From 630952c22b04ada7e88ad93b87ad893cd818cc6b Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Thu, 11 Sep 2014 21:42:25 -0700 Subject: [PATCH] locktorture: Introduce torture context The amount of global variables is getting pretty ugly. Group variables related to the execution (ie: not parameters) in a new context structure. Signed-off-by: Davidlohr Bueso Signed-off-by: Paul E. McKenney --- kernel/locking/locktorture.c | 161 ++++++++++++++++++----------------- 1 file changed, 82 insertions(+), 79 deletions(-) diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c index 8480118c0ca8..540d5dfe1112 100644 --- a/kernel/locking/locktorture.c +++ b/kernel/locking/locktorture.c @@ -66,29 +66,22 @@ torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); torture_param(bool, verbose, true, "Enable verbose debugging printk()s"); -static bool debug_lock = false; static char *torture_type = "spin_lock"; module_param(torture_type, charp, 0444); MODULE_PARM_DESC(torture_type, "Type of lock to torture (spin_lock, spin_lock_irq, mutex_lock, ...)"); -static atomic_t n_lock_torture_errors; - static struct task_struct *stats_task; static struct task_struct **writer_tasks; static struct task_struct **reader_tasks; -static int nrealwriters_stress; static bool lock_is_write_held; -static int nrealreaders_stress; static bool lock_is_read_held; struct lock_stress_stats { long n_lock_fail; long n_lock_acquired; }; -static struct lock_stress_stats *lwsa; /* writer statistics */ -static struct lock_stress_stats *lrsa; /* reader statistics */ #if defined(MODULE) #define LOCKTORTURE_RUNNABLE_INIT 1 @@ -117,8 +110,18 @@ struct lock_torture_ops { const char *name; }; -static struct lock_torture_ops *cur_ops; - +struct lock_torture_cxt { + int nrealwriters_stress; + int nrealreaders_stress; + bool debug_lock; + atomic_t n_lock_torture_errors; + struct lock_torture_ops *cur_ops; + struct lock_stress_stats *lwsa; /* writer statistics */ + struct lock_stress_stats *lrsa; /* reader statistics */ +}; +static struct lock_torture_cxt cxt = { 0, 0, false, + ATOMIC_INIT(0), + NULL, NULL}; /* * Definitions for lock torture testing. */ @@ -134,10 +137,10 @@ static void torture_lock_busted_write_delay(struct torture_random_state *trsp) /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % - (nrealwriters_stress * 2000 * longdelay_us))) + (cxt.nrealwriters_stress * 2000 * longdelay_us))) mdelay(longdelay_us); #ifdef CONFIG_PREEMPT - if (!(torture_random(trsp) % (nrealwriters_stress * 20000))) + if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } @@ -174,13 +177,13 @@ static void torture_spin_lock_write_delay(struct torture_random_state *trsp) * we want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % - (nrealwriters_stress * 2000 * longdelay_us))) + (cxt.nrealwriters_stress * 2000 * longdelay_us))) mdelay(longdelay_us); if (!(torture_random(trsp) % - (nrealwriters_stress * 2 * shortdelay_us))) + (cxt.nrealwriters_stress * 2 * shortdelay_us))) udelay(shortdelay_us); #ifdef CONFIG_PREEMPT - if (!(torture_random(trsp) % (nrealwriters_stress * 20000))) + if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } @@ -206,14 +209,14 @@ __acquires(torture_spinlock_irq) unsigned long flags; spin_lock_irqsave(&torture_spinlock, flags); - cur_ops->flags = flags; + cxt.cur_ops->flags = flags; return 0; } static void torture_lock_spin_write_unlock_irq(void) __releases(torture_spinlock) { - spin_unlock_irqrestore(&torture_spinlock, cur_ops->flags); + spin_unlock_irqrestore(&torture_spinlock, cxt.cur_ops->flags); } static struct lock_torture_ops spin_lock_irq_ops = { @@ -240,12 +243,12 @@ static void torture_mutex_delay(struct torture_random_state *trsp) /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % - (nrealwriters_stress * 2000 * longdelay_ms))) + (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms * 5); else mdelay(longdelay_ms / 5); #ifdef CONFIG_PREEMPT - if (!(torture_random(trsp) % (nrealwriters_stress * 20000))) + if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } @@ -278,12 +281,12 @@ static void torture_rwsem_write_delay(struct torture_random_state *trsp) /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % - (nrealwriters_stress * 2000 * longdelay_ms))) + (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms * 10); else mdelay(longdelay_ms / 10); #ifdef CONFIG_PREEMPT - if (!(torture_random(trsp) % (nrealwriters_stress * 20000))) + if (!(torture_random(trsp) % (cxt.nrealwriters_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } @@ -305,12 +308,12 @@ static void torture_rwsem_read_delay(struct torture_random_state *trsp) /* We want a long delay occasionally to force massive contention. */ if (!(torture_random(trsp) % - (nrealwriters_stress * 2000 * longdelay_ms))) + (cxt.nrealwriters_stress * 2000 * longdelay_ms))) mdelay(longdelay_ms * 2); else mdelay(longdelay_ms / 2); #ifdef CONFIG_PREEMPT - if (!(torture_random(trsp) % (nrealreaders_stress * 20000))) + if (!(torture_random(trsp) % (cxt.nrealreaders_stress * 20000))) preempt_schedule(); /* Allow test to be preempted. */ #endif } @@ -345,14 +348,14 @@ static int lock_torture_writer(void *arg) do { if ((torture_random(&rand) & 0xfffff) == 0) schedule_timeout_uninterruptible(1); - cur_ops->writelock(); + cxt.cur_ops->writelock(); if (WARN_ON_ONCE(lock_is_write_held)) lwsp->n_lock_fail++; lock_is_write_held = 1; lwsp->n_lock_acquired++; - cur_ops->write_delay(&rand); + cxt.cur_ops->write_delay(&rand); lock_is_write_held = 0; - cur_ops->writeunlock(); + cxt.cur_ops->writeunlock(); stutter_wait("lock_torture_writer"); } while (!torture_must_stop()); torture_kthread_stopping("lock_torture_writer"); @@ -374,12 +377,12 @@ static int lock_torture_reader(void *arg) do { if ((torture_random(&rand) & 0xfffff) == 0) schedule_timeout_uninterruptible(1); - cur_ops->readlock(); + cxt.cur_ops->readlock(); lock_is_read_held = 1; lrsp->n_lock_acquired++; - cur_ops->read_delay(&rand); + cxt.cur_ops->read_delay(&rand); lock_is_read_held = 0; - cur_ops->readunlock(); + cxt.cur_ops->readunlock(); stutter_wait("lock_torture_reader"); } while (!torture_must_stop()); torture_kthread_stopping("lock_torture_reader"); @@ -398,7 +401,7 @@ static void __torture_print_stats(char *page, long min = statp[0].n_lock_acquired; long long sum = 0; - n_stress = write ? nrealwriters_stress : nrealreaders_stress; + n_stress = write ? cxt.nrealwriters_stress : cxt.nrealreaders_stress; for (i = 0; i < n_stress; i++) { if (statp[i].n_lock_fail) fail = true; @@ -414,7 +417,7 @@ static void __torture_print_stats(char *page, sum, max, min, max / 2 > min ? "???" : "", fail, fail ? "!!!" : ""); if (fail) - atomic_inc(&n_lock_torture_errors); + atomic_inc(&cxt.n_lock_torture_errors); } /* @@ -427,11 +430,11 @@ static void __torture_print_stats(char *page, */ static void lock_torture_stats_print(void) { - int size = nrealwriters_stress * 200 + 8192; + int size = cxt.nrealwriters_stress * 200 + 8192; char *buf; - if (cur_ops->readlock) - size += nrealreaders_stress * 200 + 8192; + if (cxt.cur_ops->readlock) + size += cxt.nrealreaders_stress * 200 + 8192; buf = kmalloc(size, GFP_KERNEL); if (!buf) { @@ -440,11 +443,11 @@ static void lock_torture_stats_print(void) return; } - __torture_print_stats(buf, lwsa, true); + __torture_print_stats(buf, cxt.lwsa, true); pr_alert("%s", buf); kfree(buf); - if (cur_ops->readlock) { + if (cxt.cur_ops->readlock) { buf = kmalloc(size, GFP_KERNEL); if (!buf) { pr_err("lock_torture_stats_print: Out of memory, need: %d", @@ -452,7 +455,7 @@ static void lock_torture_stats_print(void) return; } - __torture_print_stats(buf, lrsa, false); + __torture_print_stats(buf, cxt.lrsa, false); pr_alert("%s", buf); kfree(buf); } @@ -483,8 +486,8 @@ lock_torture_print_module_parms(struct lock_torture_ops *cur_ops, { pr_alert("%s" TORTURE_FLAG "--- %s%s: nwriters_stress=%d nreaders_stress=%d stat_interval=%d verbose=%d shuffle_interval=%d stutter=%d shutdown_secs=%d onoff_interval=%d onoff_holdoff=%d\n", - torture_type, tag, debug_lock ? " [debug]": "", - nrealwriters_stress, nrealreaders_stress, stat_interval, + torture_type, tag, cxt.debug_lock ? " [debug]": "", + cxt.nrealwriters_stress, cxt.nrealreaders_stress, stat_interval, verbose, shuffle_interval, stutter, shutdown_secs, onoff_interval, onoff_holdoff); } @@ -497,7 +500,7 @@ static void lock_torture_cleanup(void) return; if (writer_tasks) { - for (i = 0; i < nrealwriters_stress; i++) + for (i = 0; i < cxt.nrealwriters_stress; i++) torture_stop_kthread(lock_torture_writer, writer_tasks[i]); kfree(writer_tasks); @@ -505,7 +508,7 @@ static void lock_torture_cleanup(void) } if (reader_tasks) { - for (i = 0; i < nrealreaders_stress; i++) + for (i = 0; i < cxt.nrealreaders_stress; i++) torture_stop_kthread(lock_torture_reader, reader_tasks[i]); kfree(reader_tasks); @@ -515,14 +518,14 @@ static void lock_torture_cleanup(void) torture_stop_kthread(lock_torture_stats, stats_task); lock_torture_stats_print(); /* -After- the stats thread is stopped! */ - if (atomic_read(&n_lock_torture_errors)) - lock_torture_print_module_parms(cur_ops, + if (atomic_read(&cxt.n_lock_torture_errors)) + lock_torture_print_module_parms(cxt.cur_ops, "End of test: FAILURE"); else if (torture_onoff_failures()) - lock_torture_print_module_parms(cur_ops, + lock_torture_print_module_parms(cxt.cur_ops, "End of test: LOCK_HOTPLUG"); else - lock_torture_print_module_parms(cur_ops, + lock_torture_print_module_parms(cxt.cur_ops, "End of test: SUCCESS"); torture_cleanup_end(); } @@ -541,8 +544,8 @@ static int __init lock_torture_init(void) /* Process args and tell the world that the torturer is on the job. */ for (i = 0; i < ARRAY_SIZE(torture_ops); i++) { - cur_ops = torture_ops[i]; - if (strcmp(torture_type, cur_ops->name) == 0) + cxt.cur_ops = torture_ops[i]; + if (strcmp(torture_type, cxt.cur_ops->name) == 0) break; } if (i == ARRAY_SIZE(torture_ops)) { @@ -555,40 +558,40 @@ static int __init lock_torture_init(void) torture_init_end(); return -EINVAL; } - if (cur_ops->init) - cur_ops->init(); /* no "goto unwind" prior to this point!!! */ + if (cxt.cur_ops->init) + cxt.cur_ops->init(); /* no "goto unwind" prior to this point!!! */ if (nwriters_stress >= 0) - nrealwriters_stress = nwriters_stress; + cxt.nrealwriters_stress = nwriters_stress; else - nrealwriters_stress = 2 * num_online_cpus(); + cxt.nrealwriters_stress = 2 * num_online_cpus(); #ifdef CONFIG_DEBUG_MUTEXES if (strncmp(torture_type, "mutex", 5) == 0) - debug_lock = true; + cxt.debug_lock = true; #endif #ifdef CONFIG_DEBUG_SPINLOCK if (strncmp(torture_type, "spin", 4) == 0) - debug_lock = true; + cxt.debug_lock = true; #endif /* Initialize the statistics so that each run gets its own numbers. */ lock_is_write_held = 0; - lwsa = kmalloc(sizeof(*lwsa) * nrealwriters_stress, GFP_KERNEL); - if (lwsa == NULL) { - VERBOSE_TOROUT_STRING("lwsa: Out of memory"); + cxt.lwsa = kmalloc(sizeof(*cxt.lwsa) * cxt.nrealwriters_stress, GFP_KERNEL); + if (cxt.lwsa == NULL) { + VERBOSE_TOROUT_STRING("cxt.lwsa: Out of memory"); firsterr = -ENOMEM; goto unwind; } - for (i = 0; i < nrealwriters_stress; i++) { - lwsa[i].n_lock_fail = 0; - lwsa[i].n_lock_acquired = 0; + for (i = 0; i < cxt.nrealwriters_stress; i++) { + cxt.lwsa[i].n_lock_fail = 0; + cxt.lwsa[i].n_lock_acquired = 0; } - if (cur_ops->readlock) { + if (cxt.cur_ops->readlock) { if (nreaders_stress >= 0) - nrealreaders_stress = nreaders_stress; + cxt.nrealreaders_stress = nreaders_stress; else { /* * By default distribute evenly the number of @@ -596,25 +599,25 @@ static int __init lock_torture_init(void) * of threads as the writer-only locks default. */ if (nwriters_stress < 0) /* user doesn't care */ - nrealwriters_stress = num_online_cpus(); - nrealreaders_stress = nrealwriters_stress; + cxt.nrealwriters_stress = num_online_cpus(); + cxt.nrealreaders_stress = cxt.nrealwriters_stress; } lock_is_read_held = 0; - lrsa = kmalloc(sizeof(*lrsa) * nrealreaders_stress, GFP_KERNEL); - if (lrsa == NULL) { - VERBOSE_TOROUT_STRING("lrsa: Out of memory"); + cxt.lrsa = kmalloc(sizeof(*cxt.lrsa) * cxt.nrealreaders_stress, GFP_KERNEL); + if (cxt.lrsa == NULL) { + VERBOSE_TOROUT_STRING("cxt.lrsa: Out of memory"); firsterr = -ENOMEM; - kfree(lwsa); + kfree(cxt.lwsa); goto unwind; } - for (i = 0; i < nrealreaders_stress; i++) { - lrsa[i].n_lock_fail = 0; - lrsa[i].n_lock_acquired = 0; + for (i = 0; i < cxt.nrealreaders_stress; i++) { + cxt.lrsa[i].n_lock_fail = 0; + cxt.lrsa[i].n_lock_acquired = 0; } } - lock_torture_print_module_parms(cur_ops, "Start of test"); + lock_torture_print_module_parms(cxt.cur_ops, "Start of test"); /* Prepare torture context. */ if (onoff_interval > 0) { @@ -640,7 +643,7 @@ static int __init lock_torture_init(void) goto unwind; } - writer_tasks = kzalloc(nrealwriters_stress * sizeof(writer_tasks[0]), + writer_tasks = kzalloc(cxt.nrealwriters_stress * sizeof(writer_tasks[0]), GFP_KERNEL); if (writer_tasks == NULL) { VERBOSE_TOROUT_ERRSTRING("writer_tasks: Out of memory"); @@ -648,8 +651,8 @@ static int __init lock_torture_init(void) goto unwind; } - if (cur_ops->readlock) { - reader_tasks = kzalloc(nrealreaders_stress * sizeof(reader_tasks[0]), + if (cxt.cur_ops->readlock) { + reader_tasks = kzalloc(cxt.nrealreaders_stress * sizeof(reader_tasks[0]), GFP_KERNEL); if (reader_tasks == NULL) { VERBOSE_TOROUT_ERRSTRING("reader_tasks: Out of memory"); @@ -666,22 +669,22 @@ static int __init lock_torture_init(void) * for very specific needs, or even let the user choose the policy, if * ever wanted. */ - for (i = 0, j = 0; i < nrealwriters_stress || - j < nrealreaders_stress; i++, j++) { - if (i >= nrealwriters_stress) + for (i = 0, j = 0; i < cxt.nrealwriters_stress || + j < cxt.nrealreaders_stress; i++, j++) { + if (i >= cxt.nrealwriters_stress) goto create_reader; /* Create writer. */ - firsterr = torture_create_kthread(lock_torture_writer, &lwsa[i], + firsterr = torture_create_kthread(lock_torture_writer, &cxt.lwsa[i], writer_tasks[i]); if (firsterr) goto unwind; create_reader: - if (cur_ops->readlock == NULL || (j >= nrealreaders_stress)) + if (cxt.cur_ops->readlock == NULL || (j >= cxt.nrealreaders_stress)) continue; /* Create reader. */ - firsterr = torture_create_kthread(lock_torture_reader, &lrsa[j], + firsterr = torture_create_kthread(lock_torture_reader, &cxt.lrsa[j], reader_tasks[j]); if (firsterr) goto unwind; -- 2.30.2