Differential D7393 Diff 18977 sys/kern/subr_taskqueue.c

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sys/kern/subr_taskqueue.c

Show First 20 Lines • Show All 255 Lines • ▼ Show 20 Lines	taskqueue_enqueue_locked(struct taskqueue queue, struct task task)
if ((queue->tq_flags & TQ_FLAGS_UNLOCKED_ENQUEUE) == 0)		if ((queue->tq_flags & TQ_FLAGS_UNLOCKED_ENQUEUE) == 0)
TQ_UNLOCK(queue);		TQ_UNLOCK(queue);

/* Return with lock released. */		/* Return with lock released. */
return (0);		return (0);
}		}

int		int
grouptaskqueue_enqueue(struct taskqueue queue, struct task task)
{
TQ_LOCK(queue);
if (task->ta_pending) {
TQ_UNLOCK(queue);
return (0);
}
STAILQ_INSERT_TAIL(&queue->tq_queue, task, ta_link);
task->ta_pending = 1;
TQ_UNLOCK(queue);
if ((queue->tq_flags & TQ_FLAGS_BLOCKED) == 0)
queue->tq_enqueue(queue->tq_context);
return (0);
}

int
taskqueue_enqueue(struct taskqueue queue, struct task task)		taskqueue_enqueue(struct taskqueue queue, struct task task)
{		{
int res;		int res;

TQ_LOCK(queue);		TQ_LOCK(queue);
res = taskqueue_enqueue_locked(queue, task);		res = taskqueue_enqueue_locked(queue, task);
/* The lock is released inside. */		/* The lock is released inside. */

▲ Show 20 Lines • Show All 512 Lines • ▼ Show 20 Lines	for (i = 0, j = 0; ; i++) {
if (queue->tq_threads[i] == td) {		if (queue->tq_threads[i] == td) {
ret = 1;		ret = 1;
break;		break;
}		}
if (++j >= queue->tq_tcount)		if (++j >= queue->tq_tcount)
break;		break;
}		}
return (ret);		return (ret);
}

struct taskqgroup_cpu {
LIST_HEAD(, grouptask) tgc_tasks;
struct taskqueue *tgc_taskq;
int tgc_cnt;
int tgc_cpu;
};

struct taskqgroup {
struct taskqgroup_cpu tqg_queue[MAXCPU];
struct mtx tqg_lock;
char * tqg_name;
int tqg_adjusting;
int tqg_stride;
int tqg_cnt;
};

struct taskq_bind_task {
struct task bt_task;
int bt_cpuid;
};

static void
taskqgroup_cpu_create(struct taskqgroup *qgroup, int idx)
{
struct taskqgroup_cpu *qcpu;
int i, j;

qcpu = &qgroup->tqg_queue[idx];
LIST_INIT(&qcpu->tgc_tasks);
qcpu->tgc_taskq = taskqueue_create_fast(NULL, M_WAITOK,
taskqueue_thread_enqueue, &qcpu->tgc_taskq);
taskqueue_start_threads(&qcpu->tgc_taskq, 1, PI_SOFT,
"%s_%d", qgroup->tqg_name, idx);

for (i = CPU_FIRST(), j = 0; j < idx * qgroup->tqg_stride;
j++, i = CPU_NEXT(i)) {
/*
* Wait: evaluate the idx * qgroup->tqg_stride'th CPU,
* potentially wrapping the actual count
*/
}
qcpu->tgc_cpu = i;
}

static void
taskqgroup_cpu_remove(struct taskqgroup *qgroup, int idx)
{

taskqueue_free(qgroup->tqg_queue[idx].tgc_taskq);
}

/*
* Find the taskq with least # of tasks that doesn't currently have any
* other queues from the uniq identifier.
*/
static int
taskqgroup_find(struct taskqgroup qgroup, void uniq)
{
struct grouptask *n;
int i, idx, mincnt;
int strict;

mtx_assert(&qgroup->tqg_lock, MA_OWNED);
if (qgroup->tqg_cnt == 0)
return (0);
idx = -1;
mincnt = INT_MAX;
/*
* Two passes; First scan for a queue with the least tasks that
* does not already service this uniq id. If that fails simply find
* the queue with the least total tasks;
*/
for (strict = 1; mincnt == INT_MAX; strict = 0) {
for (i = 0; i < qgroup->tqg_cnt; i++) {
if (qgroup->tqg_queue[i].tgc_cnt > mincnt)
continue;
if (strict) {
LIST_FOREACH(n,
&qgroup->tqg_queue[i].tgc_tasks, gt_list)
if (n->gt_uniq == uniq)
break;
if (n != NULL)
continue;
}
mincnt = qgroup->tqg_queue[i].tgc_cnt;
idx = i;
}
}
if (idx == -1)
panic("taskqgroup_find: Failed to pick a qid.");

return (idx);
}

void
taskqgroup_attach(struct taskqgroup qgroup, struct grouptask gtask,
void uniq, int irq, char name)
{
cpuset_t mask;
int qid;

gtask->gt_uniq = uniq;
gtask->gt_name = name;
gtask->gt_irq = irq;
gtask->gt_cpu = -1;
mtx_lock(&qgroup->tqg_lock);
qid = taskqgroup_find(qgroup, uniq);
qgroup->tqg_queue[qid].tgc_cnt++;
LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
if (irq != -1 && smp_started) {
CPU_ZERO(&mask);
CPU_SET(qgroup->tqg_queue[qid].tgc_cpu, &mask);
mtx_unlock(&qgroup->tqg_lock);
intr_setaffinity(irq, &mask);
} else
mtx_unlock(&qgroup->tqg_lock);
}

int
taskqgroup_attach_cpu(struct taskqgroup qgroup, struct grouptask gtask,
void uniq, int cpu, int irq, char name)
{
cpuset_t mask;
int i, qid;

qid = -1;
gtask->gt_uniq = uniq;
gtask->gt_name = name;
gtask->gt_irq = irq;
gtask->gt_cpu = cpu;
mtx_lock(&qgroup->tqg_lock);
if (smp_started) {
for (i = 0; i < qgroup->tqg_cnt; i++)
if (qgroup->tqg_queue[i].tgc_cpu == cpu) {
qid = i;
break;
}
if (qid == -1) {
mtx_unlock(&qgroup->tqg_lock);
return (EINVAL);
}
} else
qid = 0;
qgroup->tqg_queue[qid].tgc_cnt++;
LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask, gt_list);
gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
if (irq != -1 && smp_started) {
CPU_ZERO(&mask);
CPU_SET(qgroup->tqg_queue[qid].tgc_cpu, &mask);
mtx_unlock(&qgroup->tqg_lock);
intr_setaffinity(irq, &mask);
} else
mtx_unlock(&qgroup->tqg_lock);
return (0);
}

void
taskqgroup_detach(struct taskqgroup qgroup, struct grouptask gtask)
{
int i;

mtx_lock(&qgroup->tqg_lock);
for (i = 0; i < qgroup->tqg_cnt; i++)
if (qgroup->tqg_queue[i].tgc_taskq == gtask->gt_taskqueue)
break;
if (i == qgroup->tqg_cnt)
panic("taskqgroup_detach: task not in group\n");
qgroup->tqg_queue[i].tgc_cnt--;
LIST_REMOVE(gtask, gt_list);
mtx_unlock(&qgroup->tqg_lock);
gtask->gt_taskqueue = NULL;
}

static void
taskqgroup_binder(void *ctx, int pending)
{
struct taskq_bind_task task = (struct taskq_bind_task )ctx;
cpuset_t mask;
int error;

CPU_ZERO(&mask);
CPU_SET(task->bt_cpuid, &mask);
error = cpuset_setthread(curthread->td_tid, &mask);
thread_lock(curthread);
sched_bind(curthread, task->bt_cpuid);
thread_unlock(curthread);

if (error)
printf("taskqgroup_binder: setaffinity failed: %d\n",
error);
free(task, M_DEVBUF);
}

static void
taskqgroup_bind(struct taskqgroup *qgroup)
{
struct taskq_bind_task *task;
int i;

/*
* Bind taskqueue threads to specific CPUs, if they have been assigned
* one.
*/
for (i = 0; i < qgroup->tqg_cnt; i++) {
task = malloc(sizeof (*task), M_DEVBUF, M_NOWAIT);
TASK_INIT(&task->bt_task, 0, taskqgroup_binder, task);
task->bt_cpuid = qgroup->tqg_queue[i].tgc_cpu;
taskqueue_enqueue(qgroup->tqg_queue[i].tgc_taskq,
&task->bt_task);
}
}

static int
_taskqgroup_adjust(struct taskqgroup *qgroup, int cnt, int stride)
{
LIST_HEAD(, grouptask) gtask_head = LIST_HEAD_INITIALIZER(NULL);
cpuset_t mask;
struct grouptask *gtask;
int i, k, old_cnt, qid, cpu;

mtx_assert(&qgroup->tqg_lock, MA_OWNED);

if (cnt < 1 \|\| cnt * stride > mp_ncpus \|\| !smp_started) {
printf("taskqgroup_adjust failed cnt: %d stride: %d "
"mp_ncpus: %d smp_started: %d\n", cnt, stride, mp_ncpus,
smp_started);
return (EINVAL);
}
if (qgroup->tqg_adjusting) {
printf("taskqgroup_adjust failed: adjusting\n");
return (EBUSY);
}
qgroup->tqg_adjusting = 1;
old_cnt = qgroup->tqg_cnt;
mtx_unlock(&qgroup->tqg_lock);
/*
* Set up queue for tasks added before boot.
*/
if (old_cnt == 0) {
LIST_SWAP(&gtask_head, &qgroup->tqg_queue[0].tgc_tasks,
grouptask, gt_list);
qgroup->tqg_queue[0].tgc_cnt = 0;
}

/*
* If new taskq threads have been added.
*/
for (i = old_cnt; i < cnt; i++)
taskqgroup_cpu_create(qgroup, i);
mtx_lock(&qgroup->tqg_lock);
qgroup->tqg_cnt = cnt;
qgroup->tqg_stride = stride;

/*
* Adjust drivers to use new taskqs.
*/
for (i = 0; i < old_cnt; i++) {
while ((gtask = LIST_FIRST(&qgroup->tqg_queue[i].tgc_tasks))) {
LIST_REMOVE(gtask, gt_list);
qgroup->tqg_queue[i].tgc_cnt--;
LIST_INSERT_HEAD(&gtask_head, gtask, gt_list);
}
}

while ((gtask = LIST_FIRST(&gtask_head))) {
LIST_REMOVE(gtask, gt_list);
if (gtask->gt_cpu == -1)
qid = taskqgroup_find(qgroup, gtask->gt_uniq);
else {
for (i = 0; i < qgroup->tqg_cnt; i++)
if (qgroup->tqg_queue[i].tgc_cpu == gtask->gt_cpu) {
qid = i;
break;
}
}
qgroup->tqg_queue[qid].tgc_cnt++;
LIST_INSERT_HEAD(&qgroup->tqg_queue[qid].tgc_tasks, gtask,
gt_list);
gtask->gt_taskqueue = qgroup->tqg_queue[qid].tgc_taskq;
}
/*
* Set new CPU and IRQ affinity
*/
cpu = CPU_FIRST();
for (i = 0; i < cnt; i++) {
qgroup->tqg_queue[i].tgc_cpu = cpu;
for (k = 0; k < qgroup->tqg_stride; k++)
cpu = CPU_NEXT(cpu);
CPU_ZERO(&mask);
CPU_SET(qgroup->tqg_queue[i].tgc_cpu, &mask);
LIST_FOREACH(gtask, &qgroup->tqg_queue[i].tgc_tasks, gt_list) {
if (gtask->gt_irq == -1)
continue;
intr_setaffinity(gtask->gt_irq, &mask);
}
}
mtx_unlock(&qgroup->tqg_lock);

/*
* If taskq thread count has been reduced.
*/
for (i = cnt; i < old_cnt; i++)
taskqgroup_cpu_remove(qgroup, i);

mtx_lock(&qgroup->tqg_lock);
qgroup->tqg_adjusting = 0;

taskqgroup_bind(qgroup);

return (0);
}

int
taskqgroup_adjust(struct taskqgroup *qgroup, int cpu, int stride)
{
int error;

mtx_lock(&qgroup->tqg_lock);
error = _taskqgroup_adjust(qgroup, cpu, stride);
mtx_unlock(&qgroup->tqg_lock);

return (error);
}

struct taskqgroup *
taskqgroup_create(char *name)
{
struct taskqgroup *qgroup;

qgroup = malloc(sizeof(*qgroup), M_TASKQUEUE, M_WAITOK \| M_ZERO);
mtx_init(&qgroup->tqg_lock, "taskqgroup", NULL, MTX_DEF);
qgroup->tqg_name = name;
LIST_INIT(&qgroup->tqg_queue[0].tgc_tasks);

return (qgroup);
}

void
taskqgroup_destroy(struct taskqgroup *qgroup)
{

}		}