ftrace: Correct a text align for event format output

[safe/jmp/linux-2.6] / kernel / workqueue.c

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4952322..e53ee18 100644 (file)
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,6 +33,7 @@
 #include <linux/kallsyms.h>
 #include <linux/debug_locks.h>
 #include <linux/lockdep.h>
+#include <trace/workqueue.h>
 
 /*
  * The per-CPU workqueue (if single thread, we always use the first
@@ -73,7 +74,7 @@ static DEFINE_SPINLOCK(workqueue_lock);
 static LIST_HEAD(workqueues);
 
 static int singlethread_cpu __read_mostly;
-static cpumask_t cpu_singlethread_map __read_mostly;
+static const struct cpumask *cpu_singlethread_map __read_mostly;
 /*
  * _cpu_down() first removes CPU from cpu_online_map, then CPU_DEAD
  * flushes cwq->worklist. This means that flush_workqueue/wait_on_work
@@ -81,7 +82,7 @@ static cpumask_t cpu_singlethread_map __read_mostly;
  * use cpu_possible_map, the cpumask below is more a documentation
  * than optimization.
  */
-static cpumask_t cpu_populated_map __read_mostly;
+static cpumask_var_t cpu_populated_map __read_mostly;
 
 /* If it's single threaded, it isn't in the list of workqueues. */
 static inline int is_wq_single_threaded(struct workqueue_struct *wq)
@@ -89,10 +90,10 @@ static inline int is_wq_single_threaded(struct workqueue_struct *wq)
        return wq->singlethread;
 }
 
-static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
+static const struct cpumask *wq_cpu_map(struct workqueue_struct *wq)
 {
        return is_wq_single_threaded(wq)
-               ? &cpu_singlethread_map : &cpu_populated_map;
+               ? cpu_singlethread_map : cpu_populated_map;
 }
 
 static
@@ -125,9 +126,13 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
        return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
 }
 
+DEFINE_TRACE(workqueue_insertion);
+
 static void insert_work(struct cpu_workqueue_struct *cwq,
                        struct work_struct *work, struct list_head *head)
 {
+       trace_workqueue_insertion(cwq->thread, work);
+
        set_wq_data(work, cwq);
        /*
         * Ensure that we get the right work->data if we see the
@@ -259,6 +264,8 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
 }
 EXPORT_SYMBOL_GPL(queue_delayed_work_on);
 
+DEFINE_TRACE(workqueue_execution);
+
 static void run_workqueue(struct cpu_workqueue_struct *cwq)
 {
        spin_lock_irq(&cwq->lock);
@@ -284,7 +291,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
                 */
                struct lockdep_map lockdep_map = work->lockdep_map;
 #endif
-
+               trace_workqueue_execution(cwq->thread, work);
                cwq->current_work = work;
                list_del_init(cwq->worklist.next);
                spin_unlock_irq(&cwq->lock);
@@ -410,7 +417,7 @@ static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
  */
 void flush_workqueue(struct workqueue_struct *wq)
 {
-       const cpumask_t *cpu_map = wq_cpu_map(wq);
+       const struct cpumask *cpu_map = wq_cpu_map(wq);
        int cpu;
 
        might_sleep();
@@ -532,7 +539,7 @@ static void wait_on_work(struct work_struct *work)
 {
        struct cpu_workqueue_struct *cwq;
        struct workqueue_struct *wq;
-       const cpumask_t *cpu_map;
+       const struct cpumask *cpu_map;
        int cpu;
 
        might_sleep();
@@ -765,6 +772,8 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
        return cwq;
 }
 
+DEFINE_TRACE(workqueue_creation);
+
 static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
 {
        struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
@@ -787,6 +796,8 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
                sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
        cwq->thread = p;
 
+       trace_workqueue_creation(cwq->thread, cpu);
+
        return 0;
 }
 
@@ -868,6 +879,8 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
 }
 EXPORT_SYMBOL_GPL(__create_workqueue_key);
 
+DEFINE_TRACE(workqueue_destruction);
+
 static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
 {
        /*
@@ -891,6 +904,7 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
         * checks list_empty(), and a "normal" queue_work() can't use
         * a dead CPU.
         */
+       trace_workqueue_destruction(cwq->thread);
        kthread_stop(cwq->thread);
        cwq->thread = NULL;
 }
@@ -903,7 +917,7 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
  */
 void destroy_workqueue(struct workqueue_struct *wq)
 {
-       const cpumask_t *cpu_map = wq_cpu_map(wq);
+       const struct cpumask *cpu_map = wq_cpu_map(wq);
        int cpu;
 
        cpu_maps_update_begin();
@@ -933,7 +947,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
 
        switch (action) {
        case CPU_UP_PREPARE:
-               cpu_set(cpu, cpu_populated_map);
+               cpumask_set_cpu(cpu, cpu_populated_map);
        }
 undo:
        list_for_each_entry(wq, &workqueues, list) {
@@ -964,13 +978,15 @@ undo:
        switch (action) {
        case CPU_UP_CANCELED:
        case CPU_POST_DEAD:
-               cpu_clear(cpu, cpu_populated_map);
+               cpumask_clear_cpu(cpu, cpu_populated_map);
        }
 
        return ret;
 }
 
 #ifdef CONFIG_SMP
+static struct workqueue_struct *work_on_cpu_wq __read_mostly;
+
 struct work_for_cpu {
        struct work_struct work;
        long (*fn)(void *);
@@ -991,8 +1007,8 @@ static void do_work_for_cpu(struct work_struct *w)
  * @fn: the function to run
  * @arg: the function arg
  *
- * This will return -EINVAL in the cpu is not online, or the return value
- * of @fn otherwise.
+ * This will return the value @fn returns.
+ * It is up to the caller to ensure that the cpu doesn't go offline.
  */
 long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
 {
@@ -1001,14 +1017,8 @@ long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
        INIT_WORK(&wfc.work, do_work_for_cpu);
        wfc.fn = fn;
        wfc.arg = arg;
-       get_online_cpus();
-       if (unlikely(!cpu_online(cpu)))
-               wfc.ret = -EINVAL;
-       else {
-               schedule_work_on(cpu, &wfc.work);
-               flush_work(&wfc.work);
-       }
-       put_online_cpus();
+       queue_work_on(cpu, work_on_cpu_wq, &wfc.work);
+       flush_work(&wfc.work);
 
        return wfc.ret;
 }
@@ -1017,10 +1027,16 @@ EXPORT_SYMBOL_GPL(work_on_cpu);
 
 void __init init_workqueues(void)
 {
-       cpu_populated_map = cpu_online_map;
-       singlethread_cpu = first_cpu(cpu_possible_map);
-       cpu_singlethread_map = cpumask_of_cpu(singlethread_cpu);
+       alloc_cpumask_var(&cpu_populated_map, GFP_KERNEL);
+
+       cpumask_copy(cpu_populated_map, cpu_online_mask);
+       singlethread_cpu = cpumask_first(cpu_possible_mask);
+       cpu_singlethread_map = cpumask_of(singlethread_cpu);
        hotcpu_notifier(workqueue_cpu_callback, 0);
        keventd_wq = create_workqueue("events");
        BUG_ON(!keventd_wq);
+#ifdef CONFIG_SMP
+       work_on_cpu_wq = create_workqueue("work_on_cpu");
+       BUG_ON(!work_on_cpu_wq);
+#endif
 }