mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Ingo Molnar](/assets/img/avatar_default.png)
We are going to move scheduler ABI details to <uapi/linux/sched/types.h>, which will be used from a number of .c files. Create empty placeholder header that maps to <linux/types.h>. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
660 lines
16 KiB
C
660 lines
16 KiB
C
/*
|
|
* Read-Copy Update module-based performance-test facility
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, you can access it online at
|
|
* http://www.gnu.org/licenses/gpl-2.0.html.
|
|
*
|
|
* Copyright (C) IBM Corporation, 2015
|
|
*
|
|
* Authors: Paul E. McKenney <paulmck@us.ibm.com>
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.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>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.vnet.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)
|
|
|
|
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, false, "Shutdown at end of performance tests.");
|
|
torture_param(bool, verbose, true, "Enable verbose debugging printk()s");
|
|
|
|
static char *perf_type = "rcu";
|
|
module_param(perf_type, charp, 0444);
|
|
MODULE_PARM_DESC(perf_type, "Type of RCU to performance-test (rcu, rcu_bh, ...)");
|
|
|
|
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_perf_writer_started;
|
|
static unsigned long b_rcu_perf_writer_finished;
|
|
|
|
static int rcu_perf_writer_state;
|
|
#define RTWS_INIT 0
|
|
#define RTWS_EXP_SYNC 1
|
|
#define RTWS_SYNC 2
|
|
#define RTWS_IDLE 2
|
|
#define RTWS_STOPPING 3
|
|
|
|
#define MAX_MEAS 10000
|
|
#define MIN_MEAS 100
|
|
|
|
static int perf_runnable = IS_ENABLED(MODULE);
|
|
module_param(perf_runnable, int, 0444);
|
|
MODULE_PARM_DESC(perf_runnable, "Start rcuperf at boot");
|
|
|
|
/*
|
|
* 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 (*started)(void);
|
|
unsigned long (*completed)(void);
|
|
unsigned long (*exp_completed)(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,
|
|
.started = rcu_batches_started,
|
|
.completed = rcu_batches_completed,
|
|
.exp_completed = rcu_exp_batches_completed,
|
|
.sync = synchronize_rcu,
|
|
.exp_sync = synchronize_rcu_expedited,
|
|
.name = "rcu"
|
|
};
|
|
|
|
/*
|
|
* Definitions for rcu_bh perf testing.
|
|
*/
|
|
|
|
static int rcu_bh_perf_read_lock(void) __acquires(RCU_BH)
|
|
{
|
|
rcu_read_lock_bh();
|
|
return 0;
|
|
}
|
|
|
|
static void rcu_bh_perf_read_unlock(int idx) __releases(RCU_BH)
|
|
{
|
|
rcu_read_unlock_bh();
|
|
}
|
|
|
|
static struct rcu_perf_ops rcu_bh_ops = {
|
|
.ptype = RCU_BH_FLAVOR,
|
|
.init = rcu_sync_perf_init,
|
|
.readlock = rcu_bh_perf_read_lock,
|
|
.readunlock = rcu_bh_perf_read_unlock,
|
|
.started = rcu_batches_started_bh,
|
|
.completed = rcu_batches_completed_bh,
|
|
.exp_completed = rcu_exp_batches_completed_sched,
|
|
.sync = synchronize_rcu_bh,
|
|
.exp_sync = synchronize_rcu_bh_expedited,
|
|
.name = "rcu_bh"
|
|
};
|
|
|
|
/*
|
|
* 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_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,
|
|
.started = NULL,
|
|
.completed = srcu_perf_completed,
|
|
.exp_completed = srcu_perf_completed,
|
|
.sync = srcu_perf_synchronize,
|
|
.exp_sync = srcu_perf_synchronize_expedited,
|
|
.name = "srcu"
|
|
};
|
|
|
|
/*
|
|
* Definitions for sched perf testing.
|
|
*/
|
|
|
|
static int sched_perf_read_lock(void)
|
|
{
|
|
preempt_disable();
|
|
return 0;
|
|
}
|
|
|
|
static void sched_perf_read_unlock(int idx)
|
|
{
|
|
preempt_enable();
|
|
}
|
|
|
|
static struct rcu_perf_ops sched_ops = {
|
|
.ptype = RCU_SCHED_FLAVOR,
|
|
.init = rcu_sync_perf_init,
|
|
.readlock = sched_perf_read_lock,
|
|
.readunlock = sched_perf_read_unlock,
|
|
.started = rcu_batches_started_sched,
|
|
.completed = rcu_batches_completed_sched,
|
|
.exp_completed = rcu_exp_batches_completed_sched,
|
|
.sync = synchronize_sched,
|
|
.exp_sync = synchronize_sched_expedited,
|
|
.name = "sched"
|
|
};
|
|
|
|
#ifdef CONFIG_TASKS_RCU
|
|
|
|
/*
|
|
* 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,
|
|
.started = rcu_no_completed,
|
|
.completed = rcu_no_completed,
|
|
.sync = synchronize_rcu_tasks,
|
|
.exp_sync = synchronize_rcu_tasks,
|
|
.name = "tasks"
|
|
};
|
|
|
|
#define RCUPERF_TASKS_OPS &tasks_ops,
|
|
|
|
static bool __maybe_unused torturing_tasks(void)
|
|
{
|
|
return cur_ops == &tasks_ops;
|
|
}
|
|
|
|
#else /* #ifdef CONFIG_TASKS_RCU */
|
|
|
|
#define RCUPERF_TASKS_OPS
|
|
|
|
static bool __maybe_unused torturing_tasks(void)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif /* #else #ifdef CONFIG_TASKS_RCU */
|
|
|
|
/*
|
|
* If performance tests complete, wait for shutdown to commence.
|
|
*/
|
|
static void rcu_perf_wait_shutdown(void)
|
|
{
|
|
cond_resched_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.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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 sched_param sp;
|
|
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));
|
|
sp.sched_priority = 1;
|
|
sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
|
|
|
|
if (holdoff)
|
|
schedule_timeout_uninterruptible(holdoff * HZ);
|
|
|
|
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_perf_writer_started =
|
|
cur_ops->exp_completed() / 2;
|
|
} else {
|
|
b_rcu_perf_writer_started =
|
|
cur_ops->completed();
|
|
}
|
|
}
|
|
|
|
do {
|
|
wdp = &wdpp[i];
|
|
*wdp = ktime_get_mono_fast_ns();
|
|
if (gp_exp) {
|
|
rcu_perf_writer_state = RTWS_EXP_SYNC;
|
|
cur_ops->exp_sync();
|
|
} else {
|
|
rcu_perf_writer_state = RTWS_SYNC;
|
|
cur_ops->sync();
|
|
}
|
|
rcu_perf_writer_state = RTWS_IDLE;
|
|
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;
|
|
sp.sched_priority = 0;
|
|
sched_setscheduler_nocheck(current,
|
|
SCHED_NORMAL, &sp);
|
|
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_perf_writer_finished =
|
|
cur_ops->exp_completed() / 2;
|
|
} else {
|
|
b_rcu_perf_writer_finished =
|
|
cur_ops->completed();
|
|
}
|
|
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());
|
|
rcu_perf_writer_state = RTWS_STOPPING;
|
|
writer_n_durations[me] = i_max;
|
|
torture_kthread_stopping("rcu_perf_writer");
|
|
return 0;
|
|
}
|
|
|
|
static inline 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;
|
|
|
|
if (torture_cleanup_begin())
|
|
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,
|
|
b_rcu_perf_writer_finished -
|
|
b_rcu_perf_writer_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 flavor-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)
|
|
{
|
|
do {
|
|
wait_event(shutdown_wq,
|
|
atomic_read(&n_rcu_perf_writer_finished) >=
|
|
nrealwriters);
|
|
} while (atomic_read(&n_rcu_perf_writer_finished) < nrealwriters);
|
|
smp_mb(); /* Wake before output. */
|
|
rcu_perf_cleanup();
|
|
kernel_power_off();
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int __init
|
|
rcu_perf_init(void)
|
|
{
|
|
long i;
|
|
int firsterr = 0;
|
|
static struct rcu_perf_ops *perf_ops[] = {
|
|
&rcu_ops, &rcu_bh_ops, &srcu_ops, &sched_ops,
|
|
RCUPERF_TASKS_OPS
|
|
};
|
|
|
|
if (!torture_init_begin(perf_type, verbose, &perf_runnable))
|
|
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_alert(" %s", perf_ops[i]->name);
|
|
pr_alert("\n");
|
|
firsterr = -EINVAL;
|
|
goto unwind;
|
|
}
|
|
if (cur_ops->init)
|
|
cur_ops->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;
|
|
}
|
|
if (rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp) {
|
|
VERBOSE_PERFOUT_ERRSTRING("All grace periods expedited, no normal ones to measure!");
|
|
firsterr = -EINVAL;
|
|
goto unwind;
|
|
}
|
|
if (rcu_gp_is_normal() && gp_exp) {
|
|
VERBOSE_PERFOUT_ERRSTRING("All grace periods normal, no expedited ones to measure!");
|
|
firsterr = -EINVAL;
|
|
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);
|