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Date: Wed, 14 Jan 2015 16:54:16 +0800
From: Lai Jiangshan <laijs@...fujitsu.com>
To: <linux-kernel@...r.kernel.org>
CC: Lai Jiangshan <laijs@...fujitsu.com>, Tejun Heo <tj@...nel.org>,
Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
"Gu, Zheng" <guz.fnst@...fujitsu.com>,
tangchen <tangchen@...fujitsu.com>,
Hiroyuki KAMEZAWA <kamezawa.hiroyu@...fujitsu.com>
Subject: [RFC PATCH 2/2 shit_A] workqueue: update wq_numa when cpu_present_mask changed
Reported-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: "Gu, Zheng" <guz.fnst@...fujitsu.com>
Cc: tangchen <tangchen@...fujitsu.com>
Cc: Hiroyuki KAMEZAWA <kamezawa.hiroyu@...fujitsu.com>
Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
kernel/workqueue.c | 76 +++++++++++++++++++++++++++++++++++++-----------------
1 file changed, 53 insertions(+), 23 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 19bca3e..5289892 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -266,8 +266,8 @@ struct workqueue_struct {
static struct kmem_cache *pwq_cache;
-static cpumask_var_t *wq_numa_possible_cpumask;
- /* possible CPUs of each node */
+static cpumask_var_t *wq_numa_present_cpumask;
+ /* present CPUs of each node */
static bool wq_disable_numa;
module_param_named(disable_numa, wq_disable_numa, bool, 0444);
@@ -3506,7 +3506,7 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs)
if (wq_numa_enabled) {
for_each_node(node) {
if (cpumask_subset(pool->attrs->cpumask,
- wq_numa_possible_cpumask[node])) {
+ wq_numa_present_cpumask[node])) {
pool->node = node;
break;
}
@@ -3727,8 +3727,8 @@ static bool wq_calc_node_cpumask(const struct workqueue_attrs *attrs, int node,
if (cpumask_empty(cpumask))
goto use_dfl;
- /* yeap, return possible CPUs in @node that @attrs wants */
- cpumask_and(cpumask, attrs->cpumask, wq_numa_possible_cpumask[node]);
+ /* yeap, return present CPUs in @node that @attrs wants */
+ cpumask_and(cpumask, attrs->cpumask, wq_numa_present_cpumask[node]);
return !cpumask_equal(cpumask, attrs->cpumask);
use_dfl:
@@ -3876,8 +3876,8 @@ enomem:
/**
* wq_update_unbound_numa - update NUMA affinity of a wq for CPU hot[un]plug
* @wq: the target workqueue
- * @cpu: the CPU coming up or going down
- * @online: whether @cpu is coming up or going down
+ * @node: the node to be updated
+ * @cpu_off: the CPU going down
*
* This function is to be called from %CPU_DOWN_PREPARE, %CPU_ONLINE and
* %CPU_DOWN_FAILED. @cpu is being hot[un]plugged, update NUMA affinity of
@@ -3895,11 +3895,9 @@ enomem:
* affinity, it's the user's responsibility to flush the work item from
* CPU_DOWN_PREPARE.
*/
-static void wq_update_unbound_numa(struct workqueue_struct *wq, int cpu,
- bool online)
+static void wq_update_unbound_numa(struct workqueue_struct *wq, int node,
+ int cpu_off)
{
- int node = cpu_to_node(cpu);
- int cpu_off = online ? -1 : cpu;
struct pool_workqueue *old_pwq = NULL, *pwq;
struct workqueue_attrs *target_attrs;
cpumask_t *cpumask;
@@ -4565,6 +4563,43 @@ static void restore_unbound_workers_cpumask(struct worker_pool *pool, int cpu)
pool->attrs->cpumask) < 0);
}
+static void wq_numa_notify_cpu_present_set(int cpu, int node)
+{
+ cpumask_set_cpu(cpu, wq_numa_present_cpumask[node]);
+}
+
+static void wq_numa_notify_cpu_present_cleared(int cpu, int node)
+{
+ struct workqueue_struct *wq;
+
+ cpumask_clear_cpu(cpu, wq_numa_present_cpumask[node]);
+
+ list_for_each_entry(wq, &workqueues, list)
+ wq_update_unbound_numa(wq, node, -1);
+}
+
+/*
+ * the memory system code doesn't have notification for cpu_present_mask
+ * changes, we fake one.
+ */
+static void wq_numa_check_present_cpumask_changes(int cpu)
+{
+ int node;
+
+ if (cpumask_test_cpu(cpu, wq_numa_present_cpumask[cpu_to_node(cpu)]))
+ return;
+
+ mutex_lock(&wq_pool_mutex);
+ for_each_node(node) {
+ if (cpumask_test_cpu(cpu, wq_numa_present_cpumask[node])) {
+ wq_numa_notify_cpu_present_cleared(cpu, node);
+ wq_numa_notify_cpu_present_set(cpu, cpu_to_node(cpu));
+ break;
+ }
+ }
+ mutex_unlock(&wq_pool_mutex);
+}
+
/*
* Workqueues should be brought up before normal priority CPU notifiers.
* This will be registered high priority CPU notifier.
@@ -4588,6 +4623,8 @@ static int workqueue_cpu_up_callback(struct notifier_block *nfb,
if (!create_worker(pool))
return NOTIFY_BAD;
}
+
+ wq_numa_check_present_cpumask_changes(cpu);
break;
case CPU_DOWN_FAILED:
@@ -4607,7 +4644,7 @@ static int workqueue_cpu_up_callback(struct notifier_block *nfb,
/* update NUMA affinity of unbound workqueues */
list_for_each_entry(wq, &workqueues, list)
- wq_update_unbound_numa(wq, cpu, true);
+ wq_update_unbound_numa(wq, node, -1);
mutex_unlock(&wq_pool_mutex);
break;
@@ -4636,7 +4673,7 @@ static int workqueue_cpu_down_callback(struct notifier_block *nfb,
/* update NUMA affinity of unbound workqueues */
mutex_lock(&wq_pool_mutex);
list_for_each_entry(wq, &workqueues, list)
- wq_update_unbound_numa(wq, cpu, false);
+ wq_update_unbound_numa(wq, cpu_to_node(cpu), cpu);
mutex_unlock(&wq_pool_mutex);
/* wait for per-cpu unbinding to finish */
@@ -4854,17 +4891,10 @@ static void __init wq_numa_init(void)
BUG_ON(!zalloc_cpumask_var_node(&tbl[node], GFP_KERNEL,
node_online(node) ? node : NUMA_NO_NODE));
- for_each_possible_cpu(cpu) {
- node = cpu_to_node(cpu);
- if (WARN_ON(node == NUMA_NO_NODE)) {
- pr_warn("workqueue: NUMA node mapping not available for cpu%d, disabling NUMA support\n", cpu);
- /* happens iff arch is bonkers, let's just proceed */
- return;
- }
- cpumask_set_cpu(cpu, tbl[node]);
- }
+ for_each_present_cpu(cpu)
+ cpumask_set_cpu(cpu, tbl[cpu_to_node(cpu)]);
- wq_numa_possible_cpumask = tbl;
+ wq_numa_present_cpumask = tbl;
hotplug_memory_notifier(wq_numa_callback, 0);
wq_numa_enabled = true;
}
--
2.1.0
--
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