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Message-Id: <20210928103106.391694-1-imran.f.khan@oracle.com>
Date: Tue, 28 Sep 2021 20:31:06 +1000
From: Imran Khan <imran.f.khan@...cle.com>
To: tj@...nel.org, jiangshanlai@...il.com
Cc: linux-kernel@...r.kernel.org
Subject: [RFC PATCH] workqueue: Introduce __show_worker_pool_state and __show_workqueue_state.
Currently show_workqueue_state shows the state of all workqueues and of
all worker pools.
Divide it into more granular functions (__show_workqueue_state and
__show_worker_pool_state), that would show states of individual workqueues
and worker pools.
Signed-off-by: Imran Khan <imran.f.khan@...cle.com>
---
kernel/workqueue.c | 139 ++++++++++++++++++++++++++-------------------
1 file changed, 79 insertions(+), 60 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 9a042a449002..cfae0c8d5e2e 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4796,6 +4796,81 @@ static void show_pwq(struct pool_workqueue *pwq)
}
}
+/**
+ * __show_workqueue_state - dump state of specified workqueue
+ * @wq: workqueue whose state will be printed
+ */
+static void __show_workqueue_state(struct workqueue_struct *wq)
+{
+ struct pool_workqueue *pwq;
+ bool idle = true;
+ unsigned long flags;
+
+ for_each_pwq(pwq, wq) {
+ if (pwq->nr_active || !list_empty(&pwq->inactive_works)) {
+ idle = false;
+ break;
+ }
+ }
+ if (idle) /* Nothing to print for idle workqueue */
+ return;
+
+ pr_info("workqueue %s: flags=0x%x\n", wq->name, wq->flags);
+
+ for_each_pwq(pwq, wq) {
+ raw_spin_lock_irqsave(&pwq->pool->lock, flags);
+ if (pwq->nr_active || !list_empty(&pwq->inactive_works))
+ show_pwq(pwq);
+ raw_spin_unlock_irqrestore(&pwq->pool->lock, flags);
+ /*
+ * We could be printing a lot from atomic context, e.g.
+ * sysrq-t -> show_workqueue_state(). Avoid triggering
+ * hard lockup.
+ */
+ touch_nmi_watchdog();
+ }
+
+}
+
+/**
+ * __show_worker_pool_state - dump state of specified worker pool
+ * @pool: worker pool whose state will be printed
+ */
+static void __show_worker_pool_state(struct worker_pool *pool)
+{
+ struct worker *worker;
+ bool first = true;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&pool->lock, flags);
+ if (pool->nr_workers == pool->nr_idle)
+ goto next_pool;
+
+ pr_info("pool %d:", pool->id);
+ pr_cont_pool_info(pool);
+ pr_cont(" hung=%us workers=%d",
+ jiffies_to_msecs(jiffies - pool->watchdog_ts) / 1000,
+ pool->nr_workers);
+ if (pool->manager)
+ pr_cont(" manager: %d",
+ task_pid_nr(pool->manager->task));
+ list_for_each_entry(worker, &pool->idle_list, entry) {
+ pr_cont(" %s%d", first ? "idle: " : "",
+ task_pid_nr(worker->task));
+ first = false;
+ }
+ pr_cont("\n");
+next_pool:
+ raw_spin_unlock_irqrestore(&pool->lock, flags);
+ /*
+ * We could be printing a lot from atomic context, e.g.
+ * sysrq-t -> show_workqueue_state(). Avoid triggering
+ * hard lockup.
+ */
+ touch_nmi_watchdog();
+
+}
+
/**
* show_workqueue_state - dump workqueue state
*
@@ -4806,73 +4881,17 @@ void show_workqueue_state(void)
{
struct workqueue_struct *wq;
struct worker_pool *pool;
- unsigned long flags;
int pi;
rcu_read_lock();
pr_info("Showing busy workqueues and worker pools:\n");
- list_for_each_entry_rcu(wq, &workqueues, list) {
- struct pool_workqueue *pwq;
- bool idle = true;
-
- for_each_pwq(pwq, wq) {
- if (pwq->nr_active || !list_empty(&pwq->inactive_works)) {
- idle = false;
- break;
- }
- }
- if (idle)
- continue;
-
- pr_info("workqueue %s: flags=0x%x\n", wq->name, wq->flags);
-
- for_each_pwq(pwq, wq) {
- raw_spin_lock_irqsave(&pwq->pool->lock, flags);
- if (pwq->nr_active || !list_empty(&pwq->inactive_works))
- show_pwq(pwq);
- raw_spin_unlock_irqrestore(&pwq->pool->lock, flags);
- /*
- * We could be printing a lot from atomic context, e.g.
- * sysrq-t -> show_workqueue_state(). Avoid triggering
- * hard lockup.
- */
- touch_nmi_watchdog();
- }
- }
-
- for_each_pool(pool, pi) {
- struct worker *worker;
- bool first = true;
+ list_for_each_entry_rcu(wq, &workqueues, list)
+ __show_workqueue_state(wq);
- raw_spin_lock_irqsave(&pool->lock, flags);
- if (pool->nr_workers == pool->nr_idle)
- goto next_pool;
-
- pr_info("pool %d:", pool->id);
- pr_cont_pool_info(pool);
- pr_cont(" hung=%us workers=%d",
- jiffies_to_msecs(jiffies - pool->watchdog_ts) / 1000,
- pool->nr_workers);
- if (pool->manager)
- pr_cont(" manager: %d",
- task_pid_nr(pool->manager->task));
- list_for_each_entry(worker, &pool->idle_list, entry) {
- pr_cont(" %s%d", first ? "idle: " : "",
- task_pid_nr(worker->task));
- first = false;
- }
- pr_cont("\n");
- next_pool:
- raw_spin_unlock_irqrestore(&pool->lock, flags);
- /*
- * We could be printing a lot from atomic context, e.g.
- * sysrq-t -> show_workqueue_state(). Avoid triggering
- * hard lockup.
- */
- touch_nmi_watchdog();
- }
+ for_each_pool(pool, pi)
+ __show_worker_pool_state(pool);
rcu_read_unlock();
}
base-commit: 64f28502801aad0cb4f97102b4b5a81df315c2aa
--
2.30.2
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