Merge branches 'tracing/ftrace' and 'tracing/function-graph-tracer' into tracing/core

1 files changed, 195 insertions, 103 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 3c545984816f..66fc7b806a38 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1,7 +1,7 @@
 /*
  *
  * Function graph tracer.
- * Copyright (c) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ * Copyright (c) 2008-2009 Frederic Weisbecker <fweisbec@gmail.com>
  * Mostly borrowed from function tracer which
  * is Copyright (c) Steven Rostedt <srostedt@redhat.com>
  *
@@ -21,9 +21,11 @@
 #define TRACE_GRAPH_PRINT_CPU           0x2
 #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
 
 static struct tracer_opt trace_opts[] = {
-        /* Display overruns ? */
+        /* Display overruns? (for self-debug purpose) */
         { TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
         /* Display CPU ? */
         { TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
@@ -31,17 +33,22 @@ static struct tracer_opt trace_opts[] = {
         { TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
         /* Display proc name/pid */
         { TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
+        /* Display duration of execution */
+        { TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) },
+        /* Display absolute time of an entry */
+        { TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
         { } /* Empty entry */
 };
 
 static struct tracer_flags tracer_flags = {
         /* Don't display overruns and proc by default */
-        .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD,
+        .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
+               TRACE_GRAPH_PRINT_DURATION,
         .opts = trace_opts
 };
 
 /* pid on the last trace processed */
-static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
+
 
 static int graph_trace_init(struct trace_array *tr)
 {
@@ -154,17 +161,25 @@ print_graph_proc(struct trace_seq *s, pid_t pid)
 
 /* If the pid changed since the last trace, output this event */
 static enum print_line_t
-verif_pid(struct trace_seq *s, pid_t pid, int cpu)
+verif_pid(struct trace_seq *s, pid_t pid, int cpu, pid_t *last_pids_cpu)
 {
         pid_t prev_pid;
+        pid_t *last_pid;
         int ret;
 
-        if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
+        if (!last_pids_cpu)
+                return TRACE_TYPE_HANDLED;
+
+        last_pid = per_cpu_ptr(last_pids_cpu, cpu);
+
+        if (*last_pid == pid)
                 return TRACE_TYPE_HANDLED;
 
-        prev_pid = last_pid[cpu];
-        last_pid[cpu] = pid;
+        prev_pid = *last_pid;
+        *last_pid = pid;
 
+        if (prev_pid == -1)
+                return TRACE_TYPE_HANDLED;
 /*
  * Context-switch trace line:
 
@@ -232,9 +247,34 @@ trace_branch_is_leaf(struct trace_iterator *iter,
         return true;
 }
 
+/* Signal a overhead of time execution to the output */
+static int
+print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+{
+        /* If duration disappear, we don't need anything */
+        if (!(tracer_flags.val & 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) {
+                /* Duration exceeded 100 msecs */
+                if (duration > 100000ULL)
+                        return trace_seq_printf(s, "! ");
+
+                /* Duration exceeded 10 msecs */
+                if (duration > 10000ULL)
+                        return trace_seq_printf(s, "+ ");
+        }
+
+        return trace_seq_printf(s, "  ");
+}
+
 static enum print_line_t
 print_graph_irq(struct trace_seq *s, unsigned long addr,
-                                enum trace_type type, int cpu, pid_t pid)
+                enum trace_type type, int cpu, pid_t pid)
 {
         int ret;
 
@@ -242,35 +282,40 @@ print_graph_irq(struct trace_seq *s, unsigned long addr,
                 addr >= (unsigned long)__irqentry_text_end)
                 return TRACE_TYPE_UNHANDLED;
 
-        if (type == TRACE_GRAPH_ENT) {
-                ret = trace_seq_printf(s, "==========> |  ");
-        } else {
-                /* Cpu */
-                if (tracer_flags.val & 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) {
-                        ret = print_graph_proc(s, pid);
-                        if (ret == TRACE_TYPE_PARTIAL_LINE)
-                                return TRACE_TYPE_PARTIAL_LINE;
+        /* Cpu */
+        if (tracer_flags.val & 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) {
+                ret = print_graph_proc(s, pid);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+                ret = trace_seq_printf(s, " | ");
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
 
-                        ret = trace_seq_printf(s, " | ");
-                        if (!ret)
-                                return TRACE_TYPE_PARTIAL_LINE;
-                }
+        /* No overhead */
+        ret = print_graph_overhead(-1, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
 
-                /* No overhead */
-                if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                        ret = trace_seq_printf(s, "  ");
-                        if (!ret)
-                                return TRACE_TYPE_PARTIAL_LINE;
-                }
+        if (type == TRACE_GRAPH_ENT)
+                ret = trace_seq_printf(s, "==========>");
+        else
+                ret = trace_seq_printf(s, "<==========");
+
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Don't close the duration column if haven't one */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+                trace_seq_printf(s, " |");
+        ret = trace_seq_printf(s, "\n");
 
-                ret = trace_seq_printf(s, "<========== |\n");
-        }
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
         return TRACE_TYPE_HANDLED;
@@ -289,7 +334,7 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
         sprintf(msecs_str, "%lu", (unsigned long) duration);
 
         /* Print msecs */
-        ret = trace_seq_printf(s, msecs_str);
+        ret = trace_seq_printf(s, "%s", msecs_str);
         if (!ret)
                 return TRACE_TYPE_PARTIAL_LINE;
 
@@ -322,19 +367,15 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
 
 }
 
-/* Signal a overhead of time execution to the output */
-static int
-print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+static int print_graph_abs_time(u64 t, struct trace_seq *s)
 {
-        /* Duration exceeded 100 msecs */
-        if (duration > 100000ULL)
-                return trace_seq_printf(s, "! ");
+        unsigned long usecs_rem;
 
-        /* Duration exceeded 10 msecs */
-        if (duration > 10000ULL)
-                return trace_seq_printf(s, "+ ");
+        usecs_rem = do_div(t, 1000000000);
+        usecs_rem /= 1000;
 
-        return trace_seq_printf(s, "  ");
+        return trace_seq_printf(s, "%5lu.%06lu |  ",
+                        (unsigned long)t, usecs_rem);
 }
 
 /* Case of a leaf function on its call entry */
@@ -357,16 +398,16 @@ print_graph_entry_leaf(struct trace_iterator *iter,
         duration = graph_ret->rettime - graph_ret->calltime;
 
         /* Overhead */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                ret = print_graph_overhead(duration, s);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
+        ret = print_graph_overhead(duration, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
 
         /* Duration */
-        ret = print_graph_duration(duration, s);
-        if (ret == TRACE_TYPE_PARTIAL_LINE)
-                return TRACE_TYPE_PARTIAL_LINE;
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+                ret = print_graph_duration(duration, s);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
 
         /* Function */
         for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
@@ -395,25 +436,17 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
         struct ftrace_graph_ent *call = &entry->graph_ent;
 
         /* No overhead */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                ret = trace_seq_printf(s, "  ");
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
+        ret = print_graph_overhead(-1, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
 
-        /* Interrupt */
-        ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
-        if (ret == TRACE_TYPE_UNHANDLED) {
-                /* No time */
+        /* No time */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
                 ret = trace_seq_printf(s, "            |  ");
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
-        } else {
-                if (ret == TRACE_TYPE_PARTIAL_LINE)
-                        return TRACE_TYPE_PARTIAL_LINE;
         }
 
-
         /* Function */
         for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
                 ret = trace_seq_printf(s, " ");
@@ -434,15 +467,30 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
 
 static enum print_line_t
 print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
-                        struct trace_iterator *iter, int cpu)
+                        struct trace_iterator *iter)
 {
         int ret;
+        int cpu = iter->cpu;
+        pid_t *last_entry = iter->private;
         struct trace_entry *ent = iter->ent;
+        struct ftrace_graph_ent *call = &field->graph_ent;
 
         /* Pid */
-        if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+        if (verif_pid(s, ent->pid, cpu, last_entry) == TRACE_TYPE_PARTIAL_LINE)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* Interrupt */
+        ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, ent->pid);
+        if (ret == TRACE_TYPE_PARTIAL_LINE)
                 return TRACE_TYPE_PARTIAL_LINE;
 
+        /* Absolute time */
+        if (tracer_flags.val & 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) {
                 ret = print_graph_cpu(s, cpu);
@@ -470,16 +518,25 @@ 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, int cpu)
+                   struct trace_entry *ent, struct trace_iterator *iter)
 {
         int i;
         int ret;
+        int cpu = iter->cpu;
+        pid_t *last_pid = iter->private;
         unsigned long long duration = trace->rettime - trace->calltime;
 
         /* Pid */
-        if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+        if (verif_pid(s, ent->pid, cpu, last_pid) == TRACE_TYPE_PARTIAL_LINE)
                 return TRACE_TYPE_PARTIAL_LINE;
 
+        /* Absolute time */
+        if (tracer_flags.val & 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) {
                 ret = print_graph_cpu(s, cpu);
@@ -499,16 +556,16 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
         }
 
         /* Overhead */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                ret = print_graph_overhead(duration, s);
-                if (!ret)
-                        return TRACE_TYPE_PARTIAL_LINE;
-        }
+        ret = print_graph_overhead(duration, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
 
         /* Duration */
-        ret = print_graph_duration(duration, s);
-        if (ret == TRACE_TYPE_PARTIAL_LINE)
-                return TRACE_TYPE_PARTIAL_LINE;
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+                ret = print_graph_duration(duration, s);
+                if (ret == TRACE_TYPE_PARTIAL_LINE)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
 
         /* Closing brace */
         for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
@@ -542,14 +599,23 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
 {
         int i;
         int ret;
+        int cpu = iter->cpu;
+        pid_t *last_pid = iter->private;
+
+        /* Absolute time */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+                ret = print_graph_abs_time(iter->ts, s);
+                if (!ret)
+                        return TRACE_TYPE_PARTIAL_LINE;
+        }
 
         /* Pid */
-        if (verif_pid(s, ent->pid, iter->cpu) == TRACE_TYPE_PARTIAL_LINE)
+        if (verif_pid(s, ent->pid, cpu, last_pid) == TRACE_TYPE_PARTIAL_LINE)
                 return TRACE_TYPE_PARTIAL_LINE;
 
         /* Cpu */
         if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
-                ret = print_graph_cpu(s, iter->cpu);
+                ret = print_graph_cpu(s, cpu);
                 if (ret == TRACE_TYPE_PARTIAL_LINE)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
@@ -566,17 +632,17 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
         }
 
         /* No overhead */
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                ret = trace_seq_printf(s, "  ");
+        ret = print_graph_overhead(-1, s);
+        if (!ret)
+                return TRACE_TYPE_PARTIAL_LINE;
+
+        /* No time */
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+                ret = trace_seq_printf(s, "            |  ");
                 if (!ret)
                         return TRACE_TYPE_PARTIAL_LINE;
         }
 
-        /* No time */
-        ret = trace_seq_printf(s, "            |  ");
-        if (!ret)
-                return TRACE_TYPE_PARTIAL_LINE;
-
         /* Indentation */
         if (trace->depth > 0)
                 for (i = 0; i < (trace->depth + 1) * TRACE_GRAPH_INDENT; i++) {
@@ -614,13 +680,12 @@ print_graph_function(struct trace_iterator *iter)
         case TRACE_GRAPH_ENT: {
                 struct ftrace_graph_ent_entry *field;
                 trace_assign_type(field, entry);
-                return print_graph_entry(field, s, iter,
-                                         iter->cpu);
+                return print_graph_entry(field, s, iter);
         }
         case TRACE_GRAPH_RET: {
                 struct ftrace_graph_ret_entry *field;
                 trace_assign_type(field, entry);
-                return print_graph_return(&field->ret, s, entry, iter->cpu);
+                return print_graph_return(&field->ret, s, entry, iter);
         }
         case TRACE_PRINT: {
                 struct print_entry *field;
@@ -636,28 +701,55 @@ static void print_graph_headers(struct seq_file *s)
 {
         /* 1st line */
         seq_printf(s, "# ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+                seq_printf(s, "     TIME       ");
         if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
-                seq_printf(s, "CPU ");
+                seq_printf(s, "CPU");
         if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
-                seq_printf(s, "TASK/PID     ");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD)
-                seq_printf(s, "OVERHEAD/");
-        seq_printf(s, "DURATION            FUNCTION CALLS\n");
+                seq_printf(s, "  TASK/PID      ");
+        if (tracer_flags.val & 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)
+                seq_printf(s, "      |         ");
         if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
-                seq_printf(s, "|   ");
+                seq_printf(s, "|  ");
         if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
-                seq_printf(s, "|      |     ");
-        if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
-                seq_printf(s, "|        ");
-                seq_printf(s, "|                   |   |   |   |\n");
-        } else
-                seq_printf(s, "    |               |   |   |   |\n");
+                seq_printf(s, "  |    |        ");
+        if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+                seq_printf(s, "   |   |      ");
+        seq_printf(s, "               |   |   |   |\n");
 }
+
+static void graph_trace_open(struct trace_iterator *iter)
+{
+        /* pid on the last trace processed */
+        pid_t *last_pid = alloc_percpu(pid_t);
+        int cpu;
+
+        if (!last_pid)
+                pr_warning("function graph tracer: not enough memory\n");
+        else
+                for_each_possible_cpu(cpu) {
+                        pid_t *pid = per_cpu_ptr(last_pid, cpu);
+                        *pid = -1;
+                }
+
+        iter->private = last_pid;
+}
+
+static void graph_trace_close(struct trace_iterator *iter)
+{
+        percpu_free(iter->private);
+}
+
 static struct tracer graph_trace __read_mostly = {
         .name           = "function_graph",
+        .open           = graph_trace_open,
+        .close          = graph_trace_close,
         .init           = graph_trace_init,
         .reset          = graph_trace_reset,
         .print_line     = print_graph_function,