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Subject[PATCH 2/2] Markers Implementation for Preempt RCU Boost Tracing - Ver II
This patch converts the tracing mechanism of Preempt RCU boosting into
markers. The handler functions for these markers are included inside
rcupreempt_trace.c and will be included only when PREEMPT_RCU_BOOST is
chosen.

Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
---
include/linux/rcupreempt_trace.h | 40 +++++++
kernel/rcupreempt-boost.c | 211 ++++-----------------------------------
kernel/rcupreempt_trace.c | 183 +++++++++++++++++++++++++++++++++
3 files changed, 245 insertions(+), 189 deletions(-)
Index: linux-2.6.24-rc5-rt1.RCU_MARKERS/include/linux/rcupreempt_trace.h
===================================================================
--- linux-2.6.24-rc5-rt1.RCU_MARKERS.orig/include/linux/rcupreempt_trace.h
+++ linux-2.6.24-rc5-rt1.RCU_MARKERS/include/linux/rcupreempt_trace.h
@@ -95,5 +95,45 @@ extern int rcupreempt_flip_flag(int cpu)
extern int rcupreempt_mb_flag(int cpu);
extern char *rcupreempt_try_flip_state_name(void);

+#ifdef CONFIG_PREEMPT_RCU_BOOST
+struct preempt_rcu_boost_trace {
+ unsigned long rbs_stat_task_boost_called;
+ unsigned long rbs_stat_task_boosted;
+ unsigned long rbs_stat_boost_called;
+ unsigned long rbs_stat_try_boost;
+ unsigned long rbs_stat_boosted;
+ unsigned long rbs_stat_unboost_called;
+ unsigned long rbs_stat_unboosted;
+ unsigned long rbs_stat_try_boost_readers;
+ unsigned long rbs_stat_boost_readers;
+ unsigned long rbs_stat_try_unboost_readers;
+ unsigned long rbs_stat_unboost_readers;
+ unsigned long rbs_stat_over_taken;
+};
+
+#define DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(preempt_rcu_boost_var) \
+void preempt_rcu_boost_var##_callback(const struct marker *mdata, \
+ void *private_data, const char *format, ...) \
+{ \
+ struct preempt_rcu_boost_trace *boost_trace; \
+ boost_trace = (&per_cpu(boost_trace_data, smp_processor_id())); \
+ boost_trace->rbs_stat_##preempt_rcu_boost_var++; \
+}
+
+struct preempt_rcu_boost_probe {
+ const char *name;
+ const char *format;
+ marker_probe_func *probe_func;
+};
+
+#define INIT_PREEMPT_RCU_BOOST_PROBE(preempt_rcu_boost_probe_worker) \
+{ \
+ .name = __stringify(preempt_rcu_boost_probe_worker), \
+ .probe_func = preempt_rcu_boost_probe_worker##_callback \
+}
+
+extern int read_rcu_boost_prio(void);
+#endif /* CONFIG_PREEMPT_RCU_BOOST */
+
#endif /* __KERNEL__ */
#endif /* __LINUX_RCUPREEMPT_TRACE_H */
Index: linux-2.6.24-rc5-rt1.RCU_MARKERS/kernel/rcupreempt_trace.c
===================================================================
--- linux-2.6.24-rc5-rt1.RCU_MARKERS.orig/kernel/rcupreempt_trace.c
+++ linux-2.6.24-rc5-rt1.RCU_MARKERS/kernel/rcupreempt_trace.c
@@ -51,6 +51,163 @@ static char *rcupreempt_trace_buf;

static DEFINE_PER_CPU(struct rcupreempt_trace, trace_data);

+#ifdef CONFIG_PREEMPT_RCU_BOOST
+#define RCUPREEMPT_BOOST_TRACE_BUF_SIZE 4096
+static char rcupreempt_boost_trace_buf[RCUPREEMPT_BOOST_TRACE_BUF_SIZE];
+static DEFINE_PER_CPU(struct preempt_rcu_boost_trace, boost_trace_data);
+
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(task_boost_called);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(task_boosted);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(boost_called);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(try_boost);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(boosted);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(unboost_called);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(unboosted);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(try_boost_readers);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(boost_readers);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(try_unboost_readers);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(unboost_readers);
+DEFINE_PREEMPT_RCU_BOOST_MARKER_HANDLER(over_taken);
+
+static struct preempt_rcu_boost_probe preempt_rcu_boost_probe_array[] =
+{
+ INIT_PREEMPT_RCU_BOOST_PROBE(task_boost_called),
+ INIT_PREEMPT_RCU_BOOST_PROBE(task_boosted),
+ INIT_PREEMPT_RCU_BOOST_PROBE(boost_called),
+ INIT_PREEMPT_RCU_BOOST_PROBE(try_boost),
+ INIT_PREEMPT_RCU_BOOST_PROBE(boosted),
+ INIT_PREEMPT_RCU_BOOST_PROBE(unboost_called),
+ INIT_PREEMPT_RCU_BOOST_PROBE(unboosted),
+ INIT_PREEMPT_RCU_BOOST_PROBE(try_boost_readers),
+ INIT_PREEMPT_RCU_BOOST_PROBE(boost_readers),
+ INIT_PREEMPT_RCU_BOOST_PROBE(try_unboost_readers),
+ INIT_PREEMPT_RCU_BOOST_PROBE(unboost_readers),
+ INIT_PREEMPT_RCU_BOOST_PROBE(over_taken)
+};
+
+static ssize_t rcuboost_read(struct file *filp, char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ static DEFINE_MUTEX(mutex);
+ int cnt = 0;
+ int cpu;
+ struct preempt_rcu_boost_trace *prbt;
+ ssize_t bcount;
+ unsigned long task_boost_called = 0;
+ unsigned long task_boosted = 0;
+ unsigned long boost_called = 0;
+ unsigned long try_boost = 0;
+ unsigned long boosted = 0;
+ unsigned long unboost_called = 0;
+ unsigned long unboosted = 0;
+ unsigned long try_boost_readers = 0;
+ unsigned long boost_readers = 0;
+ unsigned long try_unboost_readers = 0;
+ unsigned long unboost_readers = 0;
+ unsigned long over_taken = 0;
+
+ mutex_lock(&mutex);
+
+ for_each_online_cpu(cpu) {
+ prbt = &per_cpu(boost_trace_data, cpu);
+
+ task_boost_called += prbt->rbs_stat_task_boost_called;
+ task_boosted += prbt->rbs_stat_task_boosted;
+ boost_called += prbt->rbs_stat_boost_called;
+ try_boost += prbt->rbs_stat_try_boost;
+ boosted += prbt->rbs_stat_boosted;
+ unboost_called += prbt->rbs_stat_unboost_called;
+ unboosted += prbt->rbs_stat_unboosted;
+ try_boost_readers += prbt->rbs_stat_try_boost_readers;
+ boost_readers += prbt->rbs_stat_boost_readers;
+ try_unboost_readers += prbt->rbs_stat_try_boost_readers;
+ unboost_readers += prbt->rbs_stat_boost_readers;
+ over_taken += prbt->rbs_stat_over_taken;
+ }
+
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "task_boost_called = %ld\n",
+ task_boost_called);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "task_boosted = %ld\n",
+ task_boosted);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "boost_called = %ld\n",
+ boost_called);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "try_boost = %ld\n",
+ try_boost);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "boosted = %ld\n",
+ boosted);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "unboost_called = %ld\n",
+ unboost_called);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "unboosted = %ld\n",
+ unboosted);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "try_boost_readers = %ld\n",
+ try_boost_readers);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "boost_readers = %ld\n",
+ boost_readers);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "try_unboost_readers = %ld\n",
+ try_unboost_readers);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "unboost_readers = %ld\n",
+ unboost_readers);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "over_taken = %ld\n",
+ over_taken);
+ cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
+ RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
+ "rcu_boost_prio = %d\n",
+ read_rcu_boost_prio());
+ bcount = simple_read_from_buffer(buffer, count, ppos,
+ rcupreempt_boost_trace_buf, strlen(rcupreempt_boost_trace_buf));
+ mutex_unlock(&mutex);
+
+ return bcount;
+}
+
+static struct file_operations rcuboost_fops = {
+ .read = rcuboost_read,
+};
+
+static struct dentry *rcuboostdir;
+int rcu_trace_boost_create(struct dentry *rcudir)
+{
+ rcuboostdir = debugfs_create_file("rcuboost", 0444, rcudir,
+ NULL, &rcuboost_fops);
+ if (!rcuboostdir)
+ return 0;
+
+ return 1;
+}
+
+void rcu_trace_boost_destroy(void)
+{
+ if (rcuboostdir)
+ debugfs_remove(rcuboostdir);
+ rcuboostdir = NULL;
+}
+
+#endif /* CONFIG_PREEMPT_RCU_BOOST */
+
struct rcupreempt_trace *rcupreempt_trace_cpu(int cpu)
{
return &per_cpu(trace_data, cpu);
@@ -350,6 +507,10 @@ static int rcupreempt_debugfs_init(void)
if (!ctrsdir)
goto free_out;

+#ifdef CONFIG_PREEMPT_RCU_BOOST
+ if (!rcu_trace_boost_create(rcudir))
+ goto free_out;
+#endif /* CONFIG_PREEMPT_RCU_BOOST */
return 0;
free_out:
if (ctrsdir)
@@ -382,6 +543,22 @@ static int __init rcupreempt_trace_init(
}
printk(KERN_INFO "RCU Preempt markers registered\n");

+#ifdef CONFIG_PREEMPT_RCU_BOOST
+ for (i = 0; i < ARRAY_SIZE(preempt_rcu_boost_probe_array); i++) {
+ struct preempt_rcu_boost_probe *p = \
+ &preempt_rcu_boost_probe_array[i];
+ ret = marker_probe_register(p->name, p->format,
+ p->probe_func, p);
+ if (ret)
+ printk(KERN_INFO "Unable to register Preempt RCU Boost \
+ probe %s\n", preempt_rcu_boost_probe_array[i].name);
+ ret = marker_arm(p->name);
+ if (ret)
+ printk(KERN_INFO "Unable to arm Preempt RCU Boost \
+ markers %s\n", p->name);
+}
+#endif /* CONFIG_PREEMPT_RCU_BOOST */
+
mutex_init(&rcupreempt_trace_mutex);
rcupreempt_trace_buf = kmalloc(RCUPREEMPT_TRACE_BUF_SIZE, GFP_KERNEL);
if (!rcupreempt_trace_buf)
@@ -400,6 +577,12 @@ static void __exit rcupreempt_trace_clea
marker_probe_unregister(rcupreempt_probe_array[i].name);
printk(KERN_INFO "RCU Preempt markers unregistered\n");

+#ifdef CONFIG_PREEMPT_RCU_BOOST
+ rcu_trace_boost_destroy();
+ for (i = 0; i < ARRAY_SIZE(preempt_rcu_boost_probe_array); i++)
+ marker_probe_unregister(preempt_rcu_boost_probe_array[i].name);
+ printk(KERN_INFO "Preempt RCU Boost markers unregistered\n");
+#endif /* CONFIG_PREEMPT_RCU_BOOST */
debugfs_remove(statdir);
debugfs_remove(gpdir);
debugfs_remove(ctrsdir);
Index: linux-2.6.24-rc5-rt1.RCU_MARKERS/kernel/rcupreempt-boost.c
===================================================================
--- linux-2.6.24-rc5-rt1.RCU_MARKERS.orig/kernel/rcupreempt-boost.c
+++ linux-2.6.24-rc5-rt1.RCU_MARKERS/kernel/rcupreempt-boost.c
@@ -40,186 +40,9 @@ struct rcu_boost_dat {
int rbs_prio; /* CPU copy of rcu_boost_prio */
struct list_head rbs_toboost; /* Preempted RCU readers */
struct list_head rbs_boosted; /* RCU readers that have been boosted */
-#ifdef CONFIG_RCU_TRACE
- /* The rest are for statistics */
- unsigned long rbs_stat_task_boost_called;
- unsigned long rbs_stat_task_boosted;
- unsigned long rbs_stat_boost_called;
- unsigned long rbs_stat_try_boost;
- unsigned long rbs_stat_boosted;
- unsigned long rbs_stat_unboost_called;
- unsigned long rbs_stat_unboosted;
- unsigned long rbs_stat_try_boost_readers;
- unsigned long rbs_stat_boost_readers;
- unsigned long rbs_stat_try_unboost_readers;
- unsigned long rbs_stat_unboost_readers;
- unsigned long rbs_stat_over_taken;
-#endif /* CONFIG_RCU_TRACE */
};

static DEFINE_PER_CPU(struct rcu_boost_dat, rcu_boost_data);
-#define RCU_BOOST_ME &__get_cpu_var(rcu_boost_data)
-
-#ifdef CONFIG_RCU_TRACE
-
-#define RCUPREEMPT_BOOST_TRACE_BUF_SIZE 4096
-static char rcupreempt_boost_trace_buf[RCUPREEMPT_BOOST_TRACE_BUF_SIZE];
-
-static ssize_t rcuboost_read(struct file *filp, char __user *buffer,
- size_t count, loff_t *ppos)
-{
- static DEFINE_MUTEX(mutex);
- int cnt = 0;
- int cpu;
- struct rcu_boost_dat *rbd;
- ssize_t bcount;
- unsigned long task_boost_called = 0;
- unsigned long task_boosted = 0;
- unsigned long boost_called = 0;
- unsigned long try_boost = 0;
- unsigned long boosted = 0;
- unsigned long unboost_called = 0;
- unsigned long unboosted = 0;
- unsigned long try_boost_readers = 0;
- unsigned long boost_readers = 0;
- unsigned long try_unboost_readers = 0;
- unsigned long unboost_readers = 0;
- unsigned long over_taken = 0;
-
- mutex_lock(&mutex);
-
- for_each_online_cpu(cpu) {
- rbd = &per_cpu(rcu_boost_data, cpu);
-
- task_boost_called += rbd->rbs_stat_task_boost_called;
- task_boosted += rbd->rbs_stat_task_boosted;
- boost_called += rbd->rbs_stat_boost_called;
- try_boost += rbd->rbs_stat_try_boost;
- boosted += rbd->rbs_stat_boosted;
- unboost_called += rbd->rbs_stat_unboost_called;
- unboosted += rbd->rbs_stat_unboosted;
- try_boost_readers += rbd->rbs_stat_try_boost_readers;
- boost_readers += rbd->rbs_stat_boost_readers;
- try_unboost_readers += rbd->rbs_stat_try_boost_readers;
- unboost_readers += rbd->rbs_stat_boost_readers;
- over_taken += rbd->rbs_stat_over_taken;
- }
-
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "task_boost_called = %ld\n",
- task_boost_called);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "task_boosted = %ld\n",
- task_boosted);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "boost_called = %ld\n",
- boost_called);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "try_boost = %ld\n",
- try_boost);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "boosted = %ld\n",
- boosted);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "unboost_called = %ld\n",
- unboost_called);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "unboosted = %ld\n",
- unboosted);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "try_boost_readers = %ld\n",
- try_boost_readers);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "boost_readers = %ld\n",
- boost_readers);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "try_unboost_readers = %ld\n",
- try_unboost_readers);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "unboost_readers = %ld\n",
- unboost_readers);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "over_taken = %ld\n",
- over_taken);
- cnt += snprintf(&rcupreempt_boost_trace_buf[cnt],
- RCUPREEMPT_BOOST_TRACE_BUF_SIZE - cnt,
- "rcu_boost_prio = %d\n",
- rcu_boost_prio);
- bcount = simple_read_from_buffer(buffer, count, ppos,
- rcupreempt_boost_trace_buf, strlen(rcupreempt_boost_trace_buf));
- mutex_unlock(&mutex);
-
- return bcount;
-}
-
-static struct file_operations rcuboost_fops = {
- .read = rcuboost_read,
-};
-
-static struct dentry *rcuboostdir;
-int rcu_trace_boost_create(struct dentry *rcudir)
-{
- rcuboostdir = debugfs_create_file("rcuboost", 0444, rcudir,
- NULL, &rcuboost_fops);
- if (!rcuboostdir)
- return 0;
-
- return 1;
-}
-EXPORT_SYMBOL_GPL(rcu_trace_boost_create);
-
-void rcu_trace_boost_destroy(void)
-{
- if (rcuboostdir)
- debugfs_remove(rcuboostdir);
- rcuboostdir = NULL;
-}
-EXPORT_SYMBOL_GPL(rcu_trace_boost_destroy);
-
-#define RCU_BOOST_TRACE_FUNC_DECL(type) \
- static void rcu_trace_boost_##type(struct rcu_boost_dat *rbd) \
- { \
- rbd->rbs_stat_##type++; \
- }
-RCU_BOOST_TRACE_FUNC_DECL(task_boost_called)
-RCU_BOOST_TRACE_FUNC_DECL(task_boosted)
-RCU_BOOST_TRACE_FUNC_DECL(boost_called)
-RCU_BOOST_TRACE_FUNC_DECL(try_boost)
-RCU_BOOST_TRACE_FUNC_DECL(boosted)
-RCU_BOOST_TRACE_FUNC_DECL(unboost_called)
-RCU_BOOST_TRACE_FUNC_DECL(unboosted)
-RCU_BOOST_TRACE_FUNC_DECL(try_boost_readers)
-RCU_BOOST_TRACE_FUNC_DECL(boost_readers)
-RCU_BOOST_TRACE_FUNC_DECL(try_unboost_readers)
-RCU_BOOST_TRACE_FUNC_DECL(unboost_readers)
-RCU_BOOST_TRACE_FUNC_DECL(over_taken)
-#else /* CONFIG_RCU_TRACE */
-/* These were created by the above macro "RCU_BOOST_TRACE_FUNC_DECL" */
-# define rcu_trace_boost_task_boost_called(rbd) do { } while (0)
-# define rcu_trace_boost_task_boosted(rbd) do { } while (0)
-# define rcu_trace_boost_boost_called(rbd) do { } while (0)
-# define rcu_trace_boost_try_boost(rbd) do { } while (0)
-# define rcu_trace_boost_boosted(rbd) do { } while (0)
-# define rcu_trace_boost_unboost_called(rbd) do { } while (0)
-# define rcu_trace_boost_unboosted(rbd) do { } while (0)
-# define rcu_trace_boost_try_boost_readers(rbd) do { } while (0)
-# define rcu_trace_boost_boost_readers(rbd) do { } while (0)
-# define rcu_trace_boost_try_unboost_readers(rbd) do { } while (0)
-# define rcu_trace_boost_unboost_readers(rbd) do { } while (0)
-# define rcu_trace_boost_over_taken(rbd) do { } while (0)
-#endif /* CONFIG_RCU_TRACE */

static inline int rcu_is_boosted(struct task_struct *task)
{
@@ -234,10 +57,10 @@ static void rcu_boost_task(struct task_s
WARN_ON(!irqs_disabled());
WARN_ON_SMP(!spin_is_locked(&task->pi_lock));

- rcu_trace_boost_task_boost_called(RCU_BOOST_ME);
+ trace_mark(task_boost_called, "NULL");

if (task->rcu_prio < task->prio) {
- rcu_trace_boost_task_boosted(RCU_BOOST_ME);
+ trace_mark(task_boosted, "NULL");
task_setprio(task, task->rcu_prio);
}
}
@@ -261,7 +84,7 @@ void __rcu_preempt_boost(void)

WARN_ON(!current->rcu_read_lock_nesting);

- rcu_trace_boost_boost_called(RCU_BOOST_ME);
+ trace_mark(boost_called, "NULL");

/* check to see if we are already boosted */
if (unlikely(rcu_is_boosted(curr)))
@@ -279,7 +102,7 @@ void __rcu_preempt_boost(void)

curr->rcub_rbdp = rbd;

- rcu_trace_boost_try_boost(rbd);
+ trace_mark(try_boost, "NULL");

prio = rt_mutex_getprio(curr);

@@ -288,7 +111,7 @@ void __rcu_preempt_boost(void)
if (prio <= rbd->rbs_prio)
goto out;

- rcu_trace_boost_boosted(curr->rcub_rbdp);
+ trace_mark(boosted, "NULL");

curr->rcu_prio = rbd->rbs_prio;
rcu_boost_task(curr);
@@ -313,7 +136,7 @@ void __rcu_preempt_unboost(void)
int prio;
unsigned long flags;

- rcu_trace_boost_unboost_called(RCU_BOOST_ME);
+ trace_mark(unboost_called, "NULL");

/* if not boosted, then ignore */
if (likely(!rcu_is_boosted(curr)))
@@ -351,7 +174,7 @@ void __rcu_preempt_unboost(void)

list_del_init(&curr->rcub_entry);

- rcu_trace_boost_unboosted(rbd);
+ trace_mark(unboosted, "NULL");

curr->rcu_prio = MAX_PRIO;

@@ -412,7 +235,7 @@ static int __rcu_boost_readers(struct rc
* Another task may have taken over.
*/
if (curr->rcu_preempt_counter != rcu_boost_counter) {
- rcu_trace_boost_over_taken(rbd);
+ trace_mark(over_taken, "NULL");
return 1;
}

@@ -443,7 +266,7 @@ void rcu_boost_readers(void)

prio = rt_mutex_getprio(curr);

- rcu_trace_boost_try_boost_readers(RCU_BOOST_ME);
+ trace_mark(try_boost_readers, "NULL");

if (prio >= rcu_boost_prio) {
/* already boosted */
@@ -453,7 +276,7 @@ void rcu_boost_readers(void)

rcu_boost_prio = prio;

- rcu_trace_boost_boost_readers(RCU_BOOST_ME);
+ trace_mark(boost_readers, "NULL");

/* Flag that we are the one to unboost */
curr->rcu_preempt_counter = ++rcu_boost_counter;
@@ -486,12 +309,12 @@ void rcu_unboost_readers(void)

spin_lock_irqsave(&rcu_boost_wake_lock, flags);

- rcu_trace_boost_try_unboost_readers(RCU_BOOST_ME);
+ trace_mark(try_unboost_readers, "NULL");

if (current->rcu_preempt_counter != rcu_boost_counter)
goto out;

- rcu_trace_boost_unboost_readers(RCU_BOOST_ME);
+ trace_mark(unboost_readers, "NULL");

/*
* We could also put in something that
@@ -514,6 +337,16 @@ void rcu_unboost_readers(void)
}

/*
+ * This function exports the rcu_boost_prio variable for use by
+ * modules that need it e.g. RCU_TRACE module
+ */
+int read_rcu_boost_prio(void)
+{
+ return rcu_boost_prio;
+}
+EXPORT_SYMBOL_GPL(read_rcu_boost_prio);
+
+/*
* The krcupreemptd wakes up every "rcu_preempt_thread_secs"
* seconds at the minimum priority of 1 to do a
* synchronize_rcu. This ensures that grace periods finish

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