torture: Add task state to writer-task stall printk()s (4ffa6699) · Commits · 戴 / test

This commit adds a dump of the scheduler state for stalled rcutorture writer tasks. This addition provides yet more debug for the intermittent "failures to proceed", where grace periods move ahead but the rcutorture writer tasks fail to do so. Signed-off-by:

Paul E. McKenney <paulmck@linux.vnet.ibm.com>

kernel/rcu/rcutorture.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -1238,6 +1238,7 @@ rcu_torture_stats_print(void)
		long pipesummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 };
		long batchsummary[RCU_TORTURE_PIPE_LEN + 1] = { 0 };
		static unsigned long rtcv_snap = ULONG_MAX;
		struct task_struct *wtp;

		for_each_possible_cpu(cpu) {
		for (i = 0; i < RCU_TORTURE_PIPE_LEN + 1; i++) {
		@@ -1312,10 +1313,12 @@ rcu_torture_stats_print(void)

		rcutorture_get_gp_data(cur_ops->ttype,
		&flags, &gpnum, &completed);
		pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x\n",
		wtp = READ_ONCE(writer_task);
		pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx\n",
		rcu_torture_writer_state_getname(),
		rcu_torture_writer_state,
		gpnum, completed, flags);
		gpnum, completed, flags,
		wtp == NULL ? ~0UL : wtp->state);
		show_rcu_gp_kthreads();
		rcu_ftrace_dump(DUMP_ALL);
		}

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