mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
22b6d14992
If the call to set_cpus_allowed_ptr() in scftorture_invoker()
fails, a later WARN_ONCE() complains. But with the advent of
570a752b7a
("lib/smp_processor_id: Use is_percpu_thread() instead of
nr_cpus_allowed"), this complaint can be drowned out by complaints from
smp_processor_id(). The rationale for this change is that scftorture's
kthreads are not marked with PF_NO_SETAFFINITY, which means that a system
administrator could change affinity at any time.
However, scftorture is a torture test, and the system administrator might
well have a valid test-the-test reason for changing affinity. This commit
therefore changes to raw_smp_processor_id() in order to avoid the noise,
and also adds a WARN_ON_ONCE() to the call to set_cpus_allowed_ptr() in
order to directly detect immediate failure. There is no WARN_ON_ONCE()
within the test loop, allowing human-reflex-based affinity resetting,
if desired.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
609 lines
18 KiB
C
609 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
//
|
|
// Torture test for smp_call_function() and friends.
|
|
//
|
|
// Copyright (C) Facebook, 2020.
|
|
//
|
|
// Author: Paul E. McKenney <paulmck@kernel.org>
|
|
|
|
#define pr_fmt(fmt) fmt
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/rcupdate_trace.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/srcu.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/torture.h>
|
|
#include <linux/types.h>
|
|
|
|
#define SCFTORT_STRING "scftorture"
|
|
#define SCFTORT_FLAG SCFTORT_STRING ": "
|
|
|
|
#define SCFTORTOUT(s, x...) \
|
|
pr_alert(SCFTORT_FLAG s, ## x)
|
|
|
|
#define VERBOSE_SCFTORTOUT(s, x...) \
|
|
do { if (verbose) pr_alert(SCFTORT_FLAG s, ## x); } while (0)
|
|
|
|
#define VERBOSE_SCFTORTOUT_ERRSTRING(s, x...) \
|
|
do { if (verbose) pr_alert(SCFTORT_FLAG "!!! " s, ## x); } while (0)
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Paul E. McKenney <paulmck@kernel.org>");
|
|
|
|
// Wait until there are multiple CPUs before starting test.
|
|
torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0,
|
|
"Holdoff time before test start (s)");
|
|
torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)");
|
|
torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs.");
|
|
torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)");
|
|
torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable");
|
|
torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable.");
|
|
torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s.");
|
|
torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable");
|
|
torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug.");
|
|
torture_param(int, verbose, 0, "Enable verbose debugging printk()s");
|
|
torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations.");
|
|
torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations.");
|
|
torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations.");
|
|
torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations.");
|
|
torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations.");
|
|
torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations.");
|
|
torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations.");
|
|
|
|
char *torture_type = "";
|
|
|
|
#ifdef MODULE
|
|
# define SCFTORT_SHUTDOWN 0
|
|
#else
|
|
# define SCFTORT_SHUTDOWN 1
|
|
#endif
|
|
|
|
torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test.");
|
|
|
|
struct scf_statistics {
|
|
struct task_struct *task;
|
|
int cpu;
|
|
long long n_resched;
|
|
long long n_single;
|
|
long long n_single_ofl;
|
|
long long n_single_wait;
|
|
long long n_single_wait_ofl;
|
|
long long n_many;
|
|
long long n_many_wait;
|
|
long long n_all;
|
|
long long n_all_wait;
|
|
};
|
|
|
|
static struct scf_statistics *scf_stats_p;
|
|
static struct task_struct *scf_torture_stats_task;
|
|
static DEFINE_PER_CPU(long long, scf_invoked_count);
|
|
|
|
// Data for random primitive selection
|
|
#define SCF_PRIM_RESCHED 0
|
|
#define SCF_PRIM_SINGLE 1
|
|
#define SCF_PRIM_MANY 2
|
|
#define SCF_PRIM_ALL 3
|
|
#define SCF_NPRIMS 7 // Need wait and no-wait versions of each,
|
|
// except for SCF_PRIM_RESCHED.
|
|
|
|
static char *scf_prim_name[] = {
|
|
"resched_cpu",
|
|
"smp_call_function_single",
|
|
"smp_call_function_many",
|
|
"smp_call_function",
|
|
};
|
|
|
|
struct scf_selector {
|
|
unsigned long scfs_weight;
|
|
int scfs_prim;
|
|
bool scfs_wait;
|
|
};
|
|
static struct scf_selector scf_sel_array[SCF_NPRIMS];
|
|
static int scf_sel_array_len;
|
|
static unsigned long scf_sel_totweight;
|
|
|
|
// Communicate between caller and handler.
|
|
struct scf_check {
|
|
bool scfc_in;
|
|
bool scfc_out;
|
|
int scfc_cpu; // -1 for not _single().
|
|
bool scfc_wait;
|
|
};
|
|
|
|
// Use to wait for all threads to start.
|
|
static atomic_t n_started;
|
|
static atomic_t n_errs;
|
|
static atomic_t n_mb_in_errs;
|
|
static atomic_t n_mb_out_errs;
|
|
static atomic_t n_alloc_errs;
|
|
static bool scfdone;
|
|
static char *bangstr = "";
|
|
|
|
static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand);
|
|
|
|
extern void resched_cpu(int cpu); // An alternative IPI vector.
|
|
|
|
// Print torture statistics. Caller must ensure serialization.
|
|
static void scf_torture_stats_print(void)
|
|
{
|
|
int cpu;
|
|
int i;
|
|
long long invoked_count = 0;
|
|
bool isdone = READ_ONCE(scfdone);
|
|
struct scf_statistics scfs = {};
|
|
|
|
for_each_possible_cpu(cpu)
|
|
invoked_count += data_race(per_cpu(scf_invoked_count, cpu));
|
|
for (i = 0; i < nthreads; i++) {
|
|
scfs.n_resched += scf_stats_p[i].n_resched;
|
|
scfs.n_single += scf_stats_p[i].n_single;
|
|
scfs.n_single_ofl += scf_stats_p[i].n_single_ofl;
|
|
scfs.n_single_wait += scf_stats_p[i].n_single_wait;
|
|
scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl;
|
|
scfs.n_many += scf_stats_p[i].n_many;
|
|
scfs.n_many_wait += scf_stats_p[i].n_many_wait;
|
|
scfs.n_all += scf_stats_p[i].n_all;
|
|
scfs.n_all_wait += scf_stats_p[i].n_all_wait;
|
|
}
|
|
if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) ||
|
|
atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs))
|
|
bangstr = "!!! ";
|
|
pr_alert("%s %sscf_invoked_count %s: %lld resched: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ",
|
|
SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched,
|
|
scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl,
|
|
scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait);
|
|
torture_onoff_stats();
|
|
pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs),
|
|
atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs),
|
|
atomic_read(&n_alloc_errs));
|
|
}
|
|
|
|
// Periodically prints torture statistics, if periodic statistics printing
|
|
// was specified via the stat_interval module parameter.
|
|
static int
|
|
scf_torture_stats(void *arg)
|
|
{
|
|
VERBOSE_TOROUT_STRING("scf_torture_stats task started");
|
|
do {
|
|
schedule_timeout_interruptible(stat_interval * HZ);
|
|
scf_torture_stats_print();
|
|
torture_shutdown_absorb("scf_torture_stats");
|
|
} while (!torture_must_stop());
|
|
torture_kthread_stopping("scf_torture_stats");
|
|
return 0;
|
|
}
|
|
|
|
// Add a primitive to the scf_sel_array[].
|
|
static void scf_sel_add(unsigned long weight, int prim, bool wait)
|
|
{
|
|
struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len];
|
|
|
|
// If no weight, if array would overflow, if computing three-place
|
|
// percentages would overflow, or if the scf_prim_name[] array would
|
|
// overflow, don't bother. In the last three two cases, complain.
|
|
if (!weight ||
|
|
WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) ||
|
|
WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) ||
|
|
WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name)))
|
|
return;
|
|
scf_sel_totweight += weight;
|
|
scfsp->scfs_weight = scf_sel_totweight;
|
|
scfsp->scfs_prim = prim;
|
|
scfsp->scfs_wait = wait;
|
|
scf_sel_array_len++;
|
|
}
|
|
|
|
// Dump out weighting percentages for scf_prim_name[] array.
|
|
static void scf_sel_dump(void)
|
|
{
|
|
int i;
|
|
unsigned long oldw = 0;
|
|
struct scf_selector *scfsp;
|
|
unsigned long w;
|
|
|
|
for (i = 0; i < scf_sel_array_len; i++) {
|
|
scfsp = &scf_sel_array[i];
|
|
w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight;
|
|
pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000,
|
|
scf_prim_name[scfsp->scfs_prim],
|
|
scfsp->scfs_wait ? "wait" : "nowait");
|
|
oldw = scfsp->scfs_weight;
|
|
}
|
|
}
|
|
|
|
// Randomly pick a primitive and wait/nowait, based on weightings.
|
|
static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp)
|
|
{
|
|
int i;
|
|
unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1);
|
|
|
|
for (i = 0; i < scf_sel_array_len; i++)
|
|
if (scf_sel_array[i].scfs_weight >= w)
|
|
return &scf_sel_array[i];
|
|
WARN_ON_ONCE(1);
|
|
return &scf_sel_array[0];
|
|
}
|
|
|
|
// Update statistics and occasionally burn up mass quantities of CPU time,
|
|
// if told to do so via scftorture.longwait. Otherwise, occasionally burn
|
|
// a little bit.
|
|
static void scf_handler(void *scfc_in)
|
|
{
|
|
int i;
|
|
int j;
|
|
unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand));
|
|
struct scf_check *scfcp = scfc_in;
|
|
|
|
if (likely(scfcp)) {
|
|
WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers.
|
|
if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in))))
|
|
atomic_inc(&n_mb_in_errs);
|
|
}
|
|
this_cpu_inc(scf_invoked_count);
|
|
if (longwait <= 0) {
|
|
if (!(r & 0xffc0))
|
|
udelay(r & 0x3f);
|
|
goto out;
|
|
}
|
|
if (r & 0xfff)
|
|
goto out;
|
|
r = (r >> 12);
|
|
if (longwait <= 0) {
|
|
udelay((r & 0xff) + 1);
|
|
goto out;
|
|
}
|
|
r = r % longwait + 1;
|
|
for (i = 0; i < r; i++) {
|
|
for (j = 0; j < 1000; j++) {
|
|
udelay(1000);
|
|
cpu_relax();
|
|
}
|
|
}
|
|
out:
|
|
if (unlikely(!scfcp))
|
|
return;
|
|
if (scfcp->scfc_wait)
|
|
WRITE_ONCE(scfcp->scfc_out, true);
|
|
else
|
|
kfree(scfcp);
|
|
}
|
|
|
|
// As above, but check for correct CPU.
|
|
static void scf_handler_1(void *scfc_in)
|
|
{
|
|
struct scf_check *scfcp = scfc_in;
|
|
|
|
if (likely(scfcp) && WARN_ONCE(smp_processor_id() != scfcp->scfc_cpu, "%s: Wanted CPU %d got CPU %d\n", __func__, scfcp->scfc_cpu, smp_processor_id())) {
|
|
atomic_inc(&n_errs);
|
|
}
|
|
scf_handler(scfcp);
|
|
}
|
|
|
|
// Randomly do an smp_call_function*() invocation.
|
|
static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp)
|
|
{
|
|
uintptr_t cpu;
|
|
int ret = 0;
|
|
struct scf_check *scfcp = NULL;
|
|
struct scf_selector *scfsp = scf_sel_rand(trsp);
|
|
|
|
if (use_cpus_read_lock)
|
|
cpus_read_lock();
|
|
else
|
|
preempt_disable();
|
|
if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) {
|
|
scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC);
|
|
if (WARN_ON_ONCE(!scfcp)) {
|
|
atomic_inc(&n_alloc_errs);
|
|
} else {
|
|
scfcp->scfc_cpu = -1;
|
|
scfcp->scfc_wait = scfsp->scfs_wait;
|
|
scfcp->scfc_out = false;
|
|
}
|
|
}
|
|
switch (scfsp->scfs_prim) {
|
|
case SCF_PRIM_RESCHED:
|
|
if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) {
|
|
cpu = torture_random(trsp) % nr_cpu_ids;
|
|
scfp->n_resched++;
|
|
resched_cpu(cpu);
|
|
}
|
|
break;
|
|
case SCF_PRIM_SINGLE:
|
|
cpu = torture_random(trsp) % nr_cpu_ids;
|
|
if (scfsp->scfs_wait)
|
|
scfp->n_single_wait++;
|
|
else
|
|
scfp->n_single++;
|
|
if (scfcp) {
|
|
scfcp->scfc_cpu = cpu;
|
|
barrier(); // Prevent race-reduction compiler optimizations.
|
|
scfcp->scfc_in = true;
|
|
}
|
|
ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait);
|
|
if (ret) {
|
|
if (scfsp->scfs_wait)
|
|
scfp->n_single_wait_ofl++;
|
|
else
|
|
scfp->n_single_ofl++;
|
|
kfree(scfcp);
|
|
scfcp = NULL;
|
|
}
|
|
break;
|
|
case SCF_PRIM_MANY:
|
|
if (scfsp->scfs_wait)
|
|
scfp->n_many_wait++;
|
|
else
|
|
scfp->n_many++;
|
|
if (scfcp) {
|
|
barrier(); // Prevent race-reduction compiler optimizations.
|
|
scfcp->scfc_in = true;
|
|
}
|
|
smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait);
|
|
break;
|
|
case SCF_PRIM_ALL:
|
|
if (scfsp->scfs_wait)
|
|
scfp->n_all_wait++;
|
|
else
|
|
scfp->n_all++;
|
|
if (scfcp) {
|
|
barrier(); // Prevent race-reduction compiler optimizations.
|
|
scfcp->scfc_in = true;
|
|
}
|
|
smp_call_function(scf_handler, scfcp, scfsp->scfs_wait);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
if (scfcp)
|
|
scfcp->scfc_out = true;
|
|
}
|
|
if (scfcp && scfsp->scfs_wait) {
|
|
if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) &&
|
|
!scfcp->scfc_out))
|
|
atomic_inc(&n_mb_out_errs); // Leak rather than trash!
|
|
else
|
|
kfree(scfcp);
|
|
barrier(); // Prevent race-reduction compiler optimizations.
|
|
}
|
|
if (use_cpus_read_lock)
|
|
cpus_read_unlock();
|
|
else
|
|
preempt_enable();
|
|
if (!(torture_random(trsp) & 0xfff))
|
|
schedule_timeout_uninterruptible(1);
|
|
}
|
|
|
|
// SCF test kthread. Repeatedly does calls to members of the
|
|
// smp_call_function() family of functions.
|
|
static int scftorture_invoker(void *arg)
|
|
{
|
|
int cpu;
|
|
int curcpu;
|
|
DEFINE_TORTURE_RANDOM(rand);
|
|
struct scf_statistics *scfp = (struct scf_statistics *)arg;
|
|
bool was_offline = false;
|
|
|
|
VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu);
|
|
cpu = scfp->cpu % nr_cpu_ids;
|
|
WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu)));
|
|
set_user_nice(current, MAX_NICE);
|
|
if (holdoff)
|
|
schedule_timeout_interruptible(holdoff * HZ);
|
|
|
|
VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id());
|
|
|
|
// Make sure that the CPU is affinitized appropriately during testing.
|
|
curcpu = raw_smp_processor_id();
|
|
WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids,
|
|
"%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n",
|
|
__func__, scfp->cpu, curcpu, nr_cpu_ids);
|
|
|
|
if (!atomic_dec_return(&n_started))
|
|
while (atomic_read_acquire(&n_started)) {
|
|
if (torture_must_stop()) {
|
|
VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu);
|
|
goto end;
|
|
}
|
|
schedule_timeout_uninterruptible(1);
|
|
}
|
|
|
|
VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu);
|
|
|
|
do {
|
|
scftorture_invoke_one(scfp, &rand);
|
|
while (cpu_is_offline(cpu) && !torture_must_stop()) {
|
|
schedule_timeout_interruptible(HZ / 5);
|
|
was_offline = true;
|
|
}
|
|
if (was_offline) {
|
|
set_cpus_allowed_ptr(current, cpumask_of(cpu));
|
|
was_offline = false;
|
|
}
|
|
cond_resched();
|
|
stutter_wait("scftorture_invoker");
|
|
} while (!torture_must_stop());
|
|
|
|
VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu);
|
|
end:
|
|
torture_kthread_stopping("scftorture_invoker");
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
scftorture_print_module_parms(const char *tag)
|
|
{
|
|
pr_alert(SCFTORT_FLAG
|
|
"--- %s: verbose=%d holdoff=%d longwait=%d nthreads=%d onoff_holdoff=%d onoff_interval=%d shutdown_secs=%d stat_interval=%d stutter=%d use_cpus_read_lock=%d, weight_resched=%d, weight_single=%d, weight_single_wait=%d, weight_many=%d, weight_many_wait=%d, weight_all=%d, weight_all_wait=%d\n", tag,
|
|
verbose, holdoff, longwait, nthreads, onoff_holdoff, onoff_interval, shutdown, stat_interval, stutter, use_cpus_read_lock, weight_resched, weight_single, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait);
|
|
}
|
|
|
|
static void scf_cleanup_handler(void *unused)
|
|
{
|
|
}
|
|
|
|
static void scf_torture_cleanup(void)
|
|
{
|
|
int i;
|
|
|
|
if (torture_cleanup_begin())
|
|
return;
|
|
|
|
WRITE_ONCE(scfdone, true);
|
|
if (nthreads)
|
|
for (i = 0; i < nthreads; i++)
|
|
torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task);
|
|
else
|
|
goto end;
|
|
smp_call_function(scf_cleanup_handler, NULL, 0);
|
|
torture_stop_kthread(scf_torture_stats, scf_torture_stats_task);
|
|
scf_torture_stats_print(); // -After- the stats thread is stopped!
|
|
kfree(scf_stats_p); // -After- the last stats print has completed!
|
|
scf_stats_p = NULL;
|
|
|
|
if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs))
|
|
scftorture_print_module_parms("End of test: FAILURE");
|
|
else if (torture_onoff_failures())
|
|
scftorture_print_module_parms("End of test: LOCK_HOTPLUG");
|
|
else
|
|
scftorture_print_module_parms("End of test: SUCCESS");
|
|
|
|
end:
|
|
torture_cleanup_end();
|
|
}
|
|
|
|
static int __init scf_torture_init(void)
|
|
{
|
|
long i;
|
|
int firsterr = 0;
|
|
unsigned long weight_resched1 = weight_resched;
|
|
unsigned long weight_single1 = weight_single;
|
|
unsigned long weight_single_wait1 = weight_single_wait;
|
|
unsigned long weight_many1 = weight_many;
|
|
unsigned long weight_many_wait1 = weight_many_wait;
|
|
unsigned long weight_all1 = weight_all;
|
|
unsigned long weight_all_wait1 = weight_all_wait;
|
|
|
|
if (!torture_init_begin(SCFTORT_STRING, verbose))
|
|
return -EBUSY;
|
|
|
|
scftorture_print_module_parms("Start of test");
|
|
|
|
if (weight_resched == -1 && weight_single == -1 && weight_single_wait == -1 &&
|
|
weight_many == -1 && weight_many_wait == -1 &&
|
|
weight_all == -1 && weight_all_wait == -1) {
|
|
weight_resched1 = 2 * nr_cpu_ids;
|
|
weight_single1 = 2 * nr_cpu_ids;
|
|
weight_single_wait1 = 2 * nr_cpu_ids;
|
|
weight_many1 = 2;
|
|
weight_many_wait1 = 2;
|
|
weight_all1 = 1;
|
|
weight_all_wait1 = 1;
|
|
} else {
|
|
if (weight_resched == -1)
|
|
weight_resched1 = 0;
|
|
if (weight_single == -1)
|
|
weight_single1 = 0;
|
|
if (weight_single_wait == -1)
|
|
weight_single_wait1 = 0;
|
|
if (weight_many == -1)
|
|
weight_many1 = 0;
|
|
if (weight_many_wait == -1)
|
|
weight_many_wait1 = 0;
|
|
if (weight_all == -1)
|
|
weight_all1 = 0;
|
|
if (weight_all_wait == -1)
|
|
weight_all_wait1 = 0;
|
|
}
|
|
if (weight_single1 == 0 && weight_single_wait1 == 0 &&
|
|
weight_many1 == 0 && weight_many_wait1 == 0 &&
|
|
weight_all1 == 0 && weight_all_wait1 == 0) {
|
|
VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense");
|
|
firsterr = -EINVAL;
|
|
goto unwind;
|
|
}
|
|
if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST))
|
|
scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false);
|
|
else if (weight_resched1)
|
|
VERBOSE_SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored");
|
|
scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false);
|
|
scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true);
|
|
scf_sel_add(weight_many1, SCF_PRIM_MANY, false);
|
|
scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true);
|
|
scf_sel_add(weight_all1, SCF_PRIM_ALL, false);
|
|
scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true);
|
|
scf_sel_dump();
|
|
|
|
if (onoff_interval > 0) {
|
|
firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (shutdown_secs > 0) {
|
|
firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (stutter > 0) {
|
|
firsterr = torture_stutter_init(stutter, stutter);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
|
|
// Worker tasks invoking smp_call_function().
|
|
if (nthreads < 0)
|
|
nthreads = num_online_cpus();
|
|
scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL);
|
|
if (!scf_stats_p) {
|
|
VERBOSE_SCFTORTOUT_ERRSTRING("out of memory");
|
|
firsterr = -ENOMEM;
|
|
goto unwind;
|
|
}
|
|
|
|
VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads\n", nthreads);
|
|
|
|
atomic_set(&n_started, nthreads);
|
|
for (i = 0; i < nthreads; i++) {
|
|
scf_stats_p[i].cpu = i;
|
|
firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i],
|
|
scf_stats_p[i].task);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
if (stat_interval > 0) {
|
|
firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task);
|
|
if (firsterr)
|
|
goto unwind;
|
|
}
|
|
|
|
torture_init_end();
|
|
return 0;
|
|
|
|
unwind:
|
|
torture_init_end();
|
|
scf_torture_cleanup();
|
|
return firsterr;
|
|
}
|
|
|
|
module_init(scf_torture_init);
|
|
module_exit(scf_torture_cleanup);
|