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workqueue: add workqueue->unbound_attrs 

Currently, when exposing attrs of an unbound workqueue via sysfs, the
workqueue_attrs of first_pwq() is used as that should equal the
current state of the workqueue.

The planned NUMA affinity support will make unbound workqueues make
use of multiple pool_workqueues for different NUMA nodes and the above
assumption will no longer hold.  Introduce workqueue->unbound_attrs
which records the current attrs in effect and use it for sysfs instead
of first_pwq()->attrs.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
This commit is contained in:
Tejun Heo 2013-04-01 11:23:34 -07:00
parent f3f90ad469
commit 6029a91829
1 changed files with 24 additions and 12 deletions
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36
kernel/workqueue.c
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@ -244,6 +244,8 @@ struct workqueue_struct {
int nr_drainers; /* WQ: drain in progress */ int nr_drainers; /* WQ: drain in progress */
int saved_max_active; /* WQ: saved pwq max_active */ int saved_max_active; /* WQ: saved pwq max_active */
struct workqueue_attrs *unbound_attrs; /* WQ: only for unbound wqs */
#ifdef CONFIG_SYSFS #ifdef CONFIG_SYSFS
struct wq_device *wq_dev; /* I: for sysfs interface */ struct wq_device *wq_dev; /* I: for sysfs interface */
#endif #endif
@ -3088,10 +3090,9 @@ static ssize_t wq_nice_show(struct device *dev, struct device_attribute *attr,
struct workqueue_struct *wq = dev_to_wq(dev); struct workqueue_struct *wq = dev_to_wq(dev);
int written; int written;
rcu_read_lock_sched(); mutex_lock(&wq->mutex);
written = scnprintf(buf, PAGE_SIZE, "%d\n", written = scnprintf(buf, PAGE_SIZE, "%d\n", wq->unbound_attrs->nice);
first_pwq(wq)->pool->attrs->nice); mutex_unlock(&wq->mutex);
rcu_read_unlock_sched();
return written; return written;
} }
@ -3105,9 +3106,9 @@ static struct workqueue_attrs *wq_sysfs_prep_attrs(struct workqueue_struct *wq)
if (!attrs) if (!attrs)
return NULL; return NULL;
rcu_read_lock_sched(); mutex_lock(&wq->mutex);
copy_workqueue_attrs(attrs, first_pwq(wq)->pool->attrs); copy_workqueue_attrs(attrs, wq->unbound_attrs);
rcu_read_unlock_sched(); mutex_unlock(&wq->mutex);
return attrs; return attrs;
} }
@ -3138,10 +3139,9 @@ static ssize_t wq_cpumask_show(struct device *dev,
struct workqueue_struct *wq = dev_to_wq(dev); struct workqueue_struct *wq = dev_to_wq(dev);
int written; int written;
rcu_read_lock_sched(); mutex_lock(&wq->mutex);
written = cpumask_scnprintf(buf, PAGE_SIZE, written = cpumask_scnprintf(buf, PAGE_SIZE, wq->unbound_attrs->cpumask);
first_pwq(wq)->pool->attrs->cpumask); mutex_unlock(&wq->mutex);
rcu_read_unlock_sched();
written += scnprintf(buf + written, PAGE_SIZE - written, "\n"); written += scnprintf(buf + written, PAGE_SIZE - written, "\n");
return written; return written;
@ -3558,8 +3558,10 @@ static void pwq_unbound_release_workfn(struct work_struct *work)
* If we're the last pwq going away, @wq is already dead and no one * If we're the last pwq going away, @wq is already dead and no one
* is gonna access it anymore. Free it. * is gonna access it anymore. Free it.
*/ */
if (is_last) if (is_last) {
free_workqueue_attrs(wq->unbound_attrs);
kfree(wq); kfree(wq);
}
} }
/** /**
@ -3634,6 +3636,9 @@ static void init_and_link_pwq(struct pool_workqueue *pwq,
/* link in @pwq */ /* link in @pwq */
list_add_rcu(&pwq->pwqs_node, &wq->pwqs); list_add_rcu(&pwq->pwqs_node, &wq->pwqs);
if (wq->flags & WQ_UNBOUND)
copy_workqueue_attrs(wq->unbound_attrs, pool->attrs);
mutex_unlock(&wq->mutex); mutex_unlock(&wq->mutex);
} }
@ -3766,6 +3771,12 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
if (!wq) if (!wq)
return NULL; return NULL;
if (flags & WQ_UNBOUND) {
wq->unbound_attrs = alloc_workqueue_attrs(GFP_KERNEL);
if (!wq->unbound_attrs)
goto err_free_wq;
}
vsnprintf(wq->name, namelen, fmt, args1); vsnprintf(wq->name, namelen, fmt, args1);
va_end(args); va_end(args);
va_end(args1); va_end(args1);
@ -3835,6 +3846,7 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
return wq; return wq;
err_free_wq: err_free_wq:
free_workqueue_attrs(wq->unbound_attrs);
kfree(wq); kfree(wq);
return NULL; return NULL;
err_destroy: err_destroy: