workqueues: Introduce new flag WQ_POWER_EFFICIENT for power oriented workqueues

[thirdparty/linux.git] / kernel / workqueue.c

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4aa9f5bc6b2dfdd9f152f5d20bf06c15f070aa21..8068d97ce141c7138881d8b17fca8f0096de5703 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -272,6 +272,15 @@ static cpumask_var_t *wq_numa_possible_cpumask;
 static bool wq_disable_numa;
 module_param_named(disable_numa, wq_disable_numa, bool, 0444);
 
+/* see the comment above the definition of WQ_POWER_EFFICIENT */
+#ifdef CONFIG_WQ_POWER_EFFICIENT_DEFAULT
+static bool wq_power_efficient = true;
+#else
+static bool wq_power_efficient;
+#endif
+
+module_param_named(power_efficient, wq_power_efficient, bool, 0444);
+
 static bool wq_numa_enabled;           /* unbound NUMA affinity enabled */
 
 /* buf for wq_update_unbound_numa_attrs(), protected by CPU hotplug exclusion */
@@ -4085,6 +4094,10 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
        struct workqueue_struct *wq;
        struct pool_workqueue *pwq;
 
+       /* see the comment above the definition of WQ_POWER_EFFICIENT */
+       if ((flags & WQ_POWER_EFFICIENT) && wq_power_efficient)
+               flags |= WQ_UNBOUND;
+
        /* allocate wq and format name */
        if (flags & WQ_UNBOUND)
                tbl_size = wq_numa_tbl_len * sizeof(wq->numa_pwq_tbl[0]);