--- gnumach/include/mach/thread_info.h	2019-09-03 01:22:10.920747802 +0200
+++ GNUMach_SMP/include/mach/thread_info.h	2019-10-27 20:06:55.785860002 +0100
@@ -107,6 +107,7 @@
 	integer_t	cur_priority;	/* current priority */
 /*boolean_t*/integer_t	depressed;	/* depressed ? */
 	integer_t	depress_priority; /* priority depressed from */
+	integer_t	last_processor; /* last processor used by the thread */
 };
 
 typedef struct thread_sched_info	thread_sched_info_data_t;
--- gnumach/kern/thread.c	2019-09-03 01:22:10.932747830 +0200
+++ GNUMach_SMP/kern/thread.c	2019-10-27 20:36:05.156083522 +0100
@@ -1580,7 +1580,10 @@
 	else if (flavor == THREAD_SCHED_INFO) {
 	    thread_sched_info_t	sched_info;
 
-	    if (*thread_info_count < THREAD_SCHED_INFO_COUNT) {
+		/* Allow *thread_info_count to be one smaller than the
+	       usual amount, because last_processor is a
+		   new member that some callers might not know about. */
+	    if (*thread_info_count < THREAD_SCHED_INFO_COUNT -1) {
 		return KERN_INVALID_ARGUMENT;
 	    }
 
@@ -1609,6 +1612,12 @@
 	    sched_info->depressed = (thread->depress_priority >= 0);
 	    sched_info->depress_priority = thread->depress_priority;
 
+		#if NCPUS > 1
+		sched_info->last_processor = thread->last_processor;
+		#else
+		sched_info->last_processor = 0;
+		#endif
+
 	    thread_unlock(thread);
 	    splx(s);