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hv: trace: show cpu usage of vms in pcpu sharing case

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To maximize the cpu utilization, core 0 is usually shared by service
vm and guest vm. But there are no statistics to show the cpu occupation
of each vm.

This patch is to provide cpu usage statistic for users. To calculate
it, a new trace event is added and marked in scheduling context switch,
accompanying with a new python script to analyze the data from acrntrace
output.

Tracked-On: #8621
Signed-off-by: nacui <na.cui@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
Reviewed-by: Haiwei Li <haiwei.li@intel.com>
This commit is contained in:
nacui
2024-06-14 11:16:25 +08:00
committed by acrnsi-robot
parent 926f2346df
commit 512c98fd79
6 changed files with 216 additions and 2 deletions
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6
hypervisor/common/schedule.c
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@@ -13,6 +13,7 @@
#include <schedule.h>
#include <sprintf.h>
#include <asm/irq.h>
#include <trace.h>
bool is_idle_thread(const struct thread_object *obj)
{
@@ -172,6 +173,7 @@ void schedule(void)
struct thread_object *next = &per_cpu(idle, pcpu_id);
struct thread_object *prev = ctl->curr_obj;
uint64_t rflag;
char name[16];
obtain_schedule_lock(pcpu_id, &rflag);
if (ctl->scheduler->pick_next != NULL) {
@@ -182,6 +184,10 @@ void schedule(void)
/* If we picked different sched object, switch context */
if (prev != next) {
if (prev != NULL) {
memcpy_erms(name, prev->name, 4);
memcpy_erms(name + 4, next->name, 4);
memset(name + 8, 0, sizeof(name) - 8);
TRACE_16STR(TRACE_SCHED_NEXT, name);
if (prev->switch_out != NULL) {
prev->switch_out(prev);
}