kdb: Add "show all runqs" debug command

Message-Id: <20230929045936.31535-1-damien@zamaudio.com>

3 files changed, 34 insertions, 0 deletions

diff --git a/ddb/db_command.c b/ddb/db_command.c
index d21386e6..2fae61b0 100644
--- a/ddb/db_command.c
+++ b/ddb/db_command.c
@@ -309,6 +309,7 @@ struct db_command db_show_all_cmds[] = {
 	{ "tasks",	db_show_all_tasks,	0,	0 },
 	{ "threads",	db_show_all_threads,	0,	0 },
 	{ "slocks",	(db_command_fun_t)db_show_all_slocks,	0,	0 },
+	{ "runqs",	(db_command_fun_t)db_show_all_runqs,	0,	0 },
 	{ (char *)0 }
 };
 
diff --git a/ddb/db_print.c b/ddb/db_print.c
index 3fbafe74..89250f7b 100644
--- a/ddb/db_print.c
+++ b/ddb/db_print.c
@@ -39,6 +39,9 @@
 #include <kern/task.h>
 #include <kern/thread.h>
 #include <kern/queue.h>
+#include <kern/sched.h>
+#include <kern/processor.h>
+#include <kern/smp.h>
 #include <ipc/ipc_port.h>
 #include <ipc/ipc_space.h>
 
@@ -329,6 +332,30 @@ db_show_all_tasks(db_expr_t addr,
 	    }
 }
 
+static void showrq(run_queue_t rq)
+{
+	db_printf("count(%d) low(%d)\n", rq->count, rq->low);
+}
+
+/*ARGSUSED*/
+void
+db_show_all_runqs(
+	db_expr_t	addr,
+	boolean_t	have_addr,
+	db_expr_t	count,
+	const char *	modif)
+{
+	int i;
+
+	db_printf("Processor set runq:\t");
+	showrq(&default_pset.runq);
+	for (i = 0; i < smp_get_numcpus(); i++) {
+	    db_printf("Processor #%d runq:\t", i);
+	    showrq(&cpu_to_processor(i)->runq);
+	}
+	db_printf("Stuck threads:\t%d", stuck_count);
+}
+
 /*ARGSUSED*/
 void
 db_show_all_threads(
diff --git a/ddb/db_print.h b/ddb/db_print.h
index 87db97be..27b3990a 100644
--- a/ddb/db_print.h
+++ b/ddb/db_print.h
@@ -50,6 +50,12 @@ void db_show_all_threads(
 	db_expr_t	count,
 	const char *	modif);
 
+void db_show_all_runqs(
+	db_expr_t	addr,
+	int		have_addr,
+	db_expr_t	count,
+	const char *	modif);
+
 db_addr_t db_task_from_space(
 	ipc_space_t	space,
 	int		*task_id);