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Date: Wed, 20 Mar 2013 23:52:03 +0800
From: Lai Jiangshan <eag0628@...il.com>
To: Tejun Heo <tj@...nel.org>
Cc: laijs@...fujitsu.com, axboe@...nel.dk, jack@...e.cz,
fengguang.wu@...el.com, jmoyer@...hat.com, zab@...hat.com,
linux-kernel@...r.kernel.org, herbert@...dor.apana.org.au,
davem@...emloft.net, linux-crypto@...r.kernel.org
Subject: Re: [PATCH 08/10] workqueue: break init_and_link_pwq() into two
functions and introduce alloc_unbound_pwq()
On Wed, Mar 20, 2013 at 8:00 AM, Tejun Heo <tj@...nel.org> wrote:
> Break init_and_link_pwq() into init_pwq() and link_pwq() and move
> unbound-workqueue specific handling into apply_workqueue_attrs().
> Also, factor out unbound pool and pool_workqueue allocation into
> alloc_unbound_pwq().
>
> This reorganization is to prepare for NUMA affinity and doesn't
> introduce any functional changes.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---
> kernel/workqueue.c | 75 +++++++++++++++++++++++++++++++++++++-----------------
> 1 file changed, 52 insertions(+), 23 deletions(-)
>
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 3f820a5..bbbfc92 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -3647,13 +3647,10 @@ static void pwq_adjust_max_active(struct pool_workqueue *pwq)
> spin_unlock(&pwq->pool->lock);
> }
>
> -static void init_and_link_pwq(struct pool_workqueue *pwq,
> - struct workqueue_struct *wq,
> - struct worker_pool *pool,
> - struct pool_workqueue **p_last_pwq)
> +/* initialize newly zalloced @pwq which is associated with @wq and @pool */
> +static void init_pwq(struct pool_workqueue *pwq, struct workqueue_struct *wq,
> + struct worker_pool *pool)
> {
> - int node;
> -
> BUG_ON((unsigned long)pwq & WORK_STRUCT_FLAG_MASK);
>
> pwq->pool = pool;
> @@ -3663,9 +3660,16 @@ static void init_and_link_pwq(struct pool_workqueue *pwq,
> INIT_LIST_HEAD(&pwq->delayed_works);
> INIT_LIST_HEAD(&pwq->mayday_node);
> INIT_WORK(&pwq->unbound_release_work, pwq_unbound_release_workfn);
> +}
>
> - mutex_lock(&wq->flush_mutex);
> - spin_lock_irq(&pwq_lock);
> +/* sync @pwq with the current state of its associated wq and link it */
> +static void link_pwq(struct pool_workqueue *pwq,
> + struct pool_workqueue **p_last_pwq)
> +{
> + struct workqueue_struct *wq = pwq->wq;
> +
> + lockdep_assert_held(&wq->flush_mutex);
> + lockdep_assert_held(&pwq_lock);
>
> /*
> * Set the matching work_color. This is synchronized with
> @@ -3680,15 +3684,27 @@ static void init_and_link_pwq(struct pool_workqueue *pwq,
>
> /* link in @pwq */
> list_add_rcu(&pwq->pwqs_node, &wq->pwqs);
> +}
>
> - if (wq->flags & WQ_UNBOUND) {
> - copy_workqueue_attrs(wq->unbound_attrs, pool->attrs);
> - for_each_node(node)
> - rcu_assign_pointer(wq->numa_pwq_tbl[node], pwq);
> +/* obtain a pool matching @attr and create a pwq associating the pool and @wq */
> +static struct pool_workqueue *alloc_unbound_pwq(struct workqueue_struct *wq,
> + const struct workqueue_attrs *attrs)
> +{
> + struct worker_pool *pool;
> + struct pool_workqueue *pwq;
> +
> + pool = get_unbound_pool(attrs);
> + if (!pool)
> + return NULL;
> +
> + pwq = kmem_cache_zalloc(pwq_cache, GFP_KERNEL);
this allocation is not numa-awared, you may use pool->node here.
> + if (!pwq) {
> + put_unbound_pool(pool);
> + return NULL;
> }
>
> - spin_unlock_irq(&pwq_lock);
> - mutex_unlock(&wq->flush_mutex);
> + init_pwq(pwq, wq, pool);
> + return pwq;
> }
>
> /**
> @@ -3709,7 +3725,7 @@ int apply_workqueue_attrs(struct workqueue_struct *wq,
> const struct workqueue_attrs *attrs)
> {
> struct pool_workqueue *pwq, *last_pwq;
> - struct worker_pool *pool;
> + int node;
>
> /* only unbound workqueues can change attributes */
> if (WARN_ON(!(wq->flags & WQ_UNBOUND)))
> @@ -3719,17 +3735,22 @@ int apply_workqueue_attrs(struct workqueue_struct *wq,
> if (WARN_ON((wq->flags & __WQ_ORDERED) && !list_empty(&wq->pwqs)))
> return -EINVAL;
>
> - pwq = kmem_cache_zalloc(pwq_cache, GFP_KERNEL);
> + pwq = alloc_unbound_pwq(wq, attrs);
> if (!pwq)
> return -ENOMEM;
>
> - pool = get_unbound_pool(attrs);
> - if (!pool) {
> - kmem_cache_free(pwq_cache, pwq);
> - return -ENOMEM;
> - }
> + mutex_lock(&wq->flush_mutex);
> + spin_lock_irq(&pwq_lock);
> +
> + link_pwq(pwq, &last_pwq);
> +
> + copy_workqueue_attrs(wq->unbound_attrs, pwq->pool->attrs);
> + for_each_node(node)
> + rcu_assign_pointer(wq->numa_pwq_tbl[node], pwq);
> +
> + spin_unlock_irq(&pwq_lock);
> + mutex_unlock(&wq->flush_mutex);
>
> - init_and_link_pwq(pwq, wq, pool, &last_pwq);
> if (last_pwq) {
> spin_lock_irq(&last_pwq->pool->lock);
> put_pwq(last_pwq);
> @@ -3755,7 +3776,15 @@ static int alloc_and_link_pwqs(struct workqueue_struct *wq)
> struct worker_pool *cpu_pools =
> per_cpu(cpu_worker_pools, cpu);
>
> - init_and_link_pwq(pwq, wq, &cpu_pools[highpri], NULL);
> + init_pwq(pwq, wq, &cpu_pools[highpri]);
> +
> + mutex_lock(&wq->flush_mutex);
> + spin_lock_irq(&pwq_lock);
> +
> + link_pwq(pwq, NULL);
> +
> + spin_unlock_irq(&pwq_lock);
> + mutex_unlock(&wq->flush_mutex);
> }
> return 0;
> } else {
> --
> 1.8.1.4
>
> --
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