tree_stall.h (4f2c0a4acffbec01079c28f839422e64ddeff004) tree_stall.h (be42f00b73a0f50710d16eb7cb4efda0cce062dd)
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * RCU CPU stall warnings for normal RCU grace periods
4 *
5 * Copyright IBM Corporation, 2019
6 *
7 * Author: Paul E. McKenney <paulmck@linux.ibm.com>
8 */

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423
424 j = jiffies - READ_ONCE(rdp->rcuc_activity);
425
426 if (jp)
427 *jp = j;
428 return j > 2 * HZ;
429}
430
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * RCU CPU stall warnings for normal RCU grace periods
4 *
5 * Copyright IBM Corporation, 2019
6 *
7 * Author: Paul E. McKenney <paulmck@linux.ibm.com>
8 */

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423
424 j = jiffies - READ_ONCE(rdp->rcuc_activity);
425
426 if (jp)
427 *jp = j;
428 return j > 2 * HZ;
429}
430
431static void print_cpu_stat_info(int cpu)
432{
433 struct rcu_snap_record rsr, *rsrp;
434 struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu);
435 struct kernel_cpustat *kcsp = &kcpustat_cpu(cpu);
436
437 if (!rcu_cpu_stall_cputime)
438 return;
439
440 rsrp = &rdp->snap_record;
441 if (rsrp->gp_seq != rdp->gp_seq)
442 return;
443
444 rsr.cputime_irq = kcpustat_field(kcsp, CPUTIME_IRQ, cpu);
445 rsr.cputime_softirq = kcpustat_field(kcsp, CPUTIME_SOFTIRQ, cpu);
446 rsr.cputime_system = kcpustat_field(kcsp, CPUTIME_SYSTEM, cpu);
447
448 pr_err("\t hardirqs softirqs csw/system\n");
449 pr_err("\t number: %8ld %10d %12lld\n",
450 kstat_cpu_irqs_sum(cpu) - rsrp->nr_hardirqs,
451 kstat_cpu_softirqs_sum(cpu) - rsrp->nr_softirqs,
452 nr_context_switches_cpu(cpu) - rsrp->nr_csw);
453 pr_err("\tcputime: %8lld %10lld %12lld ==> %d(ms)\n",
454 div_u64(rsr.cputime_irq - rsrp->cputime_irq, NSEC_PER_MSEC),
455 div_u64(rsr.cputime_softirq - rsrp->cputime_softirq, NSEC_PER_MSEC),
456 div_u64(rsr.cputime_system - rsrp->cputime_system, NSEC_PER_MSEC),
457 jiffies_to_msecs(jiffies - rsrp->jiffies));
458}
459
431/*
432 * Print out diagnostic information for the specified stalled CPU.
433 *
434 * If the specified CPU is aware of the current RCU grace period, then
435 * print the number of scheduling clock interrupts the CPU has taken
436 * during the time that it has been aware. Otherwise, print the number
437 * of RCU grace periods that this CPU is ignorant of, for example, "1"
438 * if the CPU was aware of the previous grace period.

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479 "!."[!delta],
480 ticks_value, ticks_title,
481 rcu_dynticks_snap(cpu) & 0xffff,
482 ct_dynticks_nesting_cpu(cpu), ct_dynticks_nmi_nesting_cpu(cpu),
483 rdp->softirq_snap, kstat_softirqs_cpu(RCU_SOFTIRQ, cpu),
484 data_race(rcu_state.n_force_qs) - rcu_state.n_force_qs_gpstart,
485 rcuc_starved ? buf : "",
486 falsepositive ? " (false positive?)" : "");
460/*
461 * Print out diagnostic information for the specified stalled CPU.
462 *
463 * If the specified CPU is aware of the current RCU grace period, then
464 * print the number of scheduling clock interrupts the CPU has taken
465 * during the time that it has been aware. Otherwise, print the number
466 * of RCU grace periods that this CPU is ignorant of, for example, "1"
467 * if the CPU was aware of the previous grace period.

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508 "!."[!delta],
509 ticks_value, ticks_title,
510 rcu_dynticks_snap(cpu) & 0xffff,
511 ct_dynticks_nesting_cpu(cpu), ct_dynticks_nmi_nesting_cpu(cpu),
512 rdp->softirq_snap, kstat_softirqs_cpu(RCU_SOFTIRQ, cpu),
513 data_race(rcu_state.n_force_qs) - rcu_state.n_force_qs_gpstart,
514 rcuc_starved ? buf : "",
515 falsepositive ? " (false positive?)" : "");
516
517 print_cpu_stat_info(cpu);
487}
488
489/* Complain about starvation of grace-period kthread. */
490static void rcu_check_gp_kthread_starvation(void)
491{
492 int cpu;
493 struct task_struct *gpk = rcu_state.gp_kthread;
494 unsigned long j;

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519
520/* Complain about starvation of grace-period kthread. */
521static void rcu_check_gp_kthread_starvation(void)
522{
523 int cpu;
524 struct task_struct *gpk = rcu_state.gp_kthread;
525 unsigned long j;

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