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/include/arch/amd64/cpu.h |  4 ++++
 sys/include/sys/limits.h     |  2 --
 sys/include/sys/sched.h      | 12 ++++++++++++
 3 files changed, 16 insertions(+), 2 deletions(-)

(limited to 'sys/include')

diff --git a/sys/include/arch/amd64/cpu.h b/sys/include/arch/amd64/cpu.h
index a5f09fb..a047cef 100644
--- a/sys/include/arch/amd64/cpu.h
+++ b/sys/include/arch/amd64/cpu.h
@@ -33,6 +33,7 @@
 #include <sys/types.h>
 #include <sys/cdefs.h>
 #include <sys/proc.h>
+#include <sys/sched.h>
 #include <sys/spinlock.h>
 #include <machine/tss.h>
 
@@ -53,6 +54,7 @@ struct cpu_info {
     size_t lapic_tmr_freq;
     uint8_t irq_mask;
     vaddr_t shootdown_va;
+    struct sched_cpu stat;
     struct tss_entry *tss;
     struct proc *curtd;
     struct spinlock lock;
@@ -67,6 +69,8 @@ void cpu_enable_smep(void);
 void cpu_disable_smep(void);
 
 struct cpu_info *cpu_get(uint32_t index);
+struct sched_cpu *cpu_get_stat(uint32_t cpu_index);
+
 uint32_t cpu_count(void);
 void cpu_shootdown_tlb(vaddr_t va);
 
diff --git a/sys/include/sys/limits.h b/sys/include/sys/limits.h
index 5b97b68..f6aed9d 100644
--- a/sys/include/sys/limits.h
+++ b/sys/include/sys/limits.h
@@ -35,7 +35,5 @@
 #define SSIZE_MAX 32767
 #define ARG_MAX 4096
 #define CHAR_BIT 8
-#if defined(_KERNEL)
 #define CPU_MAX 256
-#endif  /* _KERNEL */
 #endif  /* !_SYS_LIMITS_H_ */
diff --git a/sys/include/sys/sched.h b/sys/include/sys/sched.h
index d80483a..abc2718 100644
--- a/sys/include/sys/sched.h
+++ b/sys/include/sys/sched.h
@@ -32,6 +32,17 @@
 
 #include <sys/proc.h>
 #include <sys/cdefs.h>
+#include <sys/limits.h>
+
+/*
+ * Scheduler CPU information
+ *
+ * @nswitch: Number of context switches
+ * @idle: Number of milliseconds idle
+ */
+struct sched_cpu {
+    uint32_t nswitch;
+};
 
 /*
  * Scheduler statistics
@@ -44,6 +55,7 @@ struct sched_stat {
     size_t nproc;
     uint16_t ncpu;
     uint32_t quantum_usec;
+    struct sched_cpu cpus[CPU_MAX];
 };
 
 #if defined(_KERNEL)
-- 
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