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474e59b476
The rcu_torture_writer() function invokes stutter_wait() at the end of each writer pass, which occasionally blocks for an extended time period in order to ensure that RCU can handle intermittent loads. But part of handling a busy period is invoking all the callbacks before the end of the idle period induced by stutter_wait(). This commit therefore adds a return value to stutter_wait() indicating whether stutter_wait() actually waited. In addition, this commit causes rcu_torture_writer() to test this value and if set, checks that all the elements of the rcu_tortures[] array have been freed up. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
108 lines
3.8 KiB
C
108 lines
3.8 KiB
C
/*
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* Common functions for in-kernel torture tests.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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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.vnet.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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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);
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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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/* 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);
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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_PREEMPT
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#define torture_preempt_schedule() preempt_schedule()
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#else
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#define torture_preempt_schedule()
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#endif
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#endif /* __LINUX_TORTURE_H */
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