rcuperf: Change rcuperf to rcuscale

This commit further avoids conflation of rcuperf with the kernel's perf
feature by renaming kernel/rcu/rcuperf.c to kernel/rcu/rcuscale.c, and
also by similarly renaming the functions and variables inside this file.
This has the side effect of changing the names of the kernel boot
parameters, so kernel-parameters.txt and ver_functions.sh are also
updated.  The rcutorture --torture type was also updated from rcuperf
to rcuscale.

[ paulmck: Fix bugs located by Stephen Rothwell. ]
Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 0 insertions, 853 deletions

diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
deleted file mode 100644
index 21448d3374e2..000000000000
--- a/kernel/rcu/rcuperf.c
+++ /dev/null
@@ -1,853 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Read-Copy Update module-based performance-test facility
- *
- * Copyright (C) IBM Corporation, 2015
- *
- * Authors: Paul E. McKenney <paulmck@linux.ibm.com>
- */
-
-#define pr_fmt(fmt) fmt
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/kthread.h>
-#include <linux/err.h>
-#include <linux/spinlock.h>
-#include <linux/smp.h>
-#include <linux/rcupdate.h>
-#include <linux/interrupt.h>
-#include <linux/sched.h>
-#include <uapi/linux/sched/types.h>
-#include <linux/atomic.h>
-#include <linux/bitops.h>
-#include <linux/completion.h>
-#include <linux/moduleparam.h>
-#include <linux/percpu.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/freezer.h>
-#include <linux/cpu.h>
-#include <linux/delay.h>
-#include <linux/stat.h>
-#include <linux/srcu.h>
-#include <linux/slab.h>
-#include <asm/byteorder.h>
-#include <linux/torture.h>
-#include <linux/vmalloc.h>
-
-#include "rcu.h"
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>");
-
-#define PERF_FLAG "-perf:"
-#define PERFOUT_STRING(s) \
-	pr_alert("%s" PERF_FLAG " %s\n", perf_type, s)
-#define VERBOSE_PERFOUT_STRING(s) \
-	do { if (verbose) pr_alert("%s" PERF_FLAG " %s\n", perf_type, s); } while (0)
-#define VERBOSE_PERFOUT_ERRSTRING(s) \
-	do { if (verbose) pr_alert("%s" PERF_FLAG "!!! %s\n", perf_type, s); } while (0)
-
-/*
- * The intended use cases for the nreaders and nwriters module parameters
- * are as follows:
- *
- * 1.	Specify only the nr_cpus kernel boot parameter.  This will
- *	set both nreaders and nwriters to the value specified by
- *	nr_cpus for a mixed reader/writer test.
- *
- * 2.	Specify the nr_cpus kernel boot parameter, but set
- *	rcuperf.nreaders to zero.  This will set nwriters to the
- *	value specified by nr_cpus for an update-only test.
- *
- * 3.	Specify the nr_cpus kernel boot parameter, but set
- *	rcuperf.nwriters to zero.  This will set nreaders to the
- *	value specified by nr_cpus for a read-only test.
- *
- * Various other use cases may of course be specified.
- *
- * Note that this test's readers are intended only as a test load for
- * the writers.  The reader performance statistics will be overly
- * pessimistic due to the per-critical-section interrupt disabling,
- * test-end checks, and the pair of calls through pointers.
- */
-
-#ifdef MODULE
-# define RCUPERF_SHUTDOWN 0
-#else
-# define RCUPERF_SHUTDOWN 1
-#endif
-
-torture_param(bool, gp_async, false, "Use asynchronous GP wait primitives");
-torture_param(int, gp_async_max, 1000, "Max # outstanding waits per reader");
-torture_param(bool, gp_exp, false, "Use expedited GP wait primitives");
-torture_param(int, holdoff, 10, "Holdoff time before test start (s)");
-torture_param(int, nreaders, -1, "Number of RCU reader threads");
-torture_param(int, nwriters, -1, "Number of RCU updater threads");
-torture_param(bool, shutdown, RCUPERF_SHUTDOWN,
-	      "Shutdown at end of performance tests.");
-torture_param(int, verbose, 1, "Enable verbose debugging printk()s");
-torture_param(int, writer_holdoff, 0, "Holdoff (us) between GPs, zero to disable");
-torture_param(int, kfree_rcu_test, 0, "Do we run a kfree_rcu() perf test?");
-torture_param(int, kfree_mult, 1, "Multiple of kfree_obj size to allocate.");
-
-static char *perf_type = "rcu";
-module_param(perf_type, charp, 0444);
-MODULE_PARM_DESC(perf_type, "Type of RCU to performance-test (rcu, srcu, ...)");
-
-static int nrealreaders;
-static int nrealwriters;
-static struct task_struct **writer_tasks;
-static struct task_struct **reader_tasks;
-static struct task_struct *shutdown_task;
-
-static u64 **writer_durations;
-static int *writer_n_durations;
-static atomic_t n_rcu_perf_reader_started;
-static atomic_t n_rcu_perf_writer_started;
-static atomic_t n_rcu_perf_writer_finished;
-static wait_queue_head_t shutdown_wq;
-static u64 t_rcu_perf_writer_started;
-static u64 t_rcu_perf_writer_finished;
-static unsigned long b_rcu_gp_test_started;
-static unsigned long b_rcu_gp_test_finished;
-static DEFINE_PER_CPU(atomic_t, n_async_inflight);
-
-#define MAX_MEAS 10000
-#define MIN_MEAS 100
-
-/*
- * Operations vector for selecting different types of tests.
- */
-
-struct rcu_perf_ops {
-	int ptype;
-	void (*init)(void);
-	void (*cleanup)(void);
-	int (*readlock)(void);
-	void (*readunlock)(int idx);
-	unsigned long (*get_gp_seq)(void);
-	unsigned long (*gp_diff)(unsigned long new, unsigned long old);
-	unsigned long (*exp_completed)(void);
-	void (*async)(struct rcu_head *head, rcu_callback_t func);
-	void (*gp_barrier)(void);
-	void (*sync)(void);
-	void (*exp_sync)(void);
-	const char *name;
-};
-
-static struct rcu_perf_ops *cur_ops;
-
-/*
- * Definitions for rcu perf testing.
- */
-
-static int rcu_perf_read_lock(void) __acquires(RCU)
-{
-	rcu_read_lock();
-	return 0;
-}
-
-static void rcu_perf_read_unlock(int idx) __releases(RCU)
-{
-	rcu_read_unlock();
-}
-
-static unsigned long __maybe_unused rcu_no_completed(void)
-{
-	return 0;
-}
-
-static void rcu_sync_perf_init(void)
-{
-}
-
-static struct rcu_perf_ops rcu_ops = {
-	.ptype		= RCU_FLAVOR,
-	.init		= rcu_sync_perf_init,
-	.readlock	= rcu_perf_read_lock,
-	.readunlock	= rcu_perf_read_unlock,
-	.get_gp_seq	= rcu_get_gp_seq,
-	.gp_diff	= rcu_seq_diff,
-	.exp_completed	= rcu_exp_batches_completed,
-	.async		= call_rcu,
-	.gp_barrier	= rcu_barrier,
-	.sync		= synchronize_rcu,
-	.exp_sync	= synchronize_rcu_expedited,
-	.name		= "rcu"
-};
-
-/*
- * Definitions for srcu perf testing.
- */
-
-DEFINE_STATIC_SRCU(srcu_ctl_perf);
-static struct srcu_struct *srcu_ctlp = &srcu_ctl_perf;
-
-static int srcu_perf_read_lock(void) __acquires(srcu_ctlp)
-{
-	return srcu_read_lock(srcu_ctlp);
-}
-
-static void srcu_perf_read_unlock(int idx) __releases(srcu_ctlp)
-{
-	srcu_read_unlock(srcu_ctlp, idx);
-}
-
-static unsigned long srcu_perf_completed(void)
-{
-	return srcu_batches_completed(srcu_ctlp);
-}
-
-static void srcu_call_rcu(struct rcu_head *head, rcu_callback_t func)
-{
-	call_srcu(srcu_ctlp, head, func);
-}
-
-static void srcu_rcu_barrier(void)
-{
-	srcu_barrier(srcu_ctlp);
-}
-
-static void srcu_perf_synchronize(void)
-{
-	synchronize_srcu(srcu_ctlp);
-}
-
-static void srcu_perf_synchronize_expedited(void)
-{
-	synchronize_srcu_expedited(srcu_ctlp);
-}
-
-static struct rcu_perf_ops srcu_ops = {
-	.ptype		= SRCU_FLAVOR,
-	.init		= rcu_sync_perf_init,
-	.readlock	= srcu_perf_read_lock,
-	.readunlock	= srcu_perf_read_unlock,
-	.get_gp_seq	= srcu_perf_completed,
-	.gp_diff	= rcu_seq_diff,
-	.exp_completed	= srcu_perf_completed,
-	.async		= srcu_call_rcu,
-	.gp_barrier	= srcu_rcu_barrier,
-	.sync		= srcu_perf_synchronize,
-	.exp_sync	= srcu_perf_synchronize_expedited,
-	.name		= "srcu"
-};
-
-static struct srcu_struct srcud;
-
-static void srcu_sync_perf_init(void)
-{
-	srcu_ctlp = &srcud;
-	init_srcu_struct(srcu_ctlp);
-}
-
-static void srcu_sync_perf_cleanup(void)
-{
-	cleanup_srcu_struct(srcu_ctlp);
-}
-
-static struct rcu_perf_ops srcud_ops = {
-	.ptype		= SRCU_FLAVOR,
-	.init		= srcu_sync_perf_init,
-	.cleanup	= srcu_sync_perf_cleanup,
-	.readlock	= srcu_perf_read_lock,
-	.readunlock	= srcu_perf_read_unlock,
-	.get_gp_seq	= srcu_perf_completed,
-	.gp_diff	= rcu_seq_diff,
-	.exp_completed	= srcu_perf_completed,
-	.async		= srcu_call_rcu,
-	.gp_barrier	= srcu_rcu_barrier,
-	.sync		= srcu_perf_synchronize,
-	.exp_sync	= srcu_perf_synchronize_expedited,
-	.name		= "srcud"
-};
-
-/*
- * Definitions for RCU-tasks perf testing.
- */
-
-static int tasks_perf_read_lock(void)
-{
-	return 0;
-}
-
-static void tasks_perf_read_unlock(int idx)
-{
-}
-
-static struct rcu_perf_ops tasks_ops = {
-	.ptype		= RCU_TASKS_FLAVOR,
-	.init		= rcu_sync_perf_init,
-	.readlock	= tasks_perf_read_lock,
-	.readunlock	= tasks_perf_read_unlock,
-	.get_gp_seq	= rcu_no_completed,
-	.gp_diff	= rcu_seq_diff,
-	.async		= call_rcu_tasks,
-	.gp_barrier	= rcu_barrier_tasks,
-	.sync		= synchronize_rcu_tasks,
-	.exp_sync	= synchronize_rcu_tasks,
-	.name		= "tasks"
-};
-
-static unsigned long rcuperf_seq_diff(unsigned long new, unsigned long old)
-{
-	if (!cur_ops->gp_diff)
-		return new - old;
-	return cur_ops->gp_diff(new, old);
-}
-
-/*
- * If performance tests complete, wait for shutdown to commence.
- */
-static void rcu_perf_wait_shutdown(void)
-{
-	cond_resched_tasks_rcu_qs();
-	if (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters)
-		return;
-	while (!torture_must_stop())
-		schedule_timeout_uninterruptible(1);
-}
-
-/*
- * RCU perf reader kthread.  Repeatedly does empty RCU read-side critical
- * section, minimizing update-side interference.  However, the point of
- * this test is not to evaluate reader performance, but instead to serve
- * as a test load for update-side performance testing.
- */
-static int
-rcu_perf_reader(void *arg)
-{
-	unsigned long flags;
-	int idx;
-	long me = (long)arg;
-
-	VERBOSE_PERFOUT_STRING("rcu_perf_reader task started");
-	set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
-	set_user_nice(current, MAX_NICE);
-	atomic_inc(&n_rcu_perf_reader_started);
-
-	do {
-		local_irq_save(flags);
-		idx = cur_ops->readlock();
-		cur_ops->readunlock(idx);
-		local_irq_restore(flags);
-		rcu_perf_wait_shutdown();
-	} while (!torture_must_stop());
-	torture_kthread_stopping("rcu_perf_reader");
-	return 0;
-}
-
-/*
- * Callback function for asynchronous grace periods from rcu_perf_writer().
- */
-static void rcu_perf_async_cb(struct rcu_head *rhp)
-{
-	atomic_dec(this_cpu_ptr(&n_async_inflight));
-	kfree(rhp);
-}
-
-/*
- * RCU perf writer kthread.  Repeatedly does a grace period.
- */
-static int
-rcu_perf_writer(void *arg)
-{
-	int i = 0;
-	int i_max;
-	long me = (long)arg;
-	struct rcu_head *rhp = NULL;
-	bool started = false, done = false, alldone = false;
-	u64 t;
-	u64 *wdp;
-	u64 *wdpp = writer_durations[me];
-
-	VERBOSE_PERFOUT_STRING("rcu_perf_writer task started");
-	WARN_ON(!wdpp);
-	set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
-	sched_set_fifo_low(current);
-
-	if (holdoff)
-		schedule_timeout_uninterruptible(holdoff * HZ);
-
-	/*
-	 * Wait until rcu_end_inkernel_boot() is called for normal GP tests
-	 * so that RCU is not always expedited for normal GP tests.
-	 * The system_state test is approximate, but works well in practice.
-	 */
-	while (!gp_exp && system_state != SYSTEM_RUNNING)
-		schedule_timeout_uninterruptible(1);
-
-	t = ktime_get_mono_fast_ns();
-	if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) {
-		t_rcu_perf_writer_started = t;
-		if (gp_exp) {
-			b_rcu_gp_test_started =
-				cur_ops->exp_completed() / 2;
-		} else {
-			b_rcu_gp_test_started = cur_ops->get_gp_seq();
-		}
-	}
-
-	do {
-		if (writer_holdoff)
-			udelay(writer_holdoff);
-		wdp = &wdpp[i];
-		*wdp = ktime_get_mono_fast_ns();
-		if (gp_async) {
-retry:
-			if (!rhp)
-				rhp = kmalloc(sizeof(*rhp), GFP_KERNEL);
-			if (rhp && atomic_read(this_cpu_ptr(&n_async_inflight)) < gp_async_max) {
-				atomic_inc(this_cpu_ptr(&n_async_inflight));
-				cur_ops->async(rhp, rcu_perf_async_cb);
-				rhp = NULL;
-			} else if (!kthread_should_stop()) {
-				cur_ops->gp_barrier();
-				goto retry;
-			} else {
-				kfree(rhp); /* Because we are stopping. */
-			}
-		} else if (gp_exp) {
-			cur_ops->exp_sync();
-		} else {
-			cur_ops->sync();
-		}
-		t = ktime_get_mono_fast_ns();
-		*wdp = t - *wdp;
-		i_max = i;
-		if (!started &&
-		    atomic_read(&n_rcu_perf_writer_started) >= nrealwriters)
-			started = true;
-		if (!done && i >= MIN_MEAS) {
-			done = true;
-			sched_set_normal(current, 0);
-			pr_alert("%s%s rcu_perf_writer %ld has %d measurements\n",
-				 perf_type, PERF_FLAG, me, MIN_MEAS);
-			if (atomic_inc_return(&n_rcu_perf_writer_finished) >=
-			    nrealwriters) {
-				schedule_timeout_interruptible(10);
-				rcu_ftrace_dump(DUMP_ALL);
-				PERFOUT_STRING("Test complete");
-				t_rcu_perf_writer_finished = t;
-				if (gp_exp) {
-					b_rcu_gp_test_finished =
-						cur_ops->exp_completed() / 2;
-				} else {
-					b_rcu_gp_test_finished =
-						cur_ops->get_gp_seq();
-				}
-				if (shutdown) {
-					smp_mb(); /* Assign before wake. */
-					wake_up(&shutdown_wq);
-				}
-			}
-		}
-		if (done && !alldone &&
-		    atomic_read(&n_rcu_perf_writer_finished) >= nrealwriters)
-			alldone = true;
-		if (started && !alldone && i < MAX_MEAS - 1)
-			i++;
-		rcu_perf_wait_shutdown();
-	} while (!torture_must_stop());
-	if (gp_async) {
-		cur_ops->gp_barrier();
-	}
-	writer_n_durations[me] = i_max;
-	torture_kthread_stopping("rcu_perf_writer");
-	return 0;
-}
-
-static void
-rcu_perf_print_module_parms(struct rcu_perf_ops *cur_ops, const char *tag)
-{
-	pr_alert("%s" PERF_FLAG
-		 "--- %s: nreaders=%d nwriters=%d verbose=%d shutdown=%d\n",
-		 perf_type, tag, nrealreaders, nrealwriters, verbose, shutdown);
-}
-
-static void
-rcu_perf_cleanup(void)
-{
-	int i;
-	int j;
-	int ngps = 0;
-	u64 *wdp;
-	u64 *wdpp;
-
-	/*
-	 * Would like warning at start, but everything is expedited
-	 * during the mid-boot phase, so have to wait till the end.
-	 */
-	if (rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp)
-		VERBOSE_PERFOUT_ERRSTRING("All grace periods expedited, no normal ones to measure!");
-	if (rcu_gp_is_normal() && gp_exp)
-		VERBOSE_PERFOUT_ERRSTRING("All grace periods normal, no expedited ones to measure!");
-	if (gp_exp && gp_async)
-		VERBOSE_PERFOUT_ERRSTRING("No expedited async GPs, so went with async!");
-
-	if (torture_cleanup_begin())
-		return;
-	if (!cur_ops) {
-		torture_cleanup_end();
-		return;
-	}
-
-	if (reader_tasks) {
-		for (i = 0; i < nrealreaders; i++)
-			torture_stop_kthread(rcu_perf_reader,
-					     reader_tasks[i]);
-		kfree(reader_tasks);
-	}
-
-	if (writer_tasks) {
-		for (i = 0; i < nrealwriters; i++) {
-			torture_stop_kthread(rcu_perf_writer,
-					     writer_tasks[i]);
-			if (!writer_n_durations)
-				continue;
-			j = writer_n_durations[i];
-			pr_alert("%s%s writer %d gps: %d\n",
-				 perf_type, PERF_FLAG, i, j);
-			ngps += j;
-		}
-		pr_alert("%s%s start: %llu end: %llu duration: %llu gps: %d batches: %ld\n",
-			 perf_type, PERF_FLAG,
-			 t_rcu_perf_writer_started, t_rcu_perf_writer_finished,
-			 t_rcu_perf_writer_finished -
-			 t_rcu_perf_writer_started,
-			 ngps,
-			 rcuperf_seq_diff(b_rcu_gp_test_finished,
-					  b_rcu_gp_test_started));
-		for (i = 0; i < nrealwriters; i++) {
-			if (!writer_durations)
-				break;
-			if (!writer_n_durations)
-				continue;
-			wdpp = writer_durations[i];
-			if (!wdpp)
-				continue;
-			for (j = 0; j <= writer_n_durations[i]; j++) {
-				wdp = &wdpp[j];
-				pr_alert("%s%s %4d writer-duration: %5d %llu\n",
-					perf_type, PERF_FLAG,
-					i, j, *wdp);
-				if (j % 100 == 0)
-					schedule_timeout_uninterruptible(1);
-			}
-			kfree(writer_durations[i]);
-		}
-		kfree(writer_tasks);
-		kfree(writer_durations);
-		kfree(writer_n_durations);
-	}
-
-	/* Do torture-type-specific cleanup operations.  */
-	if (cur_ops->cleanup != NULL)
-		cur_ops->cleanup();
-
-	torture_cleanup_end();
-}
-
-/*
- * Return the number if non-negative.  If -1, the number of CPUs.
- * If less than -1, that much less than the number of CPUs, but
- * at least one.
- */
-static int compute_real(int n)
-{
-	int nr;
-
-	if (n >= 0) {
-		nr = n;
-	} else {
-		nr = num_online_cpus() + 1 + n;
-		if (nr <= 0)
-			nr = 1;
-	}
-	return nr;
-}
-
-/*
- * RCU perf shutdown kthread.  Just waits to be awakened, then shuts
- * down system.
- */
-static int
-rcu_perf_shutdown(void *arg)
-{
-	wait_event(shutdown_wq,
-		   atomic_read(&n_rcu_perf_writer_finished) >= nrealwriters);
-	smp_mb(); /* Wake before output. */
-	rcu_perf_cleanup();
-	kernel_power_off();
-	return -EINVAL;
-}
-
-/*
- * kfree_rcu() performance tests: Start a kfree_rcu() loop on all CPUs for number
- * of iterations and measure total time and number of GP for all iterations to complete.
- */
-
-torture_param(int, kfree_nthreads, -1, "Number of threads running loops of kfree_rcu().");
-torture_param(int, kfree_alloc_num, 8000, "Number of allocations and frees done in an iteration.");
-torture_param(int, kfree_loops, 10, "Number of loops doing kfree_alloc_num allocations and frees.");
-
-static struct task_struct **kfree_reader_tasks;
-static int kfree_nrealthreads;
-static atomic_t n_kfree_perf_thread_started;
-static atomic_t n_kfree_perf_thread_ended;
-
-struct kfree_obj {
-	char kfree_obj[8];
-	struct rcu_head rh;
-};
-
-static int
-kfree_perf_thread(void *arg)
-{
-	int i, loop = 0;
-	long me = (long)arg;
-	struct kfree_obj *alloc_ptr;
-	u64 start_time, end_time;
-	long long mem_begin, mem_during = 0;
-
-	VERBOSE_PERFOUT_STRING("kfree_perf_thread task started");
-	set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
-	set_user_nice(current, MAX_NICE);
-
-	start_time = ktime_get_mono_fast_ns();
-
-	if (atomic_inc_return(&n_kfree_perf_thread_started) >= kfree_nrealthreads) {
-		if (gp_exp)
-			b_rcu_gp_test_started = cur_ops->exp_completed() / 2;
-		else
-			b_rcu_gp_test_started = cur_ops->get_gp_seq();
-	}
-
-	do {
-		if (!mem_during) {
-			mem_during = mem_begin = si_mem_available();
-		} else if (loop % (kfree_loops / 4) == 0) {
-			mem_during = (mem_during + si_mem_available()) / 2;
-		}
-
-		for (i = 0; i < kfree_alloc_num; i++) {
-			alloc_ptr = kmalloc(kfree_mult * sizeof(struct kfree_obj), GFP_KERNEL);
-			if (!alloc_ptr)
-				return -ENOMEM;
-
-			kfree_rcu(alloc_ptr, rh);
-		}
-
-		cond_resched();
-	} while (!torture_must_stop() && ++loop < kfree_loops);
-
-	if (atomic_inc_return(&n_kfree_perf_thread_ended) >= kfree_nrealthreads) {
-		end_time = ktime_get_mono_fast_ns();
-
-		if (gp_exp)
-			b_rcu_gp_test_finished = cur_ops->exp_completed() / 2;
-		else
-			b_rcu_gp_test_finished = cur_ops->get_gp_seq();
-
-		pr_alert("Total time taken by all kfree'ers: %llu ns, loops: %d, batches: %ld, memory footprint: %lldMB\n",
-		       (unsigned long long)(end_time - start_time), kfree_loops,
-		       rcuperf_seq_diff(b_rcu_gp_test_finished, b_rcu_gp_test_started),
-		       (mem_begin - mem_during) >> (20 - PAGE_SHIFT));
-
-		if (shutdown) {
-			smp_mb(); /* Assign before wake. */
-			wake_up(&shutdown_wq);
-		}
-	}
-
-	torture_kthread_stopping("kfree_perf_thread");
-	return 0;
-}
-
-static void
-kfree_perf_cleanup(void)
-{
-	int i;
-
-	if (torture_cleanup_begin())
-		return;
-
-	if (kfree_reader_tasks) {
-		for (i = 0; i < kfree_nrealthreads; i++)
-			torture_stop_kthread(kfree_perf_thread,
-					     kfree_reader_tasks[i]);
-		kfree(kfree_reader_tasks);
-	}
-
-	torture_cleanup_end();
-}
-
-/*
- * shutdown kthread.  Just waits to be awakened, then shuts down system.
- */
-static int
-kfree_perf_shutdown(void *arg)
-{
-	wait_event(shutdown_wq,
-		   atomic_read(&n_kfree_perf_thread_ended) >= kfree_nrealthreads);
-
-	smp_mb(); /* Wake before output. */
-
-	kfree_perf_cleanup();
-	kernel_power_off();
-	return -EINVAL;
-}
-
-static int __init
-kfree_perf_init(void)
-{
-	long i;
-	int firsterr = 0;
-
-	kfree_nrealthreads = compute_real(kfree_nthreads);
-	/* Start up the kthreads. */
-	if (shutdown) {
-		init_waitqueue_head(&shutdown_wq);
-		firsterr = torture_create_kthread(kfree_perf_shutdown, NULL,
-						  shutdown_task);
-		if (firsterr)
-			goto unwind;
-		schedule_timeout_uninterruptible(1);
-	}
-
-	pr_alert("kfree object size=%zu\n", kfree_mult * sizeof(struct kfree_obj));
-
-	kfree_reader_tasks = kcalloc(kfree_nrealthreads, sizeof(kfree_reader_tasks[0]),
-			       GFP_KERNEL);
-	if (kfree_reader_tasks == NULL) {
-		firsterr = -ENOMEM;
-		goto unwind;
-	}
-
-	for (i = 0; i < kfree_nrealthreads; i++) {
-		firsterr = torture_create_kthread(kfree_perf_thread, (void *)i,
-						  kfree_reader_tasks[i]);
-		if (firsterr)
-			goto unwind;
-	}
-
-	while (atomic_read(&n_kfree_perf_thread_started) < kfree_nrealthreads)
-		schedule_timeout_uninterruptible(1);
-
-	torture_init_end();
-	return 0;
-
-unwind:
-	torture_init_end();
-	kfree_perf_cleanup();
-	return firsterr;
-}
-
-static int __init
-rcu_perf_init(void)
-{
-	long i;
-	int firsterr = 0;
-	static struct rcu_perf_ops *perf_ops[] = {
-		&rcu_ops, &srcu_ops, &srcud_ops, &tasks_ops,
-	};
-
-	if (!torture_init_begin(perf_type, verbose))
-		return -EBUSY;
-
-	/* Process args and tell the world that the perf'er is on the job. */
-	for (i = 0; i < ARRAY_SIZE(perf_ops); i++) {
-		cur_ops = perf_ops[i];
-		if (strcmp(perf_type, cur_ops->name) == 0)
-			break;
-	}
-	if (i == ARRAY_SIZE(perf_ops)) {
-		pr_alert("rcu-perf: invalid perf type: \"%s\"\n", perf_type);
-		pr_alert("rcu-perf types:");
-		for (i = 0; i < ARRAY_SIZE(perf_ops); i++)
-			pr_cont(" %s", perf_ops[i]->name);
-		pr_cont("\n");
-		WARN_ON(!IS_MODULE(CONFIG_RCU_PERF_TEST));
-		firsterr = -EINVAL;
-		cur_ops = NULL;
-		goto unwind;
-	}
-	if (cur_ops->init)
-		cur_ops->init();
-
-	if (kfree_rcu_test)
-		return kfree_perf_init();
-
-	nrealwriters = compute_real(nwriters);
-	nrealreaders = compute_real(nreaders);
-	atomic_set(&n_rcu_perf_reader_started, 0);
-	atomic_set(&n_rcu_perf_writer_started, 0);
-	atomic_set(&n_rcu_perf_writer_finished, 0);
-	rcu_perf_print_module_parms(cur_ops, "Start of test");
-
-	/* Start up the kthreads. */
-
-	if (shutdown) {
-		init_waitqueue_head(&shutdown_wq);
-		firsterr = torture_create_kthread(rcu_perf_shutdown, NULL,
-						  shutdown_task);
-		if (firsterr)
-			goto unwind;
-		schedule_timeout_uninterruptible(1);
-	}
-	reader_tasks = kcalloc(nrealreaders, sizeof(reader_tasks[0]),
-			       GFP_KERNEL);
-	if (reader_tasks == NULL) {
-		VERBOSE_PERFOUT_ERRSTRING("out of memory");
-		firsterr = -ENOMEM;
-		goto unwind;
-	}
-	for (i = 0; i < nrealreaders; i++) {
-		firsterr = torture_create_kthread(rcu_perf_reader, (void *)i,
-						  reader_tasks[i]);
-		if (firsterr)
-			goto unwind;
-	}
-	while (atomic_read(&n_rcu_perf_reader_started) < nrealreaders)
-		schedule_timeout_uninterruptible(1);
-	writer_tasks = kcalloc(nrealwriters, sizeof(reader_tasks[0]),
-			       GFP_KERNEL);
-	writer_durations = kcalloc(nrealwriters, sizeof(*writer_durations),
-				   GFP_KERNEL);
-	writer_n_durations =
-		kcalloc(nrealwriters, sizeof(*writer_n_durations),
-			GFP_KERNEL);
-	if (!writer_tasks || !writer_durations || !writer_n_durations) {
-		VERBOSE_PERFOUT_ERRSTRING("out of memory");
-		firsterr = -ENOMEM;
-		goto unwind;
-	}
-	for (i = 0; i < nrealwriters; i++) {
-		writer_durations[i] =
-			kcalloc(MAX_MEAS, sizeof(*writer_durations[i]),
-				GFP_KERNEL);
-		if (!writer_durations[i]) {
-			firsterr = -ENOMEM;
-			goto unwind;
-		}
-		firsterr = torture_create_kthread(rcu_perf_writer, (void *)i,
-						  writer_tasks[i]);
-		if (firsterr)
-			goto unwind;
-	}
-	torture_init_end();
-	return 0;
-
-unwind:
-	torture_init_end();
-	rcu_perf_cleanup();
-	return firsterr;
-}
-
-module_init(rcu_perf_init);
-module_exit(rcu_perf_cleanup);