+++ /dev/null
-/* test-wbias-rwlock.c
- *
- */
-
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/sched.h>
-#include <linux/timex.h>
-#include <linux/kthread.h>
-#include <linux/delay.h>
-#include <linux/hardirq.h>
-#include <linux/module.h>
-#include <linux/percpu.h>
-#include <linux/spinlock.h>
-#include <asm/ptrace.h>
-#include <linux/wbias-rwlock.h>
-
-/* Test with no contention duration, in seconds */
-#define SINGLE_WRITER_TEST_DURATION 10
-#define SINGLE_READER_TEST_DURATION 10
-#define MULTIPLE_READERS_TEST_DURATION 10
-
-/* Test duration, in seconds */
-#define TEST_DURATION 60
-
-#define NR_VARS 100
-#define NR_WRITERS 2
-#define NR_TRYLOCK_WRITERS 1
-#define NR_NPREADERS 2
-#define NR_TRYLOCK_READERS 1
-
-/*
- * 1 : test standard rwlock
- * 0 : test wbiasrwlock
- */
-#define TEST_STD_RWLOCK 0
-
-/*
- * 1 : test with thread and interrupt readers.
- * 0 : test only with thread readers.
- */
-#define TEST_INTERRUPTS 1
-
-#if (TEST_INTERRUPTS)
-#define NR_INTERRUPT_READERS 1
-#define NR_TRYLOCK_INTERRUPT_READERS 1
-#else
-#define NR_INTERRUPT_READERS 0
-#define NR_TRYLOCK_INTERRUPT_READERS 0
-#endif
-
-/*
- * 1 : test with thread preemption readers.
- * 0 : test only with non-preemptable thread readers.
- */
-#define TEST_PREEMPT 1
-
-#if (TEST_PREEMPT)
-#define NR_PREADERS 2
-#else
-#define NR_PREADERS 0
-#endif
-
-
-/*
- * Writer iteration delay, in us. 0 for busy loop. Caution : writers can
- * starve readers.
- */
-#define WRITER_DELAY 100
-#define TRYLOCK_WRITER_DELAY 1000
-
-/*
- * Number of iterations after which a trylock writer fails.
- * -1 for infinite loop.
- */
-#define TRYLOCK_WRITERS_FAIL_ITER 100
-
-/* Thread and interrupt reader delay, in ms */
-#define THREAD_READER_DELAY 0 /* busy loop */
-#define INTERRUPT_READER_DELAY 100
-
-#ifdef CONFIG_PREEMPT
-#define yield_in_non_preempt()
-#else
-#define yield_in_non_preempt() yield()
-#endif
-
-static int var[NR_VARS];
-static struct task_struct *preader_threads[NR_PREADERS];
-static struct task_struct *npreader_threads[NR_NPREADERS];
-static struct task_struct *trylock_reader_threads[NR_TRYLOCK_READERS];
-static struct task_struct *writer_threads[NR_WRITERS];
-static struct task_struct *trylock_writer_threads[NR_TRYLOCK_WRITERS];
-static struct task_struct *interrupt_reader[NR_INTERRUPT_READERS];
-static struct task_struct *trylock_interrupt_reader[NR_TRYLOCK_INTERRUPT_READERS];
-
-#if (TEST_STD_RWLOCK)
-
-static DEFINE_RWLOCK(std_rw_lock);
-
-#define wrap_read_lock() read_lock(&std_rw_lock)
-#define wrap_read_trylock() read_trylock(&std_rw_lock)
-#define wrap_read_unlock() read_unlock(&std_rw_lock)
-
-#define wrap_read_lock_inatomic() read_lock(&std_rw_lock)
-#define wrap_read_trylock_inatomic() read_trylock(&std_rw_lock)
-
-#define wrap_read_lock_irq() read_lock(&std_rw_lock)
-#define wrap_read_trylock_irq() read_trylock(&std_rw_lock)
-
-#if (TEST_INTERRUPTS)
-#define wrap_write_lock() write_lock_irq(&std_rw_lock)
-#define wrap_write_unlock() write_unlock_irq(&std_rw_lock)
-#else
-#define wrap_write_lock() write_lock(&std_rw_lock)
-#define wrap_write_unlock() write_unlock(&std_rw_lock)
-#endif
-
-#define wrap_write_trylock() write_trylock(&std_rw_lock)
-
-#else
-
-#if (TEST_INTERRUPTS)
-#if (TEST_PREEMPT)
-#define WBIASRWLOCKWCTX WB_PRIO_P
-#define WBIASRWLOCKRCTX (WB_RIRQ | WB_RNPTHREAD | WB_RPTHREAD)
-#else
-#define WBIASRWLOCKWCTX WB_PRIO_NP
-#define WBIASRWLOCKRCTX (WB_RIRQ | WB_RNPTHREAD)
-#endif
-#else
-#if (TEST_PREEMPT)
-#define WBIASRWLOCKWCTX WB_PRIO_P
-#define WBIASRWLOCKRCTX (WB_RNPTHREAD | WB_RPTHREAD)
-#else
-#define WBIASRWLOCKWCTX WB_PRIO_NP
-#define WBIASRWLOCKRCTX (WB_RNPTHREAD)
-#endif
-#endif
-
-static DEFINE_WBIAS_RWLOCK(wbiasrwlock, WBIASRWLOCKWCTX, WBIASRWLOCKRCTX);
-CHECK_WBIAS_RWLOCK_MAP(wbiasrwlock, WBIASRWLOCKWCTX, WBIASRWLOCKRCTX);
-
-
-#if (TEST_PREEMPT)
-#define wrap_read_lock() wbias_read_lock(&wbiasrwlock)
-#define wrap_read_trylock() wbias_read_trylock(&wbiasrwlock)
-#else
-#define wrap_read_lock() wbias_read_lock_inatomic(&wbiasrwlock)
-#define wrap_read_trylock() wbias_read_trylock_inatomic(&wbiasrwlock)
-#endif
-#define wrap_read_unlock() wbias_read_unlock(&wbiasrwlock)
-
-#define wrap_read_lock_inatomic() wbias_read_lock_inatomic(&wbiasrwlock)
-#define wrap_read_trylock_inatomic() \
- wbias_read_trylock_inatomic(&wbiasrwlock)
-
-#define wrap_read_lock_irq() wbias_read_lock_irq(&wbiasrwlock)
-#define wrap_read_trylock_irq() wbias_read_trylock_irq(&wbiasrwlock)
-
-#define wrap_write_lock() \
- wbias_write_lock(&wbiasrwlock, WBIASRWLOCKWCTX, WBIASRWLOCKRCTX)
-#define wrap_write_unlock() \
- wbias_write_unlock(&wbiasrwlock, WBIASRWLOCKWCTX, WBIASRWLOCKRCTX)
-#define wrap_write_trylock() \
- wbias_write_trylock(&wbiasrwlock, WBIASRWLOCKWCTX, WBIASRWLOCKRCTX)
-
-#endif
-
-static cycles_t cycles_calibration_min,
- cycles_calibration_avg,
- cycles_calibration_max;
-
-static inline cycles_t calibrate_cycles(cycles_t cycles)
-{
- return cycles - cycles_calibration_avg;
-}
-
-struct proc_dir_entry *pentry = NULL;
-
-static int p_or_np_reader_thread(const char *typename,
- void *data, int preemptable)
-{
- int i;
- int prev, cur;
- unsigned long iter = 0;
- cycles_t time1, time2, delay;
- cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0;
- cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0;
-
- printk("%s/%lu runnning\n", typename, (unsigned long)data);
- do {
- iter++;
- if (!preemptable)
- preempt_disable();
- rdtsc_barrier();
- time1 = get_cycles();
- rdtsc_barrier();
-
- if (!preemptable)
- wrap_read_lock_inatomic();
- else
- wrap_read_lock();
-
- rdtsc_barrier();
- time2 = get_cycles();
- rdtsc_barrier();
- delay = time2 - time1;
- ldelaymax = max(ldelaymax, delay);
- ldelaymin = min(ldelaymin, delay);
- ldelayavg += delay;
- prev = var[0];
- for (i = 1; i < NR_VARS; i++) {
- cur = var[i];
- if (cur != prev) {
- printk(KERN_ALERT
- "Unequal cur %d/prev %d at i %d, iter %lu "
- "in reader thread\n",
- cur, prev, i, iter);
- }
- }
-
- rdtsc_barrier();
- time1 = get_cycles();
- rdtsc_barrier();
-
- wrap_read_unlock();
-
- rdtsc_barrier();
- time2 = get_cycles();
- rdtsc_barrier();
- delay = time2 - time1;
- udelaymax = max(udelaymax, delay);
- udelaymin = min(udelaymin, delay);
- udelayavg += delay;
-
- if (!preemptable)
- preempt_enable();
-
- if (THREAD_READER_DELAY)
- msleep(THREAD_READER_DELAY);
- yield_in_non_preempt();
- } while (!kthread_should_stop());
- if (!iter) {
- printk("%s/%lu iterations : %lu", typename,
- (unsigned long)data, iter);
- } else {
- ldelayavg /= iter;
- udelayavg /= iter;
- printk("%s/%lu iterations : %lu, "
- "lock delay [min,avg,max] %llu,%llu,%llu cycles\n",
- typename,
- (unsigned long)data, iter,
- calibrate_cycles(ldelaymin),
- calibrate_cycles(ldelayavg),
- calibrate_cycles(ldelaymax));
- printk("%s/%lu iterations : %lu, "
- "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n",
- typename,
- (unsigned long)data, iter,
- calibrate_cycles(udelaymin),
- calibrate_cycles(udelayavg),
- calibrate_cycles(udelaymax));
- }
- return 0;
-}
-
-static int preader_thread(void *data)
-{
- return p_or_np_reader_thread("preader_thread", data, 1);
-}
-
-static int npreader_thread(void *data)
-{
- return p_or_np_reader_thread("npreader_thread", data, 0);
-}
-
-static int trylock_reader_thread(void *data)
-{
- int i;
- int prev, cur;
- unsigned long iter = 0, success_iter = 0;
-
- printk("trylock_reader_thread/%lu runnning\n", (unsigned long)data);
- do {
-#if (!TEST_PREEMPT)
- preempt_disable();
-#endif
- while (!wrap_read_trylock()) {
- cpu_relax();
- iter++;
- }
- success_iter++;
- prev = var[0];
- for (i = 1; i < NR_VARS; i++) {
- cur = var[i];
- if (cur != prev) {
- printk(KERN_ALERT
- "Unequal cur %d/prev %d at i %d, iter %lu "
- "in trylock reader thread\n",
- cur, prev, i, iter);
- }
- }
- wrap_read_unlock();
-#if (!TEST_PREEMPT)
- preempt_enable();
-#endif
- if (THREAD_READER_DELAY)
- msleep(THREAD_READER_DELAY);
- yield_in_non_preempt();
- } while (!kthread_should_stop());
- printk("trylock_reader_thread/%lu iterations : %lu, "
- "successful iterations : %lu\n",
- (unsigned long)data, iter + success_iter, success_iter);
- return 0;
-}
-
-DEFINE_PER_CPU(cycles_t, int_ldelaymin);
-DEFINE_PER_CPU(cycles_t, int_ldelayavg);
-DEFINE_PER_CPU(cycles_t, int_ldelaymax);
-DEFINE_PER_CPU(cycles_t, int_udelaymin);
-DEFINE_PER_CPU(cycles_t, int_udelayavg);
-DEFINE_PER_CPU(cycles_t, int_udelaymax);
-DEFINE_PER_CPU(cycles_t, int_ipi_nr);
-
-static void interrupt_reader_ipi(void *data)
-{
- int i;
- int prev, cur;
- cycles_t time1, time2;
- cycles_t *ldelaymax, *ldelaymin, *ldelayavg, *ipi_nr, delay;
- cycles_t *udelaymax, *udelaymin, *udelayavg;
-
- /*
- * Skip the ipi caller, not in irq context.
- */
- if (!in_irq())
- return;
-
- ldelaymax = &per_cpu(int_ldelaymax, smp_processor_id());
- ldelaymin = &per_cpu(int_ldelaymin, smp_processor_id());
- ldelayavg = &per_cpu(int_ldelayavg, smp_processor_id());
- udelaymax = &per_cpu(int_udelaymax, smp_processor_id());
- udelaymin = &per_cpu(int_udelaymin, smp_processor_id());
- udelayavg = &per_cpu(int_udelayavg, smp_processor_id());
- ipi_nr = &per_cpu(int_ipi_nr, smp_processor_id());
-
- rdtsc_barrier();
- time1 = get_cycles();
- rdtsc_barrier();
-
- wrap_read_lock_irq();
-
- rdtsc_barrier();
- time2 = get_cycles();
- rdtsc_barrier();
- delay = time2 - time1;
- *ldelaymax = max(*ldelaymax, delay);
- *ldelaymin = min(*ldelaymin, delay);
- *ldelayavg += delay;
- (*ipi_nr)++;
- prev = var[0];
- for (i = 1; i < NR_VARS; i++) {
- cur = var[i];
- if (cur != prev)
- printk(KERN_ALERT
- "Unequal cur %d/prev %d at i %d in interrupt\n",
- cur, prev, i);
- }
- rdtsc_barrier();
- time1 = get_cycles();
- rdtsc_barrier();
- wrap_read_unlock();
- time2 = get_cycles();
- rdtsc_barrier();
- delay = time2 - time1;
- *udelaymax = max(*udelaymax, delay);
- *udelaymin = min(*udelaymin, delay);
- *udelayavg += delay;
-}
-
-DEFINE_PER_CPU(unsigned long, trylock_int_iter);
-DEFINE_PER_CPU(unsigned long, trylock_int_success);
-
-static void trylock_interrupt_reader_ipi(void *data)
-{
- int i;
- int prev, cur;
-
- /*
- * Skip the ipi caller, not in irq context.
- */
- if (!in_irq())
- return;
-
- per_cpu(trylock_int_iter, smp_processor_id())++;
- while (!wrap_read_trylock_irq())
- per_cpu(trylock_int_iter, smp_processor_id())++;
- per_cpu(trylock_int_success, smp_processor_id())++;
- prev = var[0];
- for (i = 1; i < NR_VARS; i++) {
- cur = var[i];
- if (cur != prev)
- printk(KERN_ALERT
- "Unequal cur %d/prev %d at i %d in interrupt\n",
- cur, prev, i);
- }
- wrap_read_unlock();
-}
-
-
-static int interrupt_reader_thread(void *data)
-{
- unsigned long iter = 0;
- int i;
-
- for_each_online_cpu(i) {
- per_cpu(int_ldelaymax, i) = 0;
- per_cpu(int_ldelaymin, i) = ULLONG_MAX;
- per_cpu(int_ldelayavg, i) = 0;
- per_cpu(int_udelaymax, i) = 0;
- per_cpu(int_udelaymin, i) = ULLONG_MAX;
- per_cpu(int_udelayavg, i) = 0;
- per_cpu(int_ipi_nr, i) = 0;
- }
- do {
- iter++;
- on_each_cpu(interrupt_reader_ipi, NULL, 0);
- if (INTERRUPT_READER_DELAY)
- msleep(INTERRUPT_READER_DELAY);
- yield_in_non_preempt();
- } while (!kthread_should_stop());
- printk("interrupt_reader_thread/%lu iterations : %lu\n",
- (unsigned long)data, iter);
- for_each_online_cpu(i) {
- if (!per_cpu(int_ipi_nr, i))
- continue;
- per_cpu(int_ldelayavg, i) /= per_cpu(int_ipi_nr, i);
- per_cpu(int_udelayavg, i) /= per_cpu(int_ipi_nr, i);
- printk("interrupt readers on CPU %i, "
- "lock delay [min,avg,max] %llu,%llu,%llu cycles\n",
- i,
- calibrate_cycles(per_cpu(int_ldelaymin, i)),
- calibrate_cycles(per_cpu(int_ldelayavg, i)),
- calibrate_cycles(per_cpu(int_ldelaymax, i)));
- printk("interrupt readers on CPU %i, "
- "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n",
- i,
- calibrate_cycles(per_cpu(int_udelaymin, i)),
- calibrate_cycles(per_cpu(int_udelayavg, i)),
- calibrate_cycles(per_cpu(int_udelaymax, i)));
- }
- return 0;
-}
-
-static int trylock_interrupt_reader_thread(void *data)
-{
- unsigned long iter = 0;
- int i;
-
- do {
- iter++;
- on_each_cpu(trylock_interrupt_reader_ipi, NULL, 0);
- if (INTERRUPT_READER_DELAY)
- msleep(INTERRUPT_READER_DELAY);
- yield_in_non_preempt();
- } while (!kthread_should_stop());
- printk("trylock_interrupt_reader_thread/%lu iterations : %lu\n",
- (unsigned long)data, iter);
- for_each_online_cpu(i) {
- printk("trylock interrupt readers on CPU %i, "
- "iterations %lu, "
- "successful iterations : %lu\n",
- i, per_cpu(trylock_int_iter, i),
- per_cpu(trylock_int_success, i));
- per_cpu(trylock_int_iter, i) = 0;
- per_cpu(trylock_int_success, i) = 0;
- }
- return 0;
-}
-
-static int writer_thread(void *data)
-{
- int i;
- int new, prev, cur;
- unsigned long iter = 0;
- cycles_t time1, time2, delay;
- cycles_t ldelaymax = 0, ldelaymin = ULLONG_MAX, ldelayavg = 0;
- cycles_t udelaymax = 0, udelaymin = ULLONG_MAX, udelayavg = 0;
-
- printk("writer_thread/%lu runnning\n", (unsigned long)data);
- do {
- iter++;
-#if (!TEST_PREEMPT)
- preempt_disable();
-#endif
- rdtsc_barrier();
- time1 = get_cycles();
- rdtsc_barrier();
-
- wrap_write_lock();
-
- rdtsc_barrier();
- time2 = get_cycles();
- rdtsc_barrier();
- delay = time2 - time1;
- ldelaymax = max(ldelaymax, delay);
- ldelaymin = min(ldelaymin, delay);
- ldelayavg += delay;
- /*
- * Read the previous values, check that they are coherent.
- */
- prev = var[0];
- for (i = 1; i < NR_VARS; i++) {
- cur = var[i];
- if (cur != prev)
- printk(KERN_ALERT
- "Unequal cur %d/prev %d at i %d, iter %lu "
- "in writer thread\n",
- cur, prev, i, iter);
- }
- new = (int)get_cycles();
- for (i = 0; i < NR_VARS; i++) {
- var[i] = new;
- }
-
- rdtsc_barrier();
- time1 = get_cycles();
- rdtsc_barrier();
-
- wrap_write_unlock();
-
- rdtsc_barrier();
- time2 = get_cycles();
- rdtsc_barrier();
- delay = time2 - time1;
- udelaymax = max(udelaymax, delay);
- udelaymin = min(udelaymin, delay);
- udelayavg += delay;
-
-#if (!TEST_PREEMPT)
- preempt_enable();
-#endif
- if (WRITER_DELAY > 0)
- udelay(WRITER_DELAY);
- cpu_relax(); /*
- * make sure we don't busy-loop faster than
- * the lock busy-loop, it would cause reader and
- * writer starvation.
- */
- yield_in_non_preempt();
- } while (!kthread_should_stop());
- ldelayavg /= iter;
- udelayavg /= iter;
- printk("writer_thread/%lu iterations : %lu, "
- "lock delay [min,avg,max] %llu,%llu,%llu cycles\n",
- (unsigned long)data, iter,
- calibrate_cycles(ldelaymin),
- calibrate_cycles(ldelayavg),
- calibrate_cycles(ldelaymax));
- printk("writer_thread/%lu iterations : %lu, "
- "unlock delay [min,avg,max] %llu,%llu,%llu cycles\n",
- (unsigned long)data, iter,
- calibrate_cycles(udelaymin),
- calibrate_cycles(udelayavg),
- calibrate_cycles(udelaymax));
- return 0;
-}
-
-static int trylock_writer_thread(void *data)
-{
- int i;
- int new;
- unsigned long iter = 0, success = 0, fail = 0;
-
- printk("trylock_writer_thread/%lu runnning\n", (unsigned long)data);
- do {
-#if ((!TEST_PREEMPT) && (!TEST_STD_RWLOCK))
- preempt_disable();
-#endif
-
-#if (TEST_STD_RWLOCK && TEST_INTERRUPTS)
- /* std write trylock cannot disable interrupts. */
- local_irq_disable();
-#endif
-
-#if (TRYLOCK_WRITERS_FAIL_ITER == -1)
- for (;;) {
- iter++;
- if (wrap_write_trylock())
- goto locked;
- cpu_relax();
- }
-#else
- for (i = 0; i < TRYLOCK_WRITERS_FAIL_ITER; i++) {
- iter++;
- if (wrap_write_trylock())
- goto locked;
- cpu_relax();
- }
-#endif
- fail++;
-
-#if (TEST_STD_RWLOCK && TEST_INTERRUPTS)
- local_irq_enable();
-#endif
-
-#if ((!TEST_PREEMPT) && (!TEST_STD_RWLOCK))
- preempt_enable();
-#endif
- goto loop;
-locked:
- success++;
- new = (int)get_cycles();
- for (i = 0; i < NR_VARS; i++) {
- var[i] = new;
- }
- wrap_write_unlock();
-#if ((!TEST_PREEMPT) && (!TEST_STD_RWLOCK))
- preempt_enable();
-#endif
-loop:
- if (TRYLOCK_WRITER_DELAY > 0)
- udelay(TRYLOCK_WRITER_DELAY);
- cpu_relax(); /*
- * make sure we don't busy-loop faster than
- * the lock busy-loop, it would cause reader and
- * writer starvation.
- */
- yield_in_non_preempt();
- } while (!kthread_should_stop());
- printk("trylock_writer_thread/%lu iterations : "
- "[try,success,fail after %d try], "
- "%lu,%lu,%lu\n",
- (unsigned long)data, TRYLOCK_WRITERS_FAIL_ITER,
- iter, success, fail);
- return 0;
-}
-
-static void wbias_rwlock_create(void)
-{
- unsigned long i;
-
- for (i = 0; i < NR_PREADERS; i++) {
- printk("starting preemptable reader thread %lu\n", i);
- preader_threads[i] = kthread_run(preader_thread, (void *)i,
- "wbiasrwlock_preader");
- BUG_ON(!preader_threads[i]);
- }
-
- for (i = 0; i < NR_NPREADERS; i++) {
- printk("starting non-preemptable reader thread %lu\n", i);
- npreader_threads[i] = kthread_run(npreader_thread, (void *)i,
- "wbiasrwlock_npreader");
- BUG_ON(!npreader_threads[i]);
- }
-
- for (i = 0; i < NR_TRYLOCK_READERS; i++) {
- printk("starting trylock reader thread %lu\n", i);
- trylock_reader_threads[i] = kthread_run(trylock_reader_thread,
- (void *)i, "wbiasrwlock_trylock_reader");
- BUG_ON(!trylock_reader_threads[i]);
- }
- for (i = 0; i < NR_INTERRUPT_READERS; i++) {
- printk("starting interrupt reader %lu\n", i);
- interrupt_reader[i] = kthread_run(interrupt_reader_thread,
- (void *)i,
- "wbiasrwlock_interrupt_reader");
- }
- for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++) {
- printk("starting trylock interrupt reader %lu\n", i);
- trylock_interrupt_reader[i] =
- kthread_run(trylock_interrupt_reader_thread,
- (void *)i, "wbiasrwlock_trylock_interrupt_reader");
- }
- for (i = 0; i < NR_WRITERS; i++) {
- printk("starting writer thread %lu\n", i);
- writer_threads[i] = kthread_run(writer_thread, (void *)i,
- "wbiasrwlock_writer");
- BUG_ON(!writer_threads[i]);
- }
- for (i = 0; i < NR_TRYLOCK_WRITERS; i++) {
- printk("starting trylock writer thread %lu\n", i);
- trylock_writer_threads[i] = kthread_run(trylock_writer_thread,
- (void *)i, "wbiasrwlock_trylock_writer");
- BUG_ON(!trylock_writer_threads[i]);
- }
-}
-
-static void wbias_rwlock_stop(void)
-{
- unsigned long i;
-
- for (i = 0; i < NR_WRITERS; i++)
- kthread_stop(writer_threads[i]);
- for (i = 0; i < NR_TRYLOCK_WRITERS; i++)
- kthread_stop(trylock_writer_threads[i]);
- for (i = 0; i < NR_NPREADERS; i++)
- kthread_stop(npreader_threads[i]);
- for (i = 0; i < NR_PREADERS; i++)
- kthread_stop(preader_threads[i]);
- for (i = 0; i < NR_TRYLOCK_READERS; i++)
- kthread_stop(trylock_reader_threads[i]);
- for (i = 0; i < NR_INTERRUPT_READERS; i++)
- kthread_stop(interrupt_reader[i]);
- for (i = 0; i < NR_TRYLOCK_INTERRUPT_READERS; i++)
- kthread_stop(trylock_interrupt_reader[i]);
-}
-
-
-static void perform_test(const char *name, void (*callback)(void))
-{
- printk("%s\n", name);
- callback();
-}
-
-static int my_open(struct inode *inode, struct file *file)
-{
- unsigned long i;
- cycles_t time1, time2, delay;
-
- printk("** get_cycles calibration **\n");
- cycles_calibration_min = ULLONG_MAX;
- cycles_calibration_avg = 0;
- cycles_calibration_max = 0;
-
- local_irq_disable();
- for (i = 0; i < 10; i++) {
- rdtsc_barrier();
- time1 = get_cycles();
- rdtsc_barrier();
- rdtsc_barrier();
- time2 = get_cycles();
- rdtsc_barrier();
- delay = time2 - time1;
- cycles_calibration_min = min(cycles_calibration_min, delay);
- cycles_calibration_avg += delay;
- cycles_calibration_max = max(cycles_calibration_max, delay);
- }
- cycles_calibration_avg /= 10;
- local_irq_enable();
-
- printk("get_cycles takes [min,avg,max] %llu,%llu,%llu cycles, "
- "results calibrated on avg\n",
- cycles_calibration_min,
- cycles_calibration_avg,
- cycles_calibration_max);
- printk("\n");
-
-#if (NR_WRITERS)
- printk("** Single writer test, no contention **\n");
- wbias_rwlock_profile_latency_reset();
- writer_threads[0] = kthread_run(writer_thread, (void *)0,
- "wbiasrwlock_writer");
- BUG_ON(!writer_threads[0]);
- ssleep(SINGLE_WRITER_TEST_DURATION);
- kthread_stop(writer_threads[0]);
- printk("\n");
-
- wbias_rwlock_profile_latency_print();
-#endif
-
-#if (NR_TRYLOCK_WRITERS)
- printk("** Single trylock writer test, no contention **\n");
- wbias_rwlock_profile_latency_reset();
- trylock_writer_threads[0] = kthread_run(trylock_writer_thread,
- (void *)0,
- "trylock_wbiasrwlock_writer");
- BUG_ON(!trylock_writer_threads[0]);
- ssleep(SINGLE_WRITER_TEST_DURATION);
- kthread_stop(trylock_writer_threads[0]);
- printk("\n");
-
- wbias_rwlock_profile_latency_print();
-#endif
-
-#if (TEST_PREEMPT)
- printk("** Single preemptable reader test, no contention **\n");
- wbias_rwlock_profile_latency_reset();
- preader_threads[0] = kthread_run(preader_thread, (void *)0,
- "wbiasrwlock_preader");
- BUG_ON(!preader_threads[0]);
- ssleep(SINGLE_READER_TEST_DURATION);
- kthread_stop(preader_threads[0]);
- printk("\n");
-
- wbias_rwlock_profile_latency_print();
-#endif
-
- printk("** Single non-preemptable reader test, no contention **\n");
- wbias_rwlock_profile_latency_reset();
- npreader_threads[0] = kthread_run(npreader_thread, (void *)0,
- "wbiasrwlock_npreader");
- BUG_ON(!npreader_threads[0]);
- ssleep(SINGLE_READER_TEST_DURATION);
- kthread_stop(npreader_threads[0]);
- printk("\n");
-
- wbias_rwlock_profile_latency_print();
-
- printk("** Multiple p/non-p readers test, no contention **\n");
- wbias_rwlock_profile_latency_reset();
-#if (TEST_PREEMPT)
- for (i = 0; i < NR_PREADERS; i++) {
- printk("starting preader thread %lu\n", i);
- preader_threads[i] = kthread_run(preader_thread, (void *)i,
- "wbiasrwlock_preader");
- BUG_ON(!preader_threads[i]);
- }
-#endif
- for (i = 0; i < NR_NPREADERS; i++) {
- printk("starting npreader thread %lu\n", i);
- npreader_threads[i] = kthread_run(npreader_thread, (void *)i,
- "wbiasrwlock_npreader");
- BUG_ON(!npreader_threads[i]);
- }
- ssleep(SINGLE_READER_TEST_DURATION);
- for (i = 0; i < NR_NPREADERS; i++)
- kthread_stop(npreader_threads[i]);
-#if (TEST_PREEMPT)
- for (i = 0; i < NR_PREADERS; i++)
- kthread_stop(preader_threads[i]);
-#endif
- printk("\n");
-
- wbias_rwlock_profile_latency_print();
-
- printk("** High contention test **\n");
- wbias_rwlock_profile_latency_reset();
- perform_test("wbias-rwlock-create", wbias_rwlock_create);
- ssleep(TEST_DURATION);
- perform_test("wbias-rwlock-stop", wbias_rwlock_stop);
- printk("\n");
- wbias_rwlock_profile_latency_print();
-
- return -EPERM;
-}
-
-
-static struct file_operations my_operations = {
- .open = my_open,
-};
-
-int init_module(void)
-{
- pentry = create_proc_entry("testwbiasrwlock", 0444, NULL);
- if (pentry)
- pentry->proc_fops = &my_operations;
-
- printk("UC_READER_MASK : %08X\n", UC_READER_MASK);
- printk("UC_HARDIRQ_R_MASK: %08X\n", UC_HARDIRQ_READER_MASK);
- printk("UC_SOFTIRQ_R_MASK: %08X\n", UC_SOFTIRQ_READER_MASK);
- printk("UC_NPTHREA_R_MASK: %08X\n", UC_NPTHREAD_READER_MASK);
- printk("UC_PTHREAD_R_MASK: %08X\n", UC_PTHREAD_READER_MASK);
- printk("UC_WRITER : %08X\n", UC_WRITER);
- printk("UC_SLOW_WRITER : %08X\n", UC_SLOW_WRITER);
- printk("UC_WQ_ACTIVE : %08X\n", UC_WQ_ACTIVE);
- printk("WS_MASK : %08X\n", WS_MASK);
- printk("WS_WQ_MUTEX : %08X\n", WS_WQ_MUTEX);
- printk("WS_COUNT_MUTEX : %08X\n", WS_COUNT_MUTEX);
- printk("WS_LOCK_MUTEX : %08X\n", WS_LOCK_MUTEX);
- printk("CTX_RMASK : %016lX\n", CTX_RMASK);
- printk("CTX_WMASK : %016lX\n", CTX_WMASK);
-
- return 0;
-}
-
-void cleanup_module(void)
-{
- remove_proc_entry("testwbiasrwlock", NULL);
-}
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("wbias rwlock test");
projects / lttv.git / blobdiff