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Linux compat 3.7, kernel_thread()

Browse Source 
The preferred kernel interface for creating threads has been
kthread_create() for a long time now.  However, several of the
SPLAT tests still use the legacy kernel_thread() function which
has finally been dropped (mostly).

Update the condvar and rwlock SPLAT tests to use the modern
interface.  Frankly this is something we should have done a
long time ago.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #194
This commit is contained in:
Brian Behlendorf 2012-11-30 15:46:30 -08:00
parent 251677e98f
commit b84412a6e8
2 changed files with 61 additions and 66 deletions
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58
module/splat/splat-condvar.c
View File

@ -24,6 +24,7 @@
* Solaris Porting LAyer Tests (SPLAT) Condition Variable Tests.
\*****************************************************************************/
#include <linux/kthread.h>
#include <sys/condvar.h>
#include "splat-internal.h"
@ -51,7 +52,7 @@
#define SPLAT_CONDVAR_TEST5_DESC "Timeout thread, cv_wait_timeout()"
#define SPLAT_CONDVAR_TEST_MAGIC 0x115599DDUL
#define SPLAT_CONDVAR_TEST_NAME "condvar_test"
#define SPLAT_CONDVAR_TEST_NAME "condvar"
#define SPLAT_CONDVAR_TEST_COUNT 8
typedef struct condvar_priv {
@ -62,9 +63,9 @@ typedef struct condvar_priv {
} condvar_priv_t;
typedef struct condvar_thr {
int ct_id;
const char *ct_name;
condvar_priv_t *ct_cvp;
struct task_struct *ct_thread;
int ct_rc;
} condvar_thr_t;
@ -73,20 +74,17 @@ splat_condvar_test12_thread(void *arg)
{
condvar_thr_t *ct = (condvar_thr_t *)arg;
condvar_priv_t *cv = ct->ct_cvp;
char name[16];
ASSERT(cv->cv_magic == SPLAT_CONDVAR_TEST_MAGIC);
snprintf(name, sizeof(name),"%s%d",SPLAT_CONDVAR_TEST_NAME,ct->ct_id);
daemonize(name);
mutex_enter(&cv->cv_mtx);
splat_vprint(cv->cv_file, ct->ct_name,
"%s thread sleeping with %d waiters\n",
name, atomic_read(&cv->cv_condvar.cv_waiters));
ct->ct_thread->comm, atomic_read(&cv->cv_condvar.cv_waiters));
cv_wait(&cv->cv_condvar, &cv->cv_mtx);
splat_vprint(cv->cv_file, ct->ct_name,
"%s thread woken %d waiters remain\n",
name, atomic_read(&cv->cv_condvar.cv_waiters));
ct->ct_thread->comm, atomic_read(&cv->cv_condvar.cv_waiters));
mutex_exit(&cv->cv_mtx);
return 0;
@ -96,7 +94,6 @@ static int
splat_condvar_test1(struct file *file, void *arg)
{
int i, count = 0, rc = 0;
long pids[SPLAT_CONDVAR_TEST_COUNT];
condvar_thr_t ct[SPLAT_CONDVAR_TEST_COUNT];
condvar_priv_t cv;
@ -109,14 +106,16 @@ splat_condvar_test1(struct file *file, void *arg)
* long as we know how many we managed to create and should expect. */
for (i = 0; i < SPLAT_CONDVAR_TEST_COUNT; i++) {
ct[i].ct_cvp = &cv;
ct[i].ct_id = i;
ct[i].ct_name = SPLAT_CONDVAR_TEST1_NAME;
ct[i].ct_rc = 0;
ct[i].ct_thread = kthread_create(splat_condvar_test12_thread,
&ct[i], "%s/%d", SPLAT_CONDVAR_TEST_NAME, i);
pids[i] = kernel_thread(splat_condvar_test12_thread, &ct[i], 0);
if (pids[i] >= 0)
if (!IS_ERR(ct[i].ct_thread)) {
wake_up_process(ct[i].ct_thread);
count++;
}
}
/* Wait until all threads are waiting on the condition variable */
while (atomic_read(&cv.cv_condvar.cv_waiters) != count)
@ -160,7 +159,6 @@ static int
splat_condvar_test2(struct file *file, void *arg)
{
int i, count = 0, rc = 0;
long pids[SPLAT_CONDVAR_TEST_COUNT];
condvar_thr_t ct[SPLAT_CONDVAR_TEST_COUNT];
condvar_priv_t cv;
@ -173,14 +171,16 @@ splat_condvar_test2(struct file *file, void *arg)
* long as we know how many we managed to create and should expect. */
for (i = 0; i < SPLAT_CONDVAR_TEST_COUNT; i++) {
ct[i].ct_cvp = &cv;
ct[i].ct_id = i;
ct[i].ct_name = SPLAT_CONDVAR_TEST2_NAME;
ct[i].ct_rc = 0;
ct[i].ct_thread = kthread_create(splat_condvar_test12_thread,
&ct[i], "%s/%d", SPLAT_CONDVAR_TEST_NAME, i);
pids[i] = kernel_thread(splat_condvar_test12_thread, &ct[i], 0);
if (pids[i] > 0)
if (!IS_ERR(ct[i].ct_thread)) {
wake_up_process(ct[i].ct_thread);
count++;
}
}
/* Wait until all threads are waiting on the condition variable */
while (atomic_read(&cv.cv_condvar.cv_waiters) != count)
@ -208,17 +208,14 @@ splat_condvar_test34_thread(void *arg)
{
condvar_thr_t *ct = (condvar_thr_t *)arg;
condvar_priv_t *cv = ct->ct_cvp;
char name[16];
clock_t rc;
ASSERT(cv->cv_magic == SPLAT_CONDVAR_TEST_MAGIC);
snprintf(name, sizeof(name), "%s%d", SPLAT_CONDVAR_TEST_NAME, ct->ct_id);
daemonize(name);
mutex_enter(&cv->cv_mtx);
splat_vprint(cv->cv_file, ct->ct_name,
"%s thread sleeping with %d waiters\n",
name, atomic_read(&cv->cv_condvar.cv_waiters));
ct->ct_thread->comm, atomic_read(&cv->cv_condvar.cv_waiters));
/* Sleep no longer than 3 seconds, for this test we should
* actually never sleep that long without being woken up. */
@ -226,11 +223,12 @@ splat_condvar_test34_thread(void *arg)
if (rc == -1) {
ct->ct_rc = -ETIMEDOUT;
splat_vprint(cv->cv_file, ct->ct_name, "%s thread timed out, "
"should have been woken\n", name);
"should have been woken\n", ct->ct_thread->comm);
} else {
splat_vprint(cv->cv_file, ct->ct_name,
"%s thread woken %d waiters remain\n",
name, atomic_read(&cv->cv_condvar.cv_waiters));
ct->ct_thread->comm,
atomic_read(&cv->cv_condvar.cv_waiters));
}
mutex_exit(&cv->cv_mtx);
@ -242,7 +240,6 @@ static int
splat_condvar_test3(struct file *file, void *arg)
{
int i, count = 0, rc = 0;
long pids[SPLAT_CONDVAR_TEST_COUNT];
condvar_thr_t ct[SPLAT_CONDVAR_TEST_COUNT];
condvar_priv_t cv;
@ -255,14 +252,16 @@ splat_condvar_test3(struct file *file, void *arg)
* long as we know how many we managed to create and should expect. */
for (i = 0; i < SPLAT_CONDVAR_TEST_COUNT; i++) {
ct[i].ct_cvp = &cv;
ct[i].ct_id = i;
ct[i].ct_name = SPLAT_CONDVAR_TEST3_NAME;
ct[i].ct_rc = 0;
ct[i].ct_thread = kthread_create(splat_condvar_test34_thread,
&ct[i], "%s/%d", SPLAT_CONDVAR_TEST_NAME, i);
pids[i] = kernel_thread(splat_condvar_test34_thread, &ct[i], 0);
if (pids[i] >= 0)
if (!IS_ERR(ct[i].ct_thread)) {
wake_up_process(ct[i].ct_thread);
count++;
}
}
/* Wait until all threads are waiting on the condition variable */
while (atomic_read(&cv.cv_condvar.cv_waiters) != count)
@ -311,7 +310,6 @@ static int
splat_condvar_test4(struct file *file, void *arg)
{
int i, count = 0, rc = 0;
long pids[SPLAT_CONDVAR_TEST_COUNT];
condvar_thr_t ct[SPLAT_CONDVAR_TEST_COUNT];
condvar_priv_t cv;
@ -324,14 +322,16 @@ splat_condvar_test4(struct file *file, void *arg)
* long as we know how many we managed to create and should expect. */
for (i = 0; i < SPLAT_CONDVAR_TEST_COUNT; i++) {
ct[i].ct_cvp = &cv;
ct[i].ct_id = i;
ct[i].ct_name = SPLAT_CONDVAR_TEST3_NAME;
ct[i].ct_rc = 0;
ct[i].ct_thread = kthread_create(splat_condvar_test34_thread,
&ct[i], "%s/%d", SPLAT_CONDVAR_TEST_NAME, i);
pids[i] = kernel_thread(splat_condvar_test34_thread, &ct[i], 0);
if (pids[i] >= 0)
if (!IS_ERR(ct[i].ct_thread)) {
wake_up_process(ct[i].ct_thread);
count++;
}
}
/* Wait until all threads are waiting on the condition variable */
while (atomic_read(&cv.cv_condvar.cv_waiters) != count)

41
module/splat/splat-rwlock.c
View File

@ -82,7 +82,7 @@ typedef struct rw_priv {
typedef struct rw_thr {
const char *rwt_name;
rw_priv_t *rwt_rwp;
int rwt_id;
struct task_struct *rwt_thread;
} rw_thr_t;
void splat_init_rw_priv(rw_priv_t *rwp, struct file *file)
@ -106,17 +106,15 @@ splat_rwlock_wr_thr(void *arg)
rw_thr_t *rwt = (rw_thr_t *)arg;
rw_priv_t *rwp = rwt->rwt_rwp;
uint8_t rnd;
char name[16];
ASSERT(rwp->rw_magic == SPLAT_RWLOCK_TEST_MAGIC);
snprintf(name, sizeof(name), "rwlock_wr_thr%d", rwt->rwt_id);
daemonize(name);
get_random_bytes((void *)&rnd, 1);
msleep((unsigned int)rnd);
splat_vprint(rwp->rw_file, rwt->rwt_name,
"%s trying to acquire rwlock (%d holding/%d waiting)\n",
name, rwp->rw_holders, rwp->rw_waiters);
rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
spin_lock(&rwp->rw_lock);
rwp->rw_waiters++;
spin_unlock(&rwp->rw_lock);
@ -128,7 +126,7 @@ splat_rwlock_wr_thr(void *arg)
spin_unlock(&rwp->rw_lock);
splat_vprint(rwp->rw_file, rwt->rwt_name,
"%s acquired rwlock (%d holding/%d waiting)\n",
name, rwp->rw_holders, rwp->rw_waiters);
rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
/* Wait for control thread to signal we can release the write lock */
wait_event_interruptible(rwp->rw_waitq, splat_locked_test(&rwp->rw_lock,
@ -140,7 +138,7 @@ splat_rwlock_wr_thr(void *arg)
spin_unlock(&rwp->rw_lock);
splat_vprint(rwp->rw_file, rwt->rwt_name,
"%s dropped rwlock (%d holding/%d waiting)\n",
name, rwp->rw_holders, rwp->rw_waiters);
rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
rw_exit(&rwp->rw_rwlock);
@ -153,21 +151,19 @@ splat_rwlock_rd_thr(void *arg)
rw_thr_t *rwt = (rw_thr_t *)arg;
rw_priv_t *rwp = rwt->rwt_rwp;
uint8_t rnd;
char name[16];
ASSERT(rwp->rw_magic == SPLAT_RWLOCK_TEST_MAGIC);
snprintf(name, sizeof(name), "rwlock_rd_thr%d", rwt->rwt_id);
daemonize(name);
get_random_bytes((void *)&rnd, 1);
msleep((unsigned int)rnd);
/* Don't try and take the semaphore until after someone has it */
wait_event_interruptible(rwp->rw_waitq, splat_locked_test(&rwp->rw_lock,
rwp->rw_holders > 0));
wait_event_interruptible(rwp->rw_waitq,
splat_locked_test(&rwp->rw_lock, rwp->rw_holders > 0));
splat_vprint(rwp->rw_file, rwt->rwt_name,
"%s trying to acquire rwlock (%d holding/%d waiting)\n",
name, rwp->rw_holders, rwp->rw_waiters);
rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
spin_lock(&rwp->rw_lock);
rwp->rw_waiters++;
spin_unlock(&rwp->rw_lock);
@ -179,7 +175,7 @@ splat_rwlock_rd_thr(void *arg)
spin_unlock(&rwp->rw_lock);
splat_vprint(rwp->rw_file, rwt->rwt_name,
"%s acquired rwlock (%d holding/%d waiting)\n",
name, rwp->rw_holders, rwp->rw_waiters);
rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
/* Wait for control thread to signal we can release the read lock */
wait_event_interruptible(rwp->rw_waitq, splat_locked_test(&rwp->rw_lock,
@ -191,7 +187,7 @@ splat_rwlock_rd_thr(void *arg)
spin_unlock(&rwp->rw_lock);
splat_vprint(rwp->rw_file, rwt->rwt_name,
"%s dropped rwlock (%d holding/%d waiting)\n",
name, rwp->rw_holders, rwp->rw_waiters);
rwt->rwt_thread->comm, rwp->rw_holders, rwp->rw_waiters);
rw_exit(&rwp->rw_rwlock);
@ -202,7 +198,6 @@ static int
splat_rwlock_test1(struct file *file, void *arg)
{
int i, count = 0, rc = 0;
long pids[SPLAT_RWLOCK_TEST_COUNT];
rw_thr_t rwt[SPLAT_RWLOCK_TEST_COUNT];
rw_priv_t *rwp;
@ -214,23 +209,23 @@ splat_rwlock_test1(struct file *file, void *arg)
/* Create some threads, the exact number isn't important just as
* long as we know how many we managed to create and should expect. */
for (i = 0; i < SPLAT_RWLOCK_TEST_COUNT; i++) {
rwt[i].rwt_rwp = rwp;
rwt[i].rwt_id = i;
rwt[i].rwt_name = SPLAT_RWLOCK_TEST1_NAME;
/* The first thread will be the writer */
if (i == 0)
pids[i] = kernel_thread(splat_rwlock_wr_thr, &rwt[i], 0);
rwt[i].rwt_thread = kthread_create(splat_rwlock_wr_thr,
&rwt[i], "%s/%d", SPLAT_RWLOCK_TEST_NAME, i);
else
pids[i] = kernel_thread(splat_rwlock_rd_thr, &rwt[i], 0);
rwt[i].rwt_thread = kthread_create(splat_rwlock_rd_thr,
&rwt[i], "%s/%d", SPLAT_RWLOCK_TEST_NAME, i);
if (pids[i] >= 0)
if (!IS_ERR(rwt[i].rwt_thread)) {
wake_up_process(rwt[i].rwt_thread);
count++;
}
}
/* Wait for the writer */
while (splat_locked_test(&rwp->rw_lock, rwp->rw_holders == 0)) {