[PATCH 14/15] ftrace: add pretty print to selected fuction traces

Steven Rostedt
2009-02-17T05:18:32Z

[-- Attachment #1: 0014-ftrace-add-pretty-print-to-selected-fuction-traces.patch --]
[-- Type: text/plain, Size: 1496 bytes --]

From: Steven Rostedt <srostedt@redhat.com>

This patch adds a call back for the tracers that have hooks to
selected functions. This allows the tracer to show better output
in the set_ftrace_filter file.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---
include/linux/ftrace.h | 6 ++++++
kernel/trace/ftrace.c | 3 +++
2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 13918c4..b331e21 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -106,12 +106,18 @@ struct ftrace_func_command {
/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
#include <asm/ftrace.h>

+struct seq_file;
+
struct ftrace_hook_ops {
void (*func)(unsigned long ip,
unsigned long parent_ip,
void **data);
int (*callback)(unsigned long ip, void **data);
void (*free)(void **data);
+ int (*print)(struct seq_file *m,
+ unsigned long ip,
+ struct ftrace_hook_ops *ops,
+ void *data);
};

extern int
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 1e05884..6533c1d 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -834,6 +834,9 @@ static int t_hash_show(struct seq_file *m, void *v)

rec = hlist_entry(hnd, struct ftrace_func_hook, node);

+ if (rec->ops->print)
+ return rec->ops->print(m, rec->ip, rec->ops, rec->data);
+
kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
seq_printf(m, "%s:", str);

--
1.5.6.5

--