Commit e8c16495 authored Aug 07, 2017 by Xie XiuQi Committed by Ingo Molnar Aug 10, 2017

sched/debug: Show task state in /proc/sched_debug



Currently we print the runnable task in /proc/sched_debug, but
there is no task state information.

We don't know which task is in the runqueue and which task is sleeping.

Add task state in the runnable task list, like this:

  runnable tasks:
   S           task   PID         tree-key  switches  prio     wait-time             sum-exec        sum-sleep
  -----------------------------------------------------------------------------------------------------------
   S   watchdog/239  1452       -11.917445      2811     0         0.000000         8.949306         0.000000 7 0 /
   S  migration/239  1453     20686.367740         8     0         0.000000     16215.720897         0.000000 7 0 /
   S  ksoftirqd/239  1454    115383.841071        12   120         0.000000         0.200683         0.000000 7 0 /
  >R           test 21287      4872.190970       407   120         0.000000      4874.911790         0.000000 7 0 /autogroup-150
   R           test 21288      4868.385454       401   120         0.000000      3672.341489         0.000000 7 0 /autogroup-150
   R           test 21289      4868.326776       384   120         0.000000      3424.934159         0.000000 7 0 /autogroup-150

Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <cj.chengjian@huawei.com>
Cc: <huawei.libin@huawei.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1502095463-160172-2-git-send-email-xiexiuqi@huawei.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 74dc3384

kernel/sched/debug.c

+12 −6

Original line number	Diff line number	Diff line
		@@ -421,13 +421,19 @@ static char task_group_path(struct task_group tg)
		}
		#endif

		static const char stat_nam[] = TASK_STATE_TO_CHAR_STR;

		static void
		print_task(struct seq_file m, struct rq rq, struct task_struct *p)
		{
		if (rq->curr == p)
		SEQ_printf(m, "R");
		else
		SEQ_printf(m, " ");
		unsigned long state;

		if (rq->curr == p) {
		SEQ_printf(m, ">R");
		} else {
		state = p->state ? __ffs(p->state) + 1 : 0;
		SEQ_printf(m, " %c", state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?');
		}

		SEQ_printf(m, "%15s %5d %9Ld.%06ld %9Ld %5d ",
		p->comm, task_pid_nr(p),
		@@ -456,9 +462,9 @@ static void print_rq(struct seq_file m, struct rq rq, int rq_cpu)

		SEQ_printf(m,
		"\nrunnable tasks:\n"
		" task PID tree-key switches prio"
		" S task PID tree-key switches prio"
		" wait-time sum-exec sum-sleep\n"
		"------------------------------------------------------"
		"-------------------------------------------------------"
		"----------------------------------------------------\n");

		rcu_read_lock();

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