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Date: Sun, 30 Dec 2012 18:47:13 -0800
From: Michel Lespinasse <walken@...gle.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
David Howells <dhowells@...hat.com>
Cc: linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>
Subject: [PATCH 1/2] add spinlock test to synchro-test module
Signed-off-by: Michel Lespinasse <walken@...gle.com>
---
kernel/synchro-test.c | 76 +++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 70 insertions(+), 6 deletions(-)
diff --git a/kernel/synchro-test.c b/kernel/synchro-test.c
index 76e3ad39505f..9abfa955d69e 100644
--- a/kernel/synchro-test.c
+++ b/kernel/synchro-test.c
@@ -41,6 +41,7 @@
# define VALIDATE_OPERATORS
#endif
+static int numsp;
static int nummx;
static int numsm, seminit = 4;
static int numrd, numwr, numdg;
@@ -54,6 +55,9 @@ MODULE_LICENSE("GPL");
module_param_named(v, verbose, int, 0);
MODULE_PARM_DESC(verbose, "Verbosity");
+module_param_named(sp, numsp, int, 0);
+MODULE_PARM_DESC(numsp, "Number of spinlock threads");
+
module_param_named(mx, nummx, int, 0);
MODULE_PARM_DESC(nummx, "Number of mutex threads");
@@ -85,6 +89,7 @@ module_param(do_sched, int, 0);
MODULE_PARM_DESC(do_sched, "True if each thread should schedule regularly");
/* the semaphores under test */
+static spinlock_t ____cacheline_aligned spinlock;
static struct mutex ____cacheline_aligned mutex;
static struct semaphore ____cacheline_aligned sem;
static struct rw_semaphore ____cacheline_aligned rwsem;
@@ -92,18 +97,21 @@ static struct rw_semaphore ____cacheline_aligned rwsem;
static atomic_t ____cacheline_aligned do_stuff = ATOMIC_INIT(0);
#ifdef VALIDATE_OPERATORS
+static atomic_t ____cacheline_aligned spinlocks = ATOMIC_INIT(0);
static atomic_t ____cacheline_aligned mutexes = ATOMIC_INIT(0);
static atomic_t ____cacheline_aligned semaphores = ATOMIC_INIT(0);
static atomic_t ____cacheline_aligned readers = ATOMIC_INIT(0);
static atomic_t ____cacheline_aligned writers = ATOMIC_INIT(0);
#endif
+static unsigned int ____cacheline_aligned spinlocks_taken [MAX_THREADS];
static unsigned int ____cacheline_aligned mutexes_taken [MAX_THREADS];
static unsigned int ____cacheline_aligned semaphores_taken [MAX_THREADS];
static unsigned int ____cacheline_aligned reads_taken [MAX_THREADS];
static unsigned int ____cacheline_aligned writes_taken [MAX_THREADS];
static unsigned int ____cacheline_aligned downgrades_taken [MAX_THREADS];
+static struct completion ____cacheline_aligned sp_comp[MAX_THREADS];
static struct completion ____cacheline_aligned mx_comp[MAX_THREADS];
static struct completion ____cacheline_aligned sm_comp[MAX_THREADS];
static struct completion ____cacheline_aligned rd_comp[MAX_THREADS];
@@ -130,6 +138,23 @@ do { \
#define CHECK(var, cond, val) do {} while(0)
#endif
+static inline void do_spin_lock(unsigned int N)
+{
+ spin_lock(&spinlock);
+
+ ACCOUNT(spinlocks, N);
+ TRACK(spinlocks, inc);
+ CHECK(spinlocks, ==, 1);
+}
+
+static inline void do_spin_unlock(unsigned int N)
+{
+ CHECK(spinlocks, ==, 1);
+ TRACK(spinlocks, dec);
+
+ spin_unlock(&spinlock);
+}
+
static inline void do_mutex_lock(unsigned int N)
{
mutex_lock(&mutex);
@@ -221,6 +246,27 @@ static inline void sched(void)
schedule();
}
+static int spinlocker(void *arg)
+{
+ unsigned int N = (unsigned long) arg;
+
+ set_user_nice(current, 19);
+
+ while (atomic_read(&do_stuff)) {
+ do_spin_lock(N);
+ if (load)
+ udelay(load);
+ do_spin_unlock(N);
+ sched();
+ if (interval)
+ udelay(interval);
+ }
+
+ if (verbose >= 2)
+ printk("%s: done\n", current->comm);
+ complete_and_exit(&sp_comp[N], 0);
+}
+
static int mutexer(void *arg)
{
unsigned int N = (unsigned long) arg;
@@ -388,9 +434,11 @@ static unsigned int total(const char *what, unsigned int counts[], int num)
static int __init do_tests(void)
{
unsigned long loop;
- unsigned int mutex_total, sem_total, rd_total, wr_total, dg_total;
+ unsigned int spinlock_total, mutex_total, sem_total;
+ unsigned int rd_total, wr_total, dg_total;
- if (nummx < 0 || nummx > MAX_THREADS ||
+ if (numsp < 0 || numsp > MAX_THREADS ||
+ nummx < 0 || nummx > MAX_THREADS ||
numsm < 0 || numsm > MAX_THREADS ||
numrd < 0 || numrd > MAX_THREADS ||
numwr < 0 || numwr > MAX_THREADS ||
@@ -404,12 +452,12 @@ static int __init do_tests(void)
return -ERANGE;
}
- if ((nummx | numsm | numrd | numwr | numdg) == 0) {
+ if ((numsp | nummx | numsm | numrd | numwr | numdg) == 0) {
int num = num_online_cpus();
if (num > MAX_THREADS)
num = MAX_THREADS;
- nummx = numsm = numrd = numwr = numdg = num;
+ numsp = nummx = numsm = numrd = numwr = numdg = num;
load = 1;
interval = 1;
@@ -420,6 +468,7 @@ static int __init do_tests(void)
if (verbose)
printk("\nStarting synchronisation primitive tests...\n");
+ spin_lock_init(&spinlock);
mutex_init(&mutex);
sema_init(&sem, seminit);
init_rwsem(&rwsem);
@@ -427,6 +476,12 @@ static int __init do_tests(void)
/* kick off all the children */
for (loop = 0; loop < MAX_THREADS; loop++) {
+ if (loop < numsp) {
+ init_completion(&sp_comp[loop]);
+ kthread_run(spinlocker, (void *) loop,
+ "Spinlock%lu", loop);
+ }
+
if (loop < nummx) {
init_completion(&mx_comp[loop]);
kthread_run(mutexer, (void *) loop, "Mutex%lu", loop);
@@ -460,6 +515,9 @@ static int __init do_tests(void)
add_timer(&timer);
/* now wait until it's all done */
+ for (loop = 0; loop < numsp; loop++)
+ wait_for_completion(&sp_comp[loop]);
+
for (loop = 0; loop < nummx; loop++)
wait_for_completion(&mx_comp[loop]);
@@ -478,10 +536,14 @@ static int __init do_tests(void)
atomic_set(&do_stuff, 0);
del_timer(&timer);
+ if (spin_is_locked(&spinlock))
+ printk(KERN_ERR "Spinlock is still locked!\n");
+
if (mutex_is_locked(&mutex))
printk(KERN_ERR "Mutex is still locked!\n");
/* count up */
+ spinlock_total = total("SP ", spinlocks_taken, numsp);
mutex_total = total("MTX", mutexes_taken, nummx);
sem_total = total("SEM", semaphores_taken, numsm);
rd_total = total("RD ", reads_taken, numrd);
@@ -490,6 +552,7 @@ static int __init do_tests(void)
/* print the results */
if (verbose) {
+ printk("spinlocks taken: %u\n", spinlock_total);
printk("mutexes taken: %u\n", mutex_total);
printk("semaphores taken: %u\n", sem_total);
printk("reads taken: %u\n", rd_total);
@@ -501,10 +564,11 @@ static int __init do_tests(void)
sprintf(buf, "%d/%d", interval, load);
- printk("%3d %3d %3d %3d %3d %c %5s %9u %9u %9u %9u %9u\n",
- nummx, numsm, numrd, numwr, numdg,
+ printk("%3d %3d %3d %3d %3d %3d %c %5s %9u %9u %9u %9u %9u %9u\n",
+ numsp, nummx, numsm, numrd, numwr, numdg,
do_sched ? 's' : '-',
buf,
+ spinlock_total,
mutex_total,
sem_total,
rd_total,
--
1.7.7.3
--
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