From 8a3973e46941b6a8c88a49594364a04ee4b1d84e Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 16 Jul 2025 20:48:35 -0400
Subject: kernel: accnt: Keep track of per-cpu stats

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/amd64/amd64/mp.c           | 18 ++++++++++++++++++
 sys/arch/amd64/amd64/proc_machdep.c |  5 +++++
 2 files changed, 23 insertions(+)

(limited to 'sys/arch')

diff --git a/sys/arch/amd64/amd64/mp.c b/sys/arch/amd64/amd64/mp.c
index dbee32c..21881b2 100644
--- a/sys/arch/amd64/amd64/mp.c
+++ b/sys/arch/amd64/amd64/mp.c
@@ -81,6 +81,24 @@ cpu_get(uint32_t index)
     return ci_list[index];
 }
 
+/*
+ * Grab the CPU stat structured of a specified
+ * processor
+ *
+ * @cpu_index: CPU index number
+ */
+struct sched_cpu *
+cpu_get_stat(uint32_t cpu_index)
+{
+    struct cpu_info *ci;
+
+    if ((ci = cpu_get(cpu_index)) == NULL) {
+        return NULL;
+    }
+
+    return &ci->stat;
+}
+
 uint32_t
 cpu_count(void)
 {
diff --git a/sys/arch/amd64/amd64/proc_machdep.c b/sys/arch/amd64/amd64/proc_machdep.c
index 72c2b56..ad807fe 100644
--- a/sys/arch/amd64/amd64/proc_machdep.c
+++ b/sys/arch/amd64/amd64/proc_machdep.c
@@ -245,6 +245,7 @@ static void
 sched_switch_to(struct trapframe *tf, struct proc *td)
 {
     struct cpu_info *ci;
+    struct sched_cpu *cpustat;
     struct pcb *pcbp;
 
     ci = this_cpu();
@@ -253,6 +254,10 @@ sched_switch_to(struct trapframe *tf, struct proc *td)
         memcpy(tf, &td->tf, sizeof(*tf));
     }
 
+    /* Update stats */
+    cpustat = &ci->stat;
+    cpustat->nswitch++;
+
     ci->curtd = td;
     pcbp = &td->pcb;
     pmap_switch_vas(pcbp->addrsp);
-- 
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