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Commit 0032f4e8 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcutorture: Dump writer stack if stalled 



Right now, rcutorture warns if an rcu_torture_writer() kthread stalls,
but this warning is not always all that helpful.  This commit therefore
makes the first such warning include a stack dump.

This in turn requires that sched_show_task() be exported to GPL modules,
so this commit makes that change as well.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 2b1516e5

kernel/rcu/rcutorture.c

+6 −0
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ 
#include <asm/byteorder.h>

#include <linux/torture.h>

#include <linux/vmalloc.h>

#include <linux/sched/debug.h>



#include "rcu.h"
@@ -1240,6 +1241,7 @@ 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;

	static bool splatted;

	struct task_struct *wtp;



	for_each_possible_cpu(cpu) {
@@ -1325,6 +1327,10 @@ rcu_torture_stats_print(void) 
			 gpnum, completed, flags,

			 wtp == NULL ? ~0UL : wtp->state,

			 wtp == NULL ? -1 : (int)task_cpu(wtp));

		if (!splatted && wtp) {

			sched_show_task(wtp);

			splatted = true;

		}

		show_rcu_gp_kthreads();

		rcu_ftrace_dump(DUMP_ALL);

	}

kernel/sched/core.c

+1 −0
Original line number Diff line number Diff line
@@ -5165,6 +5165,7 @@ void sched_show_task(struct task_struct *p) 
	show_stack(p, NULL);

	put_task_stack(p);

}

EXPORT_SYMBOL_GPL(sched_show_task);



static inline bool

state_filter_match(unsigned long state_filter, struct task_struct *p)