trace-graph: Add destructor routine to plot callbacks

Added a destructor routine to the plot callbacks to be called before
the plot is destroyed. This allows the plot to clean up any resources
that it allocated before it is freed.

Also did some other minor clean ups and freeing.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/trace-plot-cpu.c b/trace-plot-cpu.c
index 6918ae4..7fd9ecc 100644
--- a/trace-plot-cpu.c
+++ b/trace-plot-cpu.c
@@ -4,7 +4,6 @@
 
 struct cpu_plot_info {
         int                     cpu;
-        struct record           *record;
         unsigned long long      last_time;
         int                     last_pid;
 };
@@ -177,7 +176,6 @@ static void cpu_plot_start(struct graph_info *ginfo, struct graph_plot *plot,
         int cpu;
 
         cpu = cpu_info->cpu;
-        cpu_info->record = NULL;
         cpu_info->last_time = 0ULL;
         cpu_info->last_pid = -1;
 
@@ -396,6 +394,13 @@ int cpu_plot_display_info(struct graph_info *ginfo,
         return 1;
 }
 
+void cpu_plot_destroy(struct graph_info *ginfo, struct graph_plot *plot)
+{
+        struct cpu_plot_info *cpu_info = plot->private;
+
+        free(cpu_info);
+}
+
 static const struct plot_callbacks cpu_plot_cb = {
         .match_time             = cpu_plot_match_time,
         .plot_event             = cpu_plot_event,
@@ -403,6 +408,7 @@ static const struct plot_callbacks cpu_plot_cb = {
         .display_last_event     = cpu_plot_display_last_event,
         .find_record            = cpu_plot_find_record,
         .display_info           = cpu_plot_display_info,
+        .destroy                = cpu_plot_destroy
 };
 
 void graph_plot_init_cpus(struct graph_info *ginfo, int cpus)