kernel: mmu: collect more demand paging statistics

This adds more bits to gather statistics on demand paging,
e.g. clean vs dirty pages evicted, # page faults with
IRQ locked/unlocked, etc.

Also extends this to gather per-thread demand paging
statistics.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

include/kernel/thread.h

@@ -7,6 +7,10 @@
 #ifndef ZEPHYR_INCLUDE_KERNEL_THREAD_H_
 #define ZEPHYR_INCLUDE_KERNEL_THREAD_H_
 
+#ifdef CONFIG_DEMAND_PAGING_THREAD_STATS
+#include <sys/mem_manage.h>
+#endif
+
 /**
  * @typedef k_thread_entry_t
  * @brief Thread entry point function type.
@@ -279,6 +283,11 @@ struct k_thread {
 	struct _thread_runtime_stats rt_stats;
 #endif
 
+#ifdef CONFIG_DEMAND_PAGING_THREAD_STATS
+	/** Paging statistics */
+	struct k_mem_paging_stats_t paging_stats;
+#endif
+
 	/** arch-specifics: must always be at the end */
 	struct _thread_arch arch;
 };