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ftrace: add thread comm to function graph tracer 

Impact: enhancement to function graph tracer

Export the trace_find_cmdline so the function graph tracer can
use it to print the comms of the threads.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-11-26 00:16:26 -05:00 committed by Ingo Molnar
parent e53a6319cc
commit 660c7f9be9
3 changed files with 18 additions and 6 deletions
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2
kernel/trace/trace.c
View File

@ -804,7 +804,7 @@ static void trace_save_cmdline(struct task_struct *tsk)
spin_unlock(&trace_cmdline_lock);
}
static char *trace_find_cmdline(int pid)
char *trace_find_cmdline(int pid)
{
char *cmdline = "<...>";
unsigned map;

1
kernel/trace/trace.h
View File

@ -450,6 +450,7 @@ struct tracer_switch_ops {
struct tracer_switch_ops *next;
};
char *trace_find_cmdline(int pid);
#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
#ifdef CONFIG_DYNAMIC_FTRACE

21
kernel/trace/trace_functions_graph.c
View File

@ -32,29 +32,40 @@ static pid_t last_pid = -1;
static int graph_trace_init(struct trace_array *tr)
{
int cpu;
int cpu, ret;
for_each_online_cpu(cpu)
tracing_reset(tr, cpu);
return register_ftrace_graph(&trace_graph_return,
ret = register_ftrace_graph(&trace_graph_return,
&trace_graph_entry);
if (ret)
return ret;
tracing_start_cmdline_record();
return 0;
}
static void graph_trace_reset(struct trace_array *tr)
{
unregister_ftrace_graph();
tracing_stop_cmdline_record();
unregister_ftrace_graph();
}
/* If the pid changed since the last trace, output this event */
static int verif_pid(struct trace_seq *s, pid_t pid)
{
char *comm;
if (last_pid != -1 && last_pid == pid)
return 1;
last_pid = pid;
return trace_seq_printf(s, "\n------------8<---------- thread %d"
comm = trace_find_cmdline(pid);
return trace_seq_printf(s, "\n------------8<---------- thread %s-%d"
" ------------8<----------\n\n",
pid);
comm, pid);
}
static enum print_line_t