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Merge commit 'refs/top-bases/linux-unused' into linux-unused

This commit is contained in:
Brian Behlendorf 2009-08-04 15:58:25 -07:00
parent 393bfcf45e f88cbd6535
commit 628a3cb70d
6 changed files with 134 additions and 133 deletions
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3
ChangeLog
View File

@ -54,9 +54,6 @@
* module/zcommon/zfs_prop.c: Export new quota related symbols.
* lib/libzfs/libzfs_util.c: Increase buffer size for nvlist which
is needed for large configurations.
* lib/libzpool/kernel.c: Reimplement user kthreads based on pthread
thread specific data. This resolves previous scalabily concerns about
the cost of calling curthread which previously required a list walk.
* Bug fixes:
* lib/libspl/include/sys/zfs_debug.h: Removed duplicate file.

40
cmd/ztest/ztest.c
View File

@ -141,6 +141,7 @@ typedef struct ztest_args {
objset_t *za_os;
zilog_t *za_zilog;
kthread_t *za_thread;
kt_did_t za_threadid;
uint64_t za_instance;
uint64_t za_random;
uint64_t za_diroff;
@ -156,7 +157,6 @@ typedef struct ztest_args {
ztest_block_tag_t za_wbt;
dmu_object_info_t za_doi;
dmu_buf_t *za_dbuf;
boolean_t za_exited;
} ztest_args_t;
typedef void ztest_func_t(ztest_args_t *);
@ -253,8 +253,6 @@ typedef struct ztest_shared {
kmutex_t zs_sync_lock[ZTEST_SYNC_LOCKS];
uint64_t zs_seq[ZTEST_SYNC_LOCKS];
ztest_cb_list_t zs_cb_list;
kmutex_t zs_thr_lock;
kcondvar_t zs_thr_cv;
} ztest_shared_t;
static char ztest_dev_template[] = "%s/%s.%llua";
@ -266,7 +264,6 @@ static int ztest_dump_core = 1;
static uint64_t metaslab_sz;
static boolean_t ztest_exiting;
static boolean_t resume_thr_exited;
extern uint64_t metaslab_gang_bang;
extern uint64_t metaslab_df_alloc_threshold;
@ -3822,8 +3819,6 @@ ztest_resume_thread(void *arg)
ztest_resume(spa);
}
resume_thr_exited = B_TRUE;
thread_exit();
return (NULL);
}
@ -3889,13 +3884,6 @@ ztest_thread(void *arg)
break;
}
mutex_enter(&zs->zs_thr_lock);
za->za_exited = B_TRUE;
mutex_exit(&zs->zs_thr_lock);
/* Announce that the thread has finished */
cv_broadcast(&zs->zs_thr_cv);
thread_exit();
return (NULL);
}
@ -3912,14 +3900,13 @@ ztest_run(char *pool)
spa_t *spa;
char name[100];
kthread_t *resume_thread;
kt_did_t resume_id;
ztest_exiting = B_FALSE;
mutex_init(&zs->zs_vdev_lock, NULL, MUTEX_DEFAULT, NULL);
rw_init(&zs->zs_name_lock, NULL, RW_DEFAULT, NULL);
mutex_init(&zs->zs_cb_list.zcl_callbacks_lock,NULL,MUTEX_DEFAULT,NULL);
mutex_init(&zs->zs_thr_lock, NULL, MUTEX_DEFAULT, NULL);
cv_init(&zs->zs_thr_cv, NULL, CV_DEFAULT, NULL);
list_create(&zs->zs_cb_list.zcl_callbacks, sizeof (ztest_cb_data_t),
offsetof(ztest_cb_data_t, zcd_node));
@ -3992,9 +3979,9 @@ ztest_run(char *pool)
/*
* Create a thread to periodically resume suspended I/O.
*/
resume_thr_exited = B_FALSE;
VERIFY3P((resume_thread = thread_create(NULL, 0, ztest_resume_thread,
spa, TS_RUN, NULL, 0, 0)), !=, NULL);
spa, THR_BOUND, NULL, 0, 0)), !=, NULL);
resume_id = resume_thread->t_tid;
/*
* Verify that we can safely inquire about about any object,
@ -4070,18 +4057,13 @@ ztest_run(char *pool)
za[d].za_zilog = zil_open(za[d].za_os, NULL);
}
za[t].za_exited = B_FALSE;
VERIFY3P((za[t].za_thread = thread_create(NULL, 0, ztest_thread,
&za[t], TS_RUN, NULL, 0, 0)), !=, NULL);
&za[t], THR_BOUND, NULL, 0, 0)), !=, NULL);
za[t].za_threadid = za[t].za_thread->t_tid;
}
while (--t >= 0) {
mutex_enter(&zs->zs_thr_lock);
while (!za[t].za_exited)
cv_wait(&zs->zs_thr_cv, &zs->zs_thr_lock);
mutex_exit(&zs->zs_thr_lock);
VERIFY(thread_join(za[t].za_threadid, NULL, NULL) == 0);
if (t < zopt_datasets) {
zil_close(za[t].za_zilog);
dmu_objset_close(za[t].za_os);
@ -4120,11 +4102,7 @@ ztest_run(char *pool)
/* Kill the resume thread */
ztest_exiting = B_TRUE;
/* Wait for the resume thread to exit */
while (!resume_thr_exited)
(void) poll(NULL, 0, 200);
VERIFY(thread_join(resume_id, NULL, NULL) == 0);
ztest_resume(spa);
/*
@ -4140,8 +4118,6 @@ ztest_run(char *pool)
list_destroy(&zs->zs_cb_list.zcl_callbacks);
cv_destroy(&zs->zs_thr_cv);
mutex_destroy(&zs->zs_thr_lock);
mutex_destroy(&zs->zs_cb_list.zcl_callbacks_lock);
rw_destroy(&zs->zs_name_lock);
mutex_destroy(&zs->zs_vdev_lock);

20
lib/libzpool/include/sys/zfs_context.h
View File

@ -151,34 +151,34 @@ extern void vpanic(const char *, __va_list);
/*
* Threads
*/
#define THR_BOUND 0x00000001
#define TS_RUN 0x00000002
#define STACK_SIZE 8192 /* x86/x64 */
typedef void (*thread_func_t)(void);
typedef void (*thread_func_arg_t)(void *);
typedef void (*thread_func_t)(void *);
typedef pthread_t kt_did_t;
typedef struct kthread {
list_node_t t_node;
kt_did_t t_tid;
thread_func_t t_func;
void * t_arg;
pthread_attr_t t_attr;
} kthread_t;
/* XXX tsd_create()/tsd_destroy() missing */
#define tsd_get(key) pthread_getspecific(key)
#define tsd_set(key, val) pthread_setspecific(key, val)
#define curthread zk_thread_current()
#define thread_exit zk_thread_exit
#define thread_create(stk, stksize, func, arg, len, pp, state, pri) \
zk_thread_create(stk, stksize, (thread_func_t) func, arg, len, \
NULL, state, pri)
zk_thread_create(stk, stksize, (thread_func_t)func, arg, \
len, NULL, state, pri)
#define thread_join(tid, dtid, status) \
zk_thread_join(tid, dtid, status)
extern kthread_t *zk_thread_current(void);
extern void zk_thread_exit(void);
extern kthread_t *zk_thread_create(caddr_t stk, size_t stksize,
thread_func_t func, void *arg, size_t len,
void *pp, int state, pri_t pri);
extern int zk_thread_join(kt_did_t tid, kthread_t *dtid, void **status);
#define issig(why) (FALSE)
#define ISSIG(thr, why) (FALSE)
@ -310,7 +310,7 @@ extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t);
extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
extern void taskq_destroy(taskq_t *);
extern void taskq_wait(taskq_t *);
extern int taskq_member(taskq_t *, kthread_t *);
extern int taskq_member(taskq_t *, void *);
extern void system_taskq_init(void);
extern void system_taskq_fini(void);

178
lib/libzpool/kernel.c
View File

@ -57,141 +57,155 @@ struct utsname utsname = {
* =========================================================================
*/
/* NOTE: Tracking each tid on a list and using it for curthread lookups
* is slow at best but it provides an easy way to provide a kthread
* style API on top of pthreads. For now we just want ztest to work
* to validate correctness. Performance is not much of an issue
* since that is what the in-kernel version is for. That said
* reworking this to track the kthread_t structure as thread
* specific data would be probably the best way to speed this up.
*/
pthread_cond_t kthread_cond = PTHREAD_COND_INITIALIZER;
pthread_mutex_t kthread_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_key_t kthread_key;
int kthread_nr = 0;
list_t kthread_list;
static int
thread_count(void)
{
kthread_t *kt;
int count = 0;
for (kt = list_head(&kthread_list); kt != NULL;
kt = list_next(&kthread_list, kt))
count++;
return count;
}
static void
thread_init(void)
{
kthread_t *kt;
VERIFY3S(pthread_key_create(&kthread_key, NULL), ==, 0);
/* Initialize list for tracking kthreads */
list_create(&kthread_list, sizeof (kthread_t),
offsetof(kthread_t, t_node));
/* Create entry for primary kthread */
kt = umem_zalloc(sizeof(kthread_t), UMEM_NOFAIL);
kt->t_tid = pthread_self();
kt->t_func = NULL;
VERIFY3S(pthread_setspecific(kthread_key, kt), ==, 0);
/* Only the main thread should be running at the moment */
ASSERT3S(kthread_nr, ==, 0);
kthread_nr = 1;
list_link_init(&kt->t_node);
VERIFY3U(kt->t_tid = pthread_self(), !=, 0);
VERIFY3S(pthread_attr_init(&kt->t_attr), ==, 0);
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
list_insert_head(&kthread_list, kt);
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
}
static void
thread_fini(void)
{
kthread_t *kt = curthread;
ASSERT(pthread_equal(kt->t_tid, pthread_self()));
ASSERT3P(kt->t_func, ==, NULL);
umem_free(kt, sizeof(kthread_t));
kthread_t *kt;
struct timespec ts = { 0 };
int count;
/* Wait for all threads to exit via thread_exit() */
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
while ((count = thread_count()) > 1) {
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += 1;
pthread_cond_timedwait(&kthread_cond, &kthread_lock, &ts);
}
kthread_nr--; /* Main thread is exiting */
while (kthread_nr > 0)
VERIFY3S(pthread_cond_wait(&kthread_cond, &kthread_lock), ==,
0);
ASSERT3S(kthread_nr, ==, 0);
ASSERT3S(thread_count(), ==, 1);
kt = list_head(&kthread_list);
list_remove(&kthread_list, kt);
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
VERIFY3S(pthread_key_delete(kthread_key), ==, 0);
VERIFY(pthread_attr_destroy(&kt->t_attr) == 0);
umem_free(kt, sizeof(kthread_t));
/* Cleanup list for tracking kthreads */
list_destroy(&kthread_list);
}
kthread_t *
zk_thread_current(void)
{
kthread_t *kt = pthread_getspecific(kthread_key);
kt_did_t tid = pthread_self();
kthread_t *kt;
int count = 1;
ASSERT3P(kt, !=, NULL);
/*
* Because a newly created thread may call zk_thread_current()
* before the thread parent has had time to add the thread's tid
* to our lookup list. We will loop as long as there are tid
* which have not yet been set which must be one of ours.
* Yes it's a hack, at some point we can just use native pthreads.
*/
while (count > 0) {
count = 0;
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
for (kt = list_head(&kthread_list); kt != NULL;
kt = list_next(&kthread_list, kt)) {
return kt;
}
if (kt->t_tid == tid) {
VERIFY3S(pthread_mutex_unlock(
&kthread_lock), ==, 0);
return kt;
}
void *
zk_thread_helper(void *arg)
{
kthread_t *kt = (kthread_t *) arg;
VERIFY3S(pthread_setspecific(kthread_key, kt), ==, 0);
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
kthread_nr++;
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
kt->t_tid = pthread_self();
((thread_func_arg_t) kt->t_func)(kt->t_arg);
/* Unreachable, thread must exit with thread_exit() */
abort();
if (kt->t_tid == (kt_did_t)-1)
count++;
}
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
}
/* Unreachable */
ASSERT(0);
return NULL;
}
kthread_t *
zk_thread_create(caddr_t stk, size_t stksize, thread_func_t func, void *arg,
zk_thread_create(caddr_t stk, size_t stksize, thread_func_t func, void *arg,
size_t len, void *pp, int state, pri_t pri)
{
kthread_t *kt;
pthread_t tid;
pthread_attr_t attr;
size_t stack;
/*
* Due to a race when getting/setting the thread ID, currently only
* detached threads are supported.
*/
ASSERT3S(state & ~TS_RUN, ==, 0);
kt = umem_zalloc(sizeof(kthread_t), UMEM_NOFAIL);
kt->t_func = func;
kt->t_arg = arg;
kt->t_tid = (kt_did_t)-1;
list_link_init(&kt->t_node);
VERIFY(pthread_attr_init(&kt->t_attr) == 0);
/*
* The Solaris kernel stack size in x86/x64 is 8K, so we reduce the
* default stack size in userspace, for sanity checking.
*
* PTHREAD_STACK_MIN is the stack required for a NULL procedure in
* userspace.
*
* XXX: Stack size for other architectures is not being taken into
* account.
*/
stack = PTHREAD_STACK_MIN + MAX(stksize, STACK_SIZE);
VERIFY3S(pthread_attr_init(&attr), ==, 0);
VERIFY3S(pthread_attr_setstacksize(&attr, stack), ==, 0);
VERIFY3S(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED),
==, 0);
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
list_insert_head(&kthread_list, kt);
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
VERIFY3S(pthread_create(&tid, &attr, &zk_thread_helper, kt), ==, 0);
VERIFY3S(pthread_attr_destroy(&attr), ==, 0);
VERIFY3U(pthread_create(&kt->t_tid, &kt->t_attr,
(void *(*)(void *))func, arg), ==, 0);
return kt;
}
int
zk_thread_join(kt_did_t tid, kthread_t *dtid, void **status)
{
return pthread_join(tid, status);
}
void
zk_thread_exit(void)
{
kthread_t *kt = curthread;
kthread_t *kt;
ASSERT(pthread_equal(kt->t_tid, pthread_self()));
VERIFY3P(kt = curthread, !=, NULL);
VERIFY3S(pthread_mutex_lock(&kthread_lock), ==, 0);
list_remove(&kthread_list, kt);
VERIFY3S(pthread_mutex_unlock(&kthread_lock), ==, 0);
VERIFY(pthread_attr_destroy(&kt->t_attr) == 0);
umem_free(kt, sizeof(kthread_t));
pthread_mutex_lock(&kthread_lock);
kthread_nr--;
pthread_mutex_unlock(&kthread_lock);
pthread_cond_broadcast(&kthread_cond);
pthread_exit(NULL);
}

22
lib/libzpool/taskq.c
View File

@ -43,6 +43,7 @@ struct taskq {
kcondvar_t tq_dispatch_cv;
kcondvar_t tq_wait_cv;
kthread_t **tq_threadlist;
kt_did_t *tq_idlist;
int tq_flags;
int tq_active;
int tq_nthreads;
@ -134,7 +135,7 @@ taskq_wait(taskq_t *tq)
mutex_exit(&tq->tq_lock);
}
static void
static void *
taskq_thread(void *arg)
{
taskq_t *tq = arg;
@ -164,6 +165,7 @@ taskq_thread(void *arg)
cv_broadcast(&tq->tq_wait_cv);
mutex_exit(&tq->tq_lock);
thread_exit();
return (NULL);
}
/*ARGSUSED*/
@ -198,8 +200,10 @@ taskq_create(const char *name, int nthreads, pri_t pri,
tq->tq_maxalloc = maxalloc;
tq->tq_task.task_next = &tq->tq_task;
tq->tq_task.task_prev = &tq->tq_task;
tq->tq_threadlist = kmem_alloc(tq->tq_nthreads * sizeof(kthread_t *),
KM_SLEEP);
VERIFY3P((tq->tq_threadlist = kmem_alloc(tq->tq_nthreads *
sizeof(kthread_t *), KM_SLEEP)), !=, NULL);
VERIFY3P((tq->tq_idlist = kmem_alloc(tq->tq_nthreads *
sizeof(kt_did_t), KM_SLEEP)), !=, NULL);
if (flags & TASKQ_PREPOPULATE) {
mutex_enter(&tq->tq_lock);
@ -210,7 +214,8 @@ taskq_create(const char *name, int nthreads, pri_t pri,
for (t = 0; t < tq->tq_nthreads; t++) {
VERIFY((tq->tq_threadlist[t] = thread_create(NULL, 0,
taskq_thread, tq, TS_RUN, NULL, 0, 0)) != NULL);
taskq_thread, tq, THR_BOUND, NULL, 0, 0)) != NULL);
tq->tq_idlist[t] = tq->tq_threadlist[t]->t_tid;
}
return (tq);
@ -219,6 +224,7 @@ taskq_create(const char *name, int nthreads, pri_t pri,
void
taskq_destroy(taskq_t *tq)
{
int t;
int nthreads = tq->tq_nthreads;
taskq_wait(tq);
@ -239,7 +245,11 @@ taskq_destroy(taskq_t *tq)
mutex_exit(&tq->tq_lock);
for (t = 0; t < nthreads; t++)
VERIFY3S(thread_join(tq->tq_idlist[t], NULL, NULL), ==, 0);
kmem_free(tq->tq_threadlist, nthreads * sizeof(kthread_t *));
kmem_free(tq->tq_idlist, nthreads * sizeof(kt_did_t));
rw_destroy(&tq->tq_threadlock);
mutex_destroy(&tq->tq_lock);
@ -250,7 +260,7 @@ taskq_destroy(taskq_t *tq)
}
int
taskq_member(taskq_t *tq, kthread_t *t)
taskq_member(taskq_t *tq, void *t)
{
int i;
@ -258,7 +268,7 @@ taskq_member(taskq_t *tq, kthread_t *t)
return (1);
for (i = 0; i < tq->tq_nthreads; i++)
if (tq->tq_threadlist[i] == t)
if (tq->tq_threadlist[i] == (kthread_t *)t)
return (1);
return (0);

4
module/zfs/txg.c
View File

@ -446,6 +446,8 @@ txg_sync_thread(dsl_pool_t *dp)
rw_exit(&tx->tx_suspend);
cv_broadcast(&tx->tx_sync_done_cv);
}
thread_exit();
}
static void
@ -490,6 +492,8 @@ txg_quiesce_thread(dsl_pool_t *dp)
cv_broadcast(&tx->tx_sync_more_cv);
cv_broadcast(&tx->tx_quiesce_done_cv);
}
thread_exit();
}
/*