ASCII art for dep analysis

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/lttv/modules/text/depanalysis.c b/lttv/modules/text/depanalysis.c
index 2dfc522b2e9c6381b1c5169fd704dfae5aa0138a..5a4064aefa9b5c949b001e90831777307e135f91 100644 (file)
--- a/lttv/modules/text/depanalysis.c
+++ b/lttv/modules/text/depanalysis.c
@@ -907,6 +907,20 @@ static struct process_state *find_state_ending_after(int pid, LttTime t)
                return g_array_index(p->hlev_history, struct process_state *, result);
 }
 
+static void print_indent(int offset)
+{
+       if (offset > 2) {
+               int i;
+
+               printf("%*s", 8, "");
+               for (i = 3; i < offset; i++) {
+                       printf("|");
+                       printf("%*s", 4, "");
+               }
+       } else
+               printf("%*s", 4*offset, "");
+}
+
 static void print_delay_pid(int pid, LttTime t1, LttTime t2, int offset)
 {
        struct process *p;
@@ -927,8 +941,8 @@ static void print_delay_pid(int pid, LttTime t1, LttTime t2, int offset)
                        state_private_blocked = pstate->private;
                        struct process_state *state_unblocked;
 
-                       printf("%*s", 8*offset, "");
-                       printf("Blocked in ");
+                       print_indent(offset);
+                       printf("--> Blocked in ");
                        print_stack_garray_horizontal(state_private_blocked->llev_state_entry);
 
                        printf("(times: ");
@@ -943,15 +957,15 @@ static void print_delay_pid(int pid, LttTime t1, LttTime t2, int offset)
                                if(state_unblocked->bstate == HLEV_INTERRUPTED_IRQ) {
                                        struct hlev_state_info_interrupted_irq *priv = state_unblocked->private;
                                        /* if in irq or softirq, we don't care what the waking process was doing because they are asynchroneous events */
-                                       printf("%*s", 8*offset, "");
-                                       printf("Woken up by an IRQ: ");
+                                       print_indent(offset);
+                                       printf("--- Woken up by an IRQ: ");
                                        print_irq(priv->irq);
                                        printf("\n");
                                }
                                else if(state_unblocked->bstate == HLEV_INTERRUPTED_SOFTIRQ) {
                                        struct hlev_state_info_interrupted_softirq *priv = state_unblocked->private;
-                                       printf("%*s", 8*offset, "");
-                                       printf("Woken up by a SoftIRQ: ");
+                                       print_indent(offset);
+                                       printf("--- Woken up by a SoftIRQ: ");
                                        print_softirq(priv->softirq);
                                        printf("\n");
                                }
@@ -965,8 +979,8 @@ static void print_delay_pid(int pid, LttTime t1, LttTime t2, int offset)
                                                t2prime = pstate->time_end;
 
                                        print_delay_pid(state_private_blocked->pid_exit, t1prime, t2prime, offset+1);
-                                       printf("%*s", 8*offset, "");
-                                       printf("Woken up in context of ");
+                                       print_indent(offset);
+                                       printf("--- Woken up in context of ");
                                        print_pid(state_private_blocked->pid_exit);
                                        if(state_private_blocked->llev_state_exit) {
                                                print_stack_garray_horizontal(state_private_blocked->llev_state_exit);
@@ -978,7 +992,7 @@ static void print_delay_pid(int pid, LttTime t1, LttTime t2, int offset)
                                }
                        }
                        else {
-                               printf("%*s", 8*offset, "");
+                               print_indent(offset);
                                printf("Weird... cannot find in what state the waker (%d) was\n", state_private_blocked->pid_exit);
                        }
 
@@ -1003,6 +1017,17 @@ static void print_range_critical_path(int process, LttTime t1, LttTime t2)
        print_delay_pid(process, t1, t2, 2);
 }
 
+/*
+ * output legend example:
+ *
+ *           --> Blocked in RUNNING, SYSCALL NNN [syscall_name]
+ *           |      ---> Blocked in RUNNING, SYSCALL NNN [syscall_name]
+ *           |      |        --> Blocked in RUNNING, SYSCALL  [syscall_name]
+ *           |      |        --- Woken up by an IRQ: IRQ 0 [timer]
+ *           |      ---  Woken up in context of PID [appname] in high-level state RUNNING
+ *           --- Woken up in context of PID [appname] in high-level state RUNNING
+ */
+
 static void print_process_critical_path_summary()
 {
        struct process *pinfo;