Author: avg
Date: Thu Jan 16 14:42:08 2014
New Revision: 260748
URL: http://svnweb.freebsd.org/changeset/base/260748
Log:
MFC r258630: 734 taskq_dispatch_prealloc() desired
Modified:
stable/9/cddl/contrib/opensolaris/lib/libzpool/common/sys/zfs_context.h
stable/9/cddl/contrib/opensolaris/lib/libzpool/common/taskq.c
Directory Properties:
stable/9/cddl/contrib/opensolaris/ (props changed)
Modified:
stable/9/cddl/contrib/opensolaris/lib/libzpool/common/sys/zfs_context.h
==============================================================================
--- stable/9/cddl/contrib/opensolaris/lib/libzpool/common/sys/zfs_context.h
Thu Jan 16 14:37:50 2014 (r260747)
+++ stable/9/cddl/contrib/opensolaris/lib/libzpool/common/sys/zfs_context.h
Thu Jan 16 14:42:08 2014 (r260748)
@@ -23,6 +23,9 @@
* Copyright (c) 2013 by Delphix. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. All rights reserved.
*/
+/*
+ * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
+ */
#ifndef _SYS_ZFS_CONTEXT_H
#define _SYS_ZFS_CONTEXT_H
@@ -365,6 +368,16 @@ typedef struct taskq taskq_t;
typedef uintptr_t taskqid_t;
typedef void (task_func_t)(void *);
+typedef struct taskq_ent {
+ struct taskq_ent *tqent_next;
+ struct taskq_ent *tqent_prev;
+ task_func_t *tqent_func;
+ void *tqent_arg;
+ uintptr_t tqent_flags;
+} taskq_ent_t;
+
+#define TQENT_FLAG_PREALLOC 0x1 /* taskq_dispatch_ent used */
+
#define TASKQ_PREPOPULATE 0x0001
#define TASKQ_CPR_SAFE 0x0002 /* Use CPR safe protocol */
#define TASKQ_DYNAMIC 0x0004 /* Use dynamic thread
scheduling */
@@ -376,6 +389,7 @@ typedef void (task_func_t)(void *);
#define TQ_NOQUEUE 0x02 /* Do not enqueue if can't
dispatch */
#define TQ_FRONT 0x08 /* Queue in front */
+
extern taskq_t *system_taskq;
extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t);
@@ -384,6 +398,8 @@ extern taskq_t *taskq_create(const char
#define taskq_create_sysdc(a, b, d, e, p, dc, f) \
(taskq_create(a, b, maxclsyspri, d, e, f))
extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
+extern void taskq_dispatch_ent(taskq_t *, task_func_t, void *, uint_t,
+ taskq_ent_t *);
extern void taskq_destroy(taskq_t *);
extern void taskq_wait(taskq_t *);
extern int taskq_member(taskq_t *, void *);
Modified: stable/9/cddl/contrib/opensolaris/lib/libzpool/common/taskq.c
==============================================================================
--- stable/9/cddl/contrib/opensolaris/lib/libzpool/common/taskq.c Thu Jan
16 14:37:50 2014 (r260747)
+++ stable/9/cddl/contrib/opensolaris/lib/libzpool/common/taskq.c Thu Jan
16 14:42:08 2014 (r260748)
@@ -22,19 +22,15 @@
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
+/*
+ * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
+ */
#include <sys/zfs_context.h>
int taskq_now;
taskq_t *system_taskq;
-typedef struct task {
- struct task *task_next;
- struct task *task_prev;
- task_func_t *task_func;
- void *task_arg;
-} task_t;
-
#define TASKQ_ACTIVE 0x00010000
struct taskq {
@@ -51,18 +47,18 @@ struct taskq {
int tq_maxalloc;
kcondvar_t tq_maxalloc_cv;
int tq_maxalloc_wait;
- task_t *tq_freelist;
- task_t tq_task;
+ taskq_ent_t *tq_freelist;
+ taskq_ent_t tq_task;
};
-static task_t *
+static taskq_ent_t *
task_alloc(taskq_t *tq, int tqflags)
{
- task_t *t;
+ taskq_ent_t *t;
int rv;
again: if ((t = tq->tq_freelist) != NULL && tq->tq_nalloc >= tq->tq_minalloc) {
- tq->tq_freelist = t->task_next;
+ tq->tq_freelist = t->tqent_next;
} else {
if (tq->tq_nalloc >= tq->tq_maxalloc) {
if (!(tqflags & KM_SLEEP))
@@ -87,7 +83,7 @@ again: if ((t = tq->tq_freelist) != NULL
}
mutex_exit(&tq->tq_lock);
- t = kmem_alloc(sizeof (task_t), tqflags & KM_SLEEP);
+ t = kmem_alloc(sizeof (taskq_ent_t), tqflags & KM_SLEEP);
mutex_enter(&tq->tq_lock);
if (t != NULL)
@@ -97,15 +93,15 @@ again: if ((t = tq->tq_freelist) != NULL
}
static void
-task_free(taskq_t *tq, task_t *t)
+task_free(taskq_t *tq, taskq_ent_t *t)
{
if (tq->tq_nalloc <= tq->tq_minalloc) {
- t->task_next = tq->tq_freelist;
+ t->tqent_next = tq->tq_freelist;
tq->tq_freelist = t;
} else {
tq->tq_nalloc--;
mutex_exit(&tq->tq_lock);
- kmem_free(t, sizeof (task_t));
+ kmem_free(t, sizeof (taskq_ent_t));
mutex_enter(&tq->tq_lock);
}
@@ -116,7 +112,7 @@ task_free(taskq_t *tq, task_t *t)
taskqid_t
taskq_dispatch(taskq_t *tq, task_func_t func, void *arg, uint_t tqflags)
{
- task_t *t;
+ taskq_ent_t *t;
if (taskq_now) {
func(arg);
@@ -130,26 +126,58 @@ taskq_dispatch(taskq_t *tq, task_func_t
return (0);
}
if (tqflags & TQ_FRONT) {
- t->task_next = tq->tq_task.task_next;
- t->task_prev = &tq->tq_task;
+ t->tqent_next = tq->tq_task.tqent_next;
+ t->tqent_prev = &tq->tq_task;
} else {
- t->task_next = &tq->tq_task;
- t->task_prev = tq->tq_task.task_prev;
+ t->tqent_next = &tq->tq_task;
+ t->tqent_prev = tq->tq_task.tqent_prev;
}
- t->task_next->task_prev = t;
- t->task_prev->task_next = t;
- t->task_func = func;
- t->task_arg = arg;
+ t->tqent_next->tqent_prev = t;
+ t->tqent_prev->tqent_next = t;
+ t->tqent_func = func;
+ t->tqent_arg = arg;
cv_signal(&tq->tq_dispatch_cv);
mutex_exit(&tq->tq_lock);
return (1);
}
void
+taskq_dispatch_ent(taskq_t *tq, task_func_t func, void *arg, uint_t flags,
+ taskq_ent_t *t)
+{
+ ASSERT(func != NULL);
+ ASSERT(!(tq->tq_flags & TASKQ_DYNAMIC));
+
+ /*
+ * Mark it as a prealloc'd task. This is important
+ * to ensure that we don't free it later.
+ */
+ t->tqent_flags |= TQENT_FLAG_PREALLOC;
+ /*
+ * Enqueue the task to the underlying queue.
+ */
+ mutex_enter(&tq->tq_lock);
+
+ if (flags & TQ_FRONT) {
+ t->tqent_next = tq->tq_task.tqent_next;
+ t->tqent_prev = &tq->tq_task;
+ } else {
+ t->tqent_next = &tq->tq_task;
+ t->tqent_prev = tq->tq_task.tqent_prev;
+ }
+ t->tqent_next->tqent_prev = t;
+ t->tqent_prev->tqent_next = t;
+ t->tqent_func = func;
+ t->tqent_arg = arg;
+ cv_signal(&tq->tq_dispatch_cv);
+ mutex_exit(&tq->tq_lock);
+}
+
+void
taskq_wait(taskq_t *tq)
{
mutex_enter(&tq->tq_lock);
- while (tq->tq_task.task_next != &tq->tq_task || tq->tq_active != 0)
+ while (tq->tq_task.tqent_next != &tq->tq_task || tq->tq_active != 0)
cv_wait(&tq->tq_wait_cv, &tq->tq_lock);
mutex_exit(&tq->tq_lock);
}
@@ -158,27 +186,32 @@ static void *
taskq_thread(void *arg)
{
taskq_t *tq = arg;
- task_t *t;
+ taskq_ent_t *t;
+ boolean_t prealloc;
mutex_enter(&tq->tq_lock);
while (tq->tq_flags & TASKQ_ACTIVE) {
- if ((t = tq->tq_task.task_next) == &tq->tq_task) {
+ if ((t = tq->tq_task.tqent_next) == &tq->tq_task) {
if (--tq->tq_active == 0)
cv_broadcast(&tq->tq_wait_cv);
cv_wait(&tq->tq_dispatch_cv, &tq->tq_lock);
tq->tq_active++;
continue;
}
- t->task_prev->task_next = t->task_next;
- t->task_next->task_prev = t->task_prev;
+ t->tqent_prev->tqent_next = t->tqent_next;
+ t->tqent_next->tqent_prev = t->tqent_prev;
+ t->tqent_next = NULL;
+ t->tqent_prev = NULL;
+ prealloc = t->tqent_flags & TQENT_FLAG_PREALLOC;
mutex_exit(&tq->tq_lock);
rw_enter(&tq->tq_threadlock, RW_READER);
- t->task_func(t->task_arg);
+ t->tqent_func(t->tqent_arg);
rw_exit(&tq->tq_threadlock);
mutex_enter(&tq->tq_lock);
- task_free(tq, t);
+ if (!prealloc)
+ task_free(tq, t);
}
tq->tq_nthreads--;
cv_broadcast(&tq->tq_wait_cv);
@@ -217,8 +250,8 @@ taskq_create(const char *name, int nthre
tq->tq_nthreads = nthreads;
tq->tq_minalloc = minalloc;
tq->tq_maxalloc = maxalloc;
- tq->tq_task.task_next = &tq->tq_task;
- tq->tq_task.task_prev = &tq->tq_task;
+ tq->tq_task.tqent_next = &tq->tq_task;
+ tq->tq_task.tqent_prev = &tq->tq_task;
tq->tq_threadlist = kmem_alloc(nthreads * sizeof (thread_t), KM_SLEEP);
if (flags & TASKQ_PREPOPULATE) {
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