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ftrace: add command interface for function selection

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Allow for other tracers to add their own commands for function
selection. This interface gives a trace the ability to name a
command for function selection. Right now it is pretty limited
in what it offers, but this is a building step for more features.

The :mod: command is converted to this interface and also serves
as a template for other implementations.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt
2009-02-14 00:40:25 -05:00
parent e68746a271
commit f6180773d9
2 changed files with 111 additions and 11 deletions
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16
include/linux/ftrace.h
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@@ -95,6 +95,13 @@ stack_trace_sysctl(struct ctl_table *table, int write,
loff_t *ppos);
#endif
struct ftrace_func_command {
struct list_head list;
char *name;
int (*func)(char *func, char *cmd,
char *params, int enable);
};
#ifdef CONFIG_DYNAMIC_FTRACE
/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
#include <asm/ftrace.h>
@@ -119,6 +126,9 @@ struct dyn_ftrace {
int ftrace_force_update(void);
void ftrace_set_filter(unsigned char *buf, int len, int reset);
int register_ftrace_command(struct ftrace_func_command *cmd);
int unregister_ftrace_command(struct ftrace_func_command *cmd);
/* defined in arch */
extern int ftrace_ip_converted(unsigned long ip);
extern int ftrace_dyn_arch_init(void *data);
@@ -202,6 +212,12 @@ extern void ftrace_enable_daemon(void);
# define ftrace_disable_daemon() do { } while (0)
# define ftrace_enable_daemon() do { } while (0)
static inline void ftrace_release(void *start, unsigned long size) { }
static inline int register_ftrace_command(struct ftrace_func_command *cmd)
{
}
static inline int unregister_ftrace_command(char *cmd_name)
{
}
#endif /* CONFIG_DYNAMIC_FTRACE */
/* totally disable ftrace - can not re-enable after this */