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ftrace: add pretty print to selected fuction traces 

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>
This commit is contained in:
Steven Rostedt 2009-02-16 23:06:01 -05:00
parent 8fc0c701c5
commit 809dcf29ce
2 changed files with 9 additions and 0 deletions
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6
include/linux/ftrace.h
View File

@ -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

3
kernel/trace/ftrace.c
View File

@ -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);