Merge branch 'tip/perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/core

7 files changed, 68 insertions, 13 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 900b409543db..b1e8943fed1d 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -152,7 +152,6 @@ void clear_ftrace_function(void)
         ftrace_pid_function = ftrace_stub;
 }
 
-#undef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
 #ifndef CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST
 /*
  * For those archs that do not test ftrace_trace_stop in their
@@ -1212,7 +1211,9 @@ ftrace_hash_move(struct ftrace_ops *ops, int enable,
         if (!src->count) {
                 free_ftrace_hash_rcu(*dst);
                 rcu_assign_pointer(*dst, EMPTY_HASH);
-                return 0;
+                /* still need to update the function records */
+                ret = 0;
+                goto out;
         }
 
         /*
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f2bd275bb60f..9e158cc84ced 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2140,6 +2140,21 @@ enum print_line_t print_trace_line(struct trace_iterator *iter)
         return print_trace_fmt(iter);
 }
 
+void trace_latency_header(struct seq_file *m)
+{
+        struct trace_iterator *iter = m->private;
+
+        /* print nothing if the buffers are empty */
+        if (trace_empty(iter))
+                return;
+
+        if (iter->iter_flags & TRACE_FILE_LAT_FMT)
+                print_trace_header(m, iter);
+
+        if (!(trace_flags & TRACE_ITER_VERBOSE))
+                print_lat_help_header(m);
+}
+
 void trace_default_header(struct seq_file *m)
 {
         struct trace_iterator *iter = m->private;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 092e1f8d18dc..f8ec2291b522 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -370,6 +370,7 @@ void trace_graph_function(struct trace_array *tr,
                     unsigned long ip,
                     unsigned long parent_ip,
                     unsigned long flags, int pc);
+void trace_latency_header(struct seq_file *m);
 void trace_default_header(struct seq_file *m);
 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
 int trace_empty(struct trace_iterator *iter);
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 581876f9f387..c212a7f934ec 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1078,7 +1078,6 @@ event_subsystem_dir(const char *name, struct dentry *d_events)
         /* First see if we did not already create this dir */
         list_for_each_entry(system, &event_subsystems, list) {
                 if (strcmp(system->name, name) == 0) {
-                        __get_system(system);
                         system->nr_events++;
                         return system->entry;
                 }
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 816d3d074979..fdc6d22d406b 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -27,6 +27,12 @@
 #include "trace.h"
 #include "trace_output.h"
 
+#define DEFAULT_SYS_FILTER_MESSAGE                                      \
+        "### global filter ###\n"                                       \
+        "# Use this to set filters for multiple events.\n"              \
+        "# Only events with the given fields will be affected.\n"       \
+        "# If no events are modified, an error message will be displayed here"
+
 enum filter_op_ids
 {
         OP_OR,
@@ -646,7 +652,7 @@ void print_subsystem_event_filter(struct event_subsystem *system,
         if (filter && filter->filter_string)
                 trace_seq_printf(s, "%s\n", filter->filter_string);
         else
-                trace_seq_printf(s, "none\n");
+                trace_seq_printf(s, DEFAULT_SYS_FILTER_MESSAGE "\n");
         mutex_unlock(&event_mutex);
 }
 
@@ -1649,7 +1655,9 @@ static int replace_system_preds(struct event_subsystem *system,
                  */
                 err = replace_preds(call, NULL, ps, filter_string, true);
                 if (err)
-                        goto fail;
+                        call->flags |= TRACE_EVENT_FL_NO_SET_FILTER;
+                else
+                        call->flags &= ~TRACE_EVENT_FL_NO_SET_FILTER;
         }
 
         list_for_each_entry(call, &ftrace_events, list) {
@@ -1658,6 +1666,9 @@ static int replace_system_preds(struct event_subsystem *system,
                 if (strcmp(call->class->system, system->name) != 0)
                         continue;
 
+                if (call->flags & TRACE_EVENT_FL_NO_SET_FILTER)
+                        continue;
+
                 filter_item = kzalloc(sizeof(*filter_item), GFP_KERNEL);
                 if (!filter_item)
                         goto fail_mem;
@@ -1833,7 +1844,10 @@ int apply_subsystem_event_filter(struct event_subsystem *system,
         if (!filter)
                 goto out;
 
-        replace_filter_string(filter, filter_string);
+        /* System filters just show a default message */
+        kfree(filter->filter_string);
+        filter->filter_string = NULL;
+
         /*
          * No event actually uses the system filter
          * we can free it without synchronize_sched().
@@ -1843,14 +1857,12 @@ int apply_subsystem_event_filter(struct event_subsystem *system,
 
         parse_init(ps, filter_ops, filter_string);
         err = filter_parse(ps);
-        if (err) {
-                append_filter_err(ps, system->filter);
-                goto out;
-        }
+        if (err)
+                goto err_filter;
 
         err = replace_system_preds(system, ps, filter_string);
         if (err)
-                append_filter_err(ps, system->filter);
+                goto err_filter;
 
 out:
         filter_opstack_clear(ps);
@@ -1860,6 +1872,11 @@ out_unlock:
         mutex_unlock(&event_mutex);
 
         return err;
+
+err_filter:
+        replace_filter_string(filter, filter_string);
+        append_filter_err(ps, system->filter);
+        goto out;
 }
 
 #ifdef CONFIG_PERF_EVENTS
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 20dad0d7a163..99d20e920368 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -280,9 +280,20 @@ static enum print_line_t irqsoff_print_line(struct trace_iterator *iter)
 }
 
 static void irqsoff_graph_return(struct ftrace_graph_ret *trace) { }
-static void irqsoff_print_header(struct seq_file *s) { }
 static void irqsoff_trace_open(struct trace_iterator *iter) { }
 static void irqsoff_trace_close(struct trace_iterator *iter) { }
+
+#ifdef CONFIG_FUNCTION_TRACER
+static void irqsoff_print_header(struct seq_file *s)
+{
+        trace_default_header(s);
+}
+#else
+static void irqsoff_print_header(struct seq_file *s)
+{
+        trace_latency_header(s);
+}
+#endif /* CONFIG_FUNCTION_TRACER */
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
 /*
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index e4a70c0c71b6..ff791ea48b57 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -280,9 +280,20 @@ static enum print_line_t wakeup_print_line(struct trace_iterator *iter)
 }
 
 static void wakeup_graph_return(struct ftrace_graph_ret *trace) { }
-static void wakeup_print_header(struct seq_file *s) { }
 static void wakeup_trace_open(struct trace_iterator *iter) { }
 static void wakeup_trace_close(struct trace_iterator *iter) { }
+
+#ifdef CONFIG_FUNCTION_TRACER
+static void wakeup_print_header(struct seq_file *s)
+{
+        trace_default_header(s);
+}
+#else
+static void wakeup_print_header(struct seq_file *s)
+{
+        trace_latency_header(s);
+}
+#endif /* CONFIG_FUNCTION_TRACER */
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 
 /*