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4a5f133c15
Several variants of Linux-kernel RCU interact with task-exit processing, including preemptible RCU, Tasks RCU, and Tasks Trace RCU. This commit therefore adds testing of this interaction to rcutorture by adding rcutorture.read_exit_burst and rcutorture.read_exit_delay kernel-boot parameters. These kernel parameters control the frequency and spacing of special read-then-exit kthreads that are spawned. [ paulmck: Apply feedback from Dan Carpenter's static checker. ] [ paulmck: Reduce latency to avoid false-positive shutdown hangs. ] Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Common functions for in-kernel torture tests.
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*
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* Copyright IBM Corporation, 2014
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*
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* Author: Paul E. McKenney <paulmck@linux.ibm.com>
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*/
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#ifndef __LINUX_TORTURE_H
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#define __LINUX_TORTURE_H
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#include <linux/types.h>
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#include <linux/cache.h>
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#include <linux/spinlock.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/seqlock.h>
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#include <linux/lockdep.h>
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#include <linux/completion.h>
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#include <linux/debugobjects.h>
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#include <linux/bug.h>
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#include <linux/compiler.h>
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/* Definitions for a non-string torture-test module parameter. */
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#define torture_param(type, name, init, msg) \
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static type name = init; \
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module_param(name, type, 0444); \
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MODULE_PARM_DESC(name, msg);
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#define TORTURE_FLAG "-torture:"
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#define TOROUT_STRING(s) \
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pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s)
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#define VERBOSE_TOROUT_STRING(s) \
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do { if (verbose) pr_alert("%s" TORTURE_FLAG " %s\n", torture_type, s); } while (0)
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#define VERBOSE_TOROUT_ERRSTRING(s) \
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do { if (verbose) pr_alert("%s" TORTURE_FLAG "!!! %s\n", torture_type, s); } while (0)
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/* Definitions for online/offline exerciser. */
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typedef void torture_ofl_func(void);
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bool torture_offline(int cpu, long *n_onl_attempts, long *n_onl_successes,
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unsigned long *sum_offl, int *min_onl, int *max_onl);
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bool torture_online(int cpu, long *n_onl_attempts, long *n_onl_successes,
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unsigned long *sum_onl, int *min_onl, int *max_onl);
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int torture_onoff_init(long ooholdoff, long oointerval, torture_ofl_func *f);
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void torture_onoff_stats(void);
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bool torture_onoff_failures(void);
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/* Low-rider random number generator. */
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struct torture_random_state {
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unsigned long trs_state;
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long trs_count;
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};
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#define DEFINE_TORTURE_RANDOM(name) struct torture_random_state name = { 0, 0 }
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#define DEFINE_TORTURE_RANDOM_PERCPU(name) \
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DEFINE_PER_CPU(struct torture_random_state, name)
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unsigned long torture_random(struct torture_random_state *trsp);
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static inline void torture_random_init(struct torture_random_state *trsp)
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{
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trsp->trs_state = 0;
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trsp->trs_count = 0;
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}
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/* Task shuffler, which causes CPUs to occasionally go idle. */
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void torture_shuffle_task_register(struct task_struct *tp);
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int torture_shuffle_init(long shuffint);
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/* Test auto-shutdown handling. */
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void torture_shutdown_absorb(const char *title);
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int torture_shutdown_init(int ssecs, void (*cleanup)(void));
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/* Task stuttering, which forces load/no-load transitions. */
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bool stutter_wait(const char *title);
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int torture_stutter_init(int s, int sgap);
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/* Initialization and cleanup. */
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bool torture_init_begin(char *ttype, int v);
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void torture_init_end(void);
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bool torture_cleanup_begin(void);
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void torture_cleanup_end(void);
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bool torture_must_stop(void);
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bool torture_must_stop_irq(void);
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void torture_kthread_stopping(char *title);
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int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
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char *f, struct task_struct **tp);
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void _torture_stop_kthread(char *m, struct task_struct **tp);
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#define torture_create_kthread(n, arg, tp) \
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_torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
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"Failed to create " #n, &(tp))
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#define torture_stop_kthread(n, tp) \
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_torture_stop_kthread("Stopping " #n " task", &(tp))
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#ifdef CONFIG_PREEMPTION
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#define torture_preempt_schedule() preempt_schedule()
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#else
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#define torture_preempt_schedule() do { } while (0)
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#endif
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#endif /* __LINUX_TORTURE_H */
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