1 files changed, 133 insertions, 64 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 3fc2a575664..dd11c830eb8 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -9,6 +9,7 @@
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/ftrace.h>
+#include <linux/slab.h>
 #include <linux/fs.h>
 
 #include "trace.h"
@@ -39,7 +40,7 @@ struct fgraph_data {
 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
 #define TRACE_GRAPH_PRINT_PROC          0x8
 #define TRACE_GRAPH_PRINT_DURATION      0x10
-#define TRACE_GRAPH_PRINT_ABS_TIME      0X20
+#define TRACE_GRAPH_PRINT_ABS_TIME      0x20
 
 static struct tracer_opt trace_opts[] = {
         /* Display overruns? (for self-debug purpose) */
@@ -178,7 +179,7 @@ unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
         return ret;
 }
 
-static int __trace_graph_entry(struct trace_array *tr,
+int __trace_graph_entry(struct trace_array *tr,
                                 struct ftrace_graph_ent *trace,
                                 unsigned long flags,
                                 int pc)
@@ -237,7 +238,15 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
         return ret;
 }
 
-static void __trace_graph_return(struct trace_array *tr,
+int trace_graph_thresh_entry(struct ftrace_graph_ent *trace)
+{
+        if (tracing_thresh)
+                return 1;
+        else
+                return trace_graph_entry(trace);
+}
+
+void __trace_graph_return(struct trace_array *tr,
                                 struct ftrace_graph_ret *trace,
                                 unsigned long flags,
                                 int pc)
@@ -290,13 +299,26 @@ void set_graph_array(struct trace_array *tr)
         smp_mb();
 }
 
+void trace_graph_thresh_return(struct ftrace_graph_ret *trace)
+{
+        if (tracing_thresh &&
+            (trace->rettime - trace->calltime < tracing_thresh))
+                return;
+        else
+                trace_graph_return(trace);
+}
+
 static int graph_trace_init(struct trace_array *tr)
 {
         int ret;
 
         set_graph_array(tr);
-        ret = register_ftrace_graph(&trace_graph_return,
-                                    &trace_graph_entry);
+        if (tracing_thresh)
+                ret = register_ftrace_graph(&trace_graph_thresh_return,
+                                            &trace_graph_thresh_entry);
+        else
+                ret = register_ftrace_graph(&trace_graph_return,
+                                            &trace_graph_entry);
         if (ret)
                 return ret;
         tracing_start_cmdline_record();
@@ -468,9 +490,10 @@ get_return_for_leaf(struct trace_iterator *iter,
                          * We need to consume the current entry to see
                          * the next one.
                          */
-                        ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
+                        ring_buffer_consume(iter->tr->buffer, iter->cpu,
+                                            NULL, NULL);
                         event = ring_buffer_peek(iter->tr->buffer, iter->cpu,
-                                                 NULL);
+                                                 NULL, NULL);
                 }
 
                 if (!event)
@@ -504,17 +527,18 @@ get_return_for_leaf(struct trace_iterator *iter,
 
 /* Signal a overhead of time execution to the output */
 static int
-print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+print_graph_overhead(unsigned long long duration, struct trace_seq *s,
+                     u32 flags)
 {
         /* If duration disappear, we don't need anything */
-        if (!(tracer_flags.val & TRACE_GRAPH_PRINT_DURATION))
+        if (!(flags & TRACE_GRAPH_PRINT_DURATION))
                 return 1;
 
         /* Non nested entry or return */
         if (duration == -1)
                 return trace_seq_printf(s, "  ");
 
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+        if (flags & TRACE_GRAPH_PRINT_OVERHEAD) {
                 /* Duration exceeded 100 msecs */
                 if (duration > 100000ULL)
                         return trace_seq_printf(s, "! ");
@@ -540,7 +564,7 @@ static int print_graph_abs_time(u64 t, struct trace_seq *s)
 
 static enum print_line_t
 print_graph_irq(struct trace_iterator *iter, unsigned long addr,
-                enum trace_type type, int cpu, pid_t pid)
+                enum trace_type type, int cpu, pid_t pid, u32 flags)
 {
         int ret;
         struct trace_seq *s = &iter->seq;
@@ -550,21 +574,21 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
                 return TRACE_TYPE_UNHANDLED;
 
         /* Absolute time */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+        if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
                 ret = print_graph_abs_time(iter->ts, s);
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
         /* Cpu */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+        if (flags & TRACE_GRAPH_PRINT_CPU) {
                 ret = print_graph_cpu(s, cpu);
                 if (ret == TRACE_TYPE_PARTIAL_LINE)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
         /* Proc */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+        if (flags & TRACE_GRAPH_PRINT_PROC) {
                 ret = print_graph_proc(s, pid);
                 if (ret == TRACE_TYPE_PARTIAL_LINE)
                         return TRACE_TYPE_PARTIAL_LINE;
@@ -574,7 +598,7 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
         }
 
         /* No overhead */
-        ret = print_graph_overhead(-1, s);
+        ret = print_graph_overhead(-1, s, flags);
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
@@ -587,7 +611,7 @@ print_graph_irq(struct trace_iterator *iter, unsigned long addr,
                 return TRACE_TYPE_PARTIAL_LINE;
 
         /* Don't close the duration column if haven't one */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+        if (flags & TRACE_GRAPH_PRINT_DURATION)
                 trace_seq_printf(s, " |");
         ret = trace_seq_printf(s, "\n");
 
@@ -657,7 +681,8 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
 static enum print_line_t
 print_graph_entry_leaf(struct trace_iterator *iter,
                 struct ftrace_graph_ent_entry *entry,
-                struct ftrace_graph_ret_entry *ret_entry, struct trace_seq *s)
+                struct ftrace_graph_ret_entry *ret_entry,
+                struct trace_seq *s, u32 flags)
 {
         struct fgraph_data *data = iter->private;
         struct ftrace_graph_ret *graph_ret;
@@ -689,12 +714,12 @@ print_graph_entry_leaf(struct trace_iterator *iter,
         }
 
         /* Overhead */
-        ret = print_graph_overhead(duration, s);
+        ret = print_graph_overhead(duration, s, flags);
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
         /* Duration */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+        if (flags & TRACE_GRAPH_PRINT_DURATION) {
                 ret = print_graph_duration(duration, s);
                 if (ret == TRACE_TYPE_PARTIAL_LINE)
                         return TRACE_TYPE_PARTIAL_LINE;
@@ -717,7 +742,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
 static enum print_line_t
 print_graph_entry_nested(struct trace_iterator *iter,
                          struct ftrace_graph_ent_entry *entry,
-                         struct trace_seq *s, int cpu)
+                         struct trace_seq *s, int cpu, u32 flags)
 {
         struct ftrace_graph_ent *call = &entry->graph_ent;
         struct fgraph_data *data = iter->private;
@@ -737,12 +762,12 @@ print_graph_entry_nested(struct trace_iterator *iter,
         }
 
         /* No overhead */
-        ret = print_graph_overhead(-1, s);
+        ret = print_graph_overhead(-1, s, flags);
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
         /* No time */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+        if (flags & TRACE_GRAPH_PRINT_DURATION) {
                 ret = trace_seq_printf(s, "            |  ");
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
@@ -768,7 +793,7 @@ print_graph_entry_nested(struct trace_iterator *iter,
 
 static enum print_line_t
 print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
-                     int type, unsigned long addr)
+                     int type, unsigned long addr, u32 flags)
 {
         struct fgraph_data *data = iter->private;
         struct trace_entry *ent = iter->ent;
@@ -781,27 +806,27 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
 
         if (type) {
                 /* Interrupt */
-                ret = print_graph_irq(iter, addr, type, cpu, ent->pid);
+                ret = print_graph_irq(iter, addr, type, cpu, ent->pid, flags);
                 if (ret == TRACE_TYPE_PARTIAL_LINE)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
         /* Absolute time */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+        if (flags & TRACE_GRAPH_PRINT_ABS_TIME) {
                 ret = print_graph_abs_time(iter->ts, s);
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
         /* Cpu */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+        if (flags & TRACE_GRAPH_PRINT_CPU) {
                 ret = print_graph_cpu(s, cpu);
                 if (ret == TRACE_TYPE_PARTIAL_LINE)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
         /* Proc */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+        if (flags & TRACE_GRAPH_PRINT_PROC) {
                 ret = print_graph_proc(s, ent->pid);
                 if (ret == TRACE_TYPE_PARTIAL_LINE)
                         return TRACE_TYPE_PARTIAL_LINE;
@@ -823,7 +848,7 @@ print_graph_prologue(struct trace_iterator *iter, struct trace_seq *s,
 
 static enum print_line_t
 print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
-                        struct trace_iterator *iter)
+                        struct trace_iterator *iter, u32 flags)
 {
         struct fgraph_data *data = iter->private;
         struct ftrace_graph_ent *call = &field->graph_ent;
@@ -831,14 +856,14 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
         static enum print_line_t ret;
         int cpu = iter->cpu;
 
-        if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func))
+        if (print_graph_prologue(iter, s, TRACE_GRAPH_ENT, call->func, flags))
                 return TRACE_TYPE_PARTIAL_LINE;
 
         leaf_ret = get_return_for_leaf(iter, field);
         if (leaf_ret)
-                ret = print_graph_entry_leaf(iter, field, leaf_ret, s);
+                ret = print_graph_entry_leaf(iter, field, leaf_ret, s, flags);
         else
-                ret = print_graph_entry_nested(iter, field, s, cpu);
+                ret = print_graph_entry_nested(iter, field, s, cpu, flags);
 
         if (data) {
                 /*
@@ -857,7 +882,8 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
 
 static enum print_line_t
 print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
-                   struct trace_entry *ent, struct trace_iterator *iter)
+                   struct trace_entry *ent, struct trace_iterator *iter,
+                   u32 flags)
 {
         unsigned long long duration = trace->rettime - trace->calltime;
         struct fgraph_data *data = iter->private;
@@ -887,16 +913,16 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
                 }
         }
 
-        if (print_graph_prologue(iter, s, 0, 0))
+        if (print_graph_prologue(iter, s, 0, 0, flags))
                 return TRACE_TYPE_PARTIAL_LINE;
 
         /* Overhead */
-        ret = print_graph_overhead(duration, s);
+        ret = print_graph_overhead(duration, s, flags);
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
         /* Duration */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+        if (flags & TRACE_GRAPH_PRINT_DURATION) {
                 ret = print_graph_duration(duration, s);
                 if (ret == TRACE_TYPE_PARTIAL_LINE)
                         return TRACE_TYPE_PARTIAL_LINE;
@@ -920,20 +946,21 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         } else {
-                ret = trace_seq_printf(s, "} (%ps)\n", (void *)trace->func);
+                ret = trace_seq_printf(s, "} /* %ps */\n", (void *)trace->func);
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
         /* Overrun */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERRUN) {
+        if (flags & TRACE_GRAPH_PRINT_OVERRUN) {
                 ret = trace_seq_printf(s, " (Overruns: %lu)\n",
                                         trace->overrun);
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
-        ret = print_graph_irq(iter, trace->func, TRACE_GRAPH_RET, cpu, pid);
+        ret = print_graph_irq(iter, trace->func, TRACE_GRAPH_RET,
+                              cpu, pid, flags);
         if (ret == TRACE_TYPE_PARTIAL_LINE)
                 return TRACE_TYPE_PARTIAL_LINE;
 
@@ -941,8 +968,8 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
 }
 
 static enum print_line_t
-print_graph_comment(struct trace_seq *s,  struct trace_entry *ent,
-                    struct trace_iterator *iter)
+print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
+                    struct trace_iterator *iter, u32 flags)
 {
         unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
         struct fgraph_data *data = iter->private;
@@ -954,16 +981,16 @@ print_graph_comment(struct trace_seq *s,  struct trace_entry *ent,
         if (data)
                 depth = per_cpu_ptr(data->cpu_data, iter->cpu)->depth;
 
-        if (print_graph_prologue(iter, s, 0, 0))
+        if (print_graph_prologue(iter, s, 0, 0, flags))
                 return TRACE_TYPE_PARTIAL_LINE;
 
         /* No overhead */
-        ret = print_graph_overhead(-1, s);
+        ret = print_graph_overhead(-1, s, flags);
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
         /* No time */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+        if (flags & TRACE_GRAPH_PRINT_DURATION) {
                 ret = trace_seq_printf(s, "            |  ");
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
@@ -1018,7 +1045,7 @@ print_graph_comment(struct trace_seq *s,  struct trace_entry *ent,
 
 
 enum print_line_t
-print_graph_function(struct trace_iterator *iter)
+print_graph_function_flags(struct trace_iterator *iter, u32 flags)
 {
         struct ftrace_graph_ent_entry *field;
         struct fgraph_data *data = iter->private;
@@ -1039,7 +1066,7 @@ print_graph_function(struct trace_iterator *iter)
         if (data && data->failed) {
                 field = &data->ent;
                 iter->cpu = data->cpu;
-                ret = print_graph_entry(field, s, iter);
+                ret = print_graph_entry(field, s, iter, flags);
                 if (ret == TRACE_TYPE_HANDLED && iter->cpu != cpu) {
                         per_cpu_ptr(data->cpu_data, iter->cpu)->ignore = 1;
                         ret = TRACE_TYPE_NO_CONSUME;
@@ -1059,32 +1086,49 @@ print_graph_function(struct trace_iterator *iter)
                 struct ftrace_graph_ent_entry saved;
                 trace_assign_type(field, entry);
                 saved = *field;
-                return print_graph_entry(&saved, s, iter);
+                return print_graph_entry(&saved, s, iter, flags);
         }
         case TRACE_GRAPH_RET: {
                 struct ftrace_graph_ret_entry *field;
                 trace_assign_type(field, entry);
-                return print_graph_return(&field->ret, s, entry, iter);
+                return print_graph_return(&field->ret, s, entry, iter, flags);
         }
+        case TRACE_STACK:
+        case TRACE_FN:
+                /* dont trace stack and functions as comments */
+                return TRACE_TYPE_UNHANDLED;
+
         default:
-                return print_graph_comment(s, entry, iter);
+                return print_graph_comment(s, entry, iter, flags);
         }
 
         return TRACE_TYPE_HANDLED;
 }
 
-static void print_lat_header(struct seq_file *s)
+static enum print_line_t
+print_graph_function(struct trace_iterator *iter)
+{
+        return print_graph_function_flags(iter, tracer_flags.val);
+}
+
+static enum print_line_t
+print_graph_function_event(struct trace_iterator *iter, int flags)
+{
+        return print_graph_function(iter);
+}
+
+static void print_lat_header(struct seq_file *s, u32 flags)
 {
         static const char spaces[] = "                " /* 16 spaces */
                 "    "                                  /* 4 spaces */
                 "                 ";                    /* 17 spaces */
         int size = 0;
 
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+        if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
                 size += 16;
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
+        if (flags & TRACE_GRAPH_PRINT_CPU)
                 size += 4;
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
+        if (flags & TRACE_GRAPH_PRINT_PROC)
                 size += 17;
 
         seq_printf(s, "#%.*s  _-----=> irqs-off        \n", size, spaces);
@@ -1095,43 +1139,48 @@ static void print_lat_header(struct seq_file *s)
         seq_printf(s, "#%.*s|||| /                     \n", size, spaces);
 }
 
-static void print_graph_headers(struct seq_file *s)
+void print_graph_headers_flags(struct seq_file *s, u32 flags)
 {
         int lat = trace_flags & TRACE_ITER_LATENCY_FMT;
 
         if (lat)
-                print_lat_header(s);
+                print_lat_header(s, flags);
 
         /* 1st line */
         seq_printf(s, "#");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+        if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
                 seq_printf(s, "     TIME       ");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
+        if (flags & TRACE_GRAPH_PRINT_CPU)
                 seq_printf(s, " CPU");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
+        if (flags & TRACE_GRAPH_PRINT_PROC)
                 seq_printf(s, "  TASK/PID       ");
         if (lat)
                 seq_printf(s, "|||||");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+        if (flags & TRACE_GRAPH_PRINT_DURATION)
                 seq_printf(s, "  DURATION   ");
         seq_printf(s, "               FUNCTION CALLS\n");
 
         /* 2nd line */
         seq_printf(s, "#");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+        if (flags & TRACE_GRAPH_PRINT_ABS_TIME)
                 seq_printf(s, "      |         ");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
+        if (flags & TRACE_GRAPH_PRINT_CPU)
                 seq_printf(s, " |  ");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
+        if (flags & TRACE_GRAPH_PRINT_PROC)
                 seq_printf(s, "   |    |        ");
         if (lat)
                 seq_printf(s, "|||||");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+        if (flags & TRACE_GRAPH_PRINT_DURATION)
                 seq_printf(s, "   |   |      ");
         seq_printf(s, "               |   |   |   |\n");
 }
 
-static void graph_trace_open(struct trace_iterator *iter)
+void print_graph_headers(struct seq_file *s)
+{
+        print_graph_headers_flags(s, tracer_flags.val);
+}
+
+void graph_trace_open(struct trace_iterator *iter)
 {
         /* pid and depth on the last trace processed */
         struct fgraph_data *data;
@@ -1166,7 +1215,7 @@ static void graph_trace_open(struct trace_iterator *iter)
         pr_warning("function graph tracer: not enough memory\n");
 }
 
-static void graph_trace_close(struct trace_iterator *iter)
+void graph_trace_close(struct trace_iterator *iter)
 {
         struct fgraph_data *data = iter->private;
 
@@ -1176,6 +1225,16 @@ static void graph_trace_close(struct trace_iterator *iter)
         }
 }
 
+static struct trace_event graph_trace_entry_event = {
+        .type           = TRACE_GRAPH_ENT,
+        .trace          = print_graph_function_event,
+};
+
+static struct trace_event graph_trace_ret_event = {
+        .type           = TRACE_GRAPH_RET,
+        .trace          = print_graph_function_event,
+};
+
 static struct tracer graph_trace __read_mostly = {
         .name           = "function_graph",
         .open           = graph_trace_open,
@@ -1197,6 +1256,16 @@ static __init int init_graph_trace(void)
 {
         max_bytes_for_cpu = snprintf(NULL, 0, "%d", nr_cpu_ids - 1);
 
+        if (!register_ftrace_event(&graph_trace_entry_event)) {
+                pr_warning("Warning: could not register graph trace events\n");
+                return 1;
+        }
+
+        if (!register_ftrace_event(&graph_trace_ret_event)) {
+                pr_warning("Warning: could not register graph trace events\n");
+                return 1;
+        }
+
         return register_tracer(&graph_trace);
 }