anisov@gmail.com>]

From: Andrii Anisov <andrii_anisov@epam.com>

Let xentop request and show information about CPU load provided
by new time accounting infrastructure.

Signed-off-by: Andrii Anisov <andrii_anisov@epam.com>
---
 tools/xenstat/libxenstat/src/xenstat.c      | 50 +++++++++++++++++++++++++++++
 tools/xenstat/libxenstat/src/xenstat.h      | 15 +++++++++
 tools/xenstat/libxenstat/src/xenstat_priv.h |  5 +++
 tools/xenstat/xentop/xentop.c               | 36 +++++++++++++++++++++
 4 files changed, 106 insertions(+)

diff --git a/tools/xenstat/libxenstat/src/xenstat.c b/tools/xenstat/libxenstat/src/xenstat.c
index 6f93d4e..cfb6504 100644
--- a/tools/xenstat/libxenstat/src/xenstat.c
+++ b/tools/xenstat/libxenstat/src/xenstat.c
@@ -134,6 +134,9 @@ void xenstat_uninit(xenstat_handle * handle)
 xenstat_node *xenstat_get_node(xenstat_handle * handle, unsigned int flags)
 {
 #define DOMAIN_CHUNK_SIZE 256
+	xc_cpuinfo_t *cpuinfo;
+	int max_cpus, nr_cpus;
+
 	xenstat_node *node;
 	xc_physinfo_t physinfo = { 0 };
 	xc_domaininfo_t domaininfo[DOMAIN_CHUNK_SIZE];
@@ -163,6 +166,28 @@ xenstat_node *xenstat_get_node(xenstat_handle * handle, unsigned int flags)
 	    * handle->page_size;
 
 	node->freeable_mb = 0;
+
+	max_cpus = node->num_cpus;
+
+	cpuinfo = calloc(max_cpus, sizeof(xc_cpuinfo_t));
+	if (!cpuinfo)
+		return NULL;
+
+	if (xc_getcpuinfo(handle->xc_handle, max_cpus, cpuinfo, &nr_cpus) < 0) {
+		free(cpuinfo);
+		return NULL;
+	}
+
+	for ( i = 0; i < nr_cpus; i++) {
+		node->idle_time += cpuinfo[i].idletime;
+		node->hyp_time += cpuinfo[i].hyptime;
+		node->guest_time += cpuinfo[i].guesttime;
+		node->gsync_time += cpuinfo[i].gsynctime;
+		node->irq_time += cpuinfo[i].irqtime;
+	}
+
+	free(cpuinfo);
+
 	/* malloc(0) is not portable, so allocate a single domain.  This will
 	 * be resized below. */
 	node->domains = malloc(sizeof(xenstat_domain));
@@ -332,6 +357,31 @@ unsigned long long xenstat_node_cpu_hz(xenstat_node * node)
 	return node->cpu_hz;
 }
 
+unsigned long long xenstat_node_idle_time(xenstat_node * node)
+{
+	return node->idle_time;
+}
+
+unsigned long long xenstat_node_guest_time(xenstat_node * node)
+{
+	return node->guest_time;
+}
+
+unsigned long long xenstat_node_hyp_time(xenstat_node * node)
+{
+	return node->hyp_time;
+}
+
+unsigned long long xenstat_node_gsync_time(xenstat_node * node)
+{
+	return node->gsync_time;
+}
+
+unsigned long long xenstat_node_irq_time(xenstat_node * node)
+{
+	return node->irq_time;
+}
+
 /* Get the domain ID for this domain */
 unsigned xenstat_domain_id(xenstat_domain * domain)
 {
diff --git a/tools/xenstat/libxenstat/src/xenstat.h b/tools/xenstat/libxenstat/src/xenstat.h
index 76a660f..9881ce5 100644
--- a/tools/xenstat/libxenstat/src/xenstat.h
+++ b/tools/xenstat/libxenstat/src/xenstat.h
@@ -80,6 +80,21 @@ unsigned int xenstat_node_num_cpus(xenstat_node * node);
 /* Get information about the CPU speed */
 unsigned long long xenstat_node_cpu_hz(xenstat_node * node);
 
+/* Get information about the CPU idle time */
+unsigned long long xenstat_node_idle_time(xenstat_node * node);
+
+/* Get information about the CPU guest execution time */
+unsigned long long xenstat_node_guest_time(xenstat_node * node);
+
+/* Get information about the CPU hypervisor execution time */
+unsigned long long xenstat_node_hyp_time(xenstat_node * node);
+
+/* Get information about the CPU guest syncronous trap execution time */
+unsigned long long xenstat_node_gsync_time(xenstat_node * node);
+
+/* Get information about the CPU IRQ serving time */
+unsigned long long xenstat_node_irq_time(xenstat_node * node);
+
 /*
  * Domain functions - extract information from a xenstat_domain
  */
diff --git a/tools/xenstat/libxenstat/src/xenstat_priv.h b/tools/xenstat/libxenstat/src/xenstat_priv.h
index 4eb44a8..64387cd 100644
--- a/tools/xenstat/libxenstat/src/xenstat_priv.h
+++ b/tools/xenstat/libxenstat/src/xenstat_priv.h
@@ -45,6 +45,11 @@ struct xenstat_node {
 	unsigned int flags;
 	unsigned long long cpu_hz;
 	unsigned int num_cpus;
+	unsigned long long hyp_time;
+	unsigned long long guest_time;
+	unsigned long long idle_time;
+	unsigned long long gsync_time;
+	unsigned long long irq_time;
 	unsigned long long tot_mem;
 	unsigned long long free_mem;
 	unsigned int num_domains;
diff --git a/tools/xenstat/xentop/xentop.c b/tools/xenstat/xentop/xentop.c
index af11ebf..7514559 100644
--- a/tools/xenstat/xentop/xentop.c
+++ b/tools/xenstat/xentop/xentop.c
@@ -930,6 +930,40 @@ void adjust_field_widths(xenstat_domain *domain)
 		fields[FIELD_VBD_WSECT-1].default_width = length;
 }
 
+void do_utilization(void)
+{
+	double us_elapsed = 0.0,
+		   us_hyp = 0.0,
+		   us_guest = 0.0,
+		   us_idle = 0.0,
+		   us_gsync = 0.0,
+		   us_irq = 0.0;
+
+	/* Can't calculate CPU percentage without a current and a previous sample.*/
+	if(prev_node != NULL && cur_node != NULL) {
+
+		/* Calculate the time elapsed in microseconds */
+		us_elapsed = ((curtime.tv_sec-oldtime.tv_sec)*1000000.0
+				  +(curtime.tv_usec - oldtime.tv_usec));
+
+		/* In the following, nanoseconds must be multiplied by 1000.0 to
+		 * convert to microseconds, then divided by 100.0 to get a percentage,
+		 * resulting in a multiplication by 10.0 */
+		us_idle = ((xenstat_node_idle_time(cur_node) -
+				   xenstat_node_idle_time(prev_node))/10.0)/us_elapsed;
+		us_guest = ((xenstat_node_guest_time(cur_node) -
+				   xenstat_node_guest_time(prev_node))/10.0)/us_elapsed;
+		us_hyp = ((xenstat_node_hyp_time(cur_node) -
+				   xenstat_node_hyp_time(prev_node))/10.0)/us_elapsed;
+		us_gsync = ((xenstat_node_gsync_time(cur_node) -
+				   xenstat_node_gsync_time(prev_node))/10.0)/us_elapsed;
+		us_irq = ((xenstat_node_irq_time(cur_node) -
+				   xenstat_node_irq_time(prev_node))/10.0)/us_elapsed;
+	}
+
+	print("%%CPU(s): %6.1f gu, %6.1f gs, %6.1f ir, %6.1f hy, %6.1f id \n",
+		  us_guest, us_gsync, us_irq, us_hyp, us_idle);
+}
 
 /* Section printing functions */
 /* Prints the top summary, above the domain table */
@@ -972,6 +1006,8 @@ void do_summary(void)
 	used = xenstat_node_tot_mem(cur_node);
 	freeable_mb = 0;
 
+	do_utilization();
+
 	/* Dump node memory and cpu information */
 	if ( freeable_mb <= 0 )
 	     print("Mem: %lluk total, %lluk used, %lluk free    ",
-- 
2.7.4


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