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tracing: make the set_event and available_events subsystem aware 

This patch makes the event files, set_event and available_events
aware of the subsystem.

Now you can enable an entire subsystem with:

  echo 'irq:*' > set_event

Note: the '*' is not needed.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
This commit is contained in:
Steven Rostedt 2009-02-27 23:32:58 -05:00
parent 6ecc2d1ca3
commit b628b3e629
1 changed files with 40 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
kernel/trace/trace_events.c
View File

@ -12,6 +12,8 @@
#include "trace_events.h"
#define TRACE_SYSTEM "TRACE_SYSTEM"
#define events_for_each(event) \
for (event = __start_ftrace_events; \
(unsigned long)event < (unsigned long)__stop_ftrace_events; \
@ -45,14 +47,47 @@ static void ftrace_clear_events(void)
static int ftrace_set_clr_event(char *buf, int set)
{
struct ftrace_event_call *call = __start_ftrace_events;
char *event = NULL, *sub = NULL, *match;
int ret = -EINVAL;
/*
* The buf format can be <subsystem>:<event-name>
* *:<event-name> means any event by that name.
* :<event-name> is the same.
*
* <subsystem>:* means all events in that subsystem
* <subsystem>: means the same.
*
* <name> (no ':') means all events in a subsystem with
* the name <name> or any event that matches <name>
*/
match = strsep(&buf, ":");
if (buf) {
sub = match;
event = buf;
match = NULL;
if (!strlen(sub) || strcmp(sub, "*") == 0)
sub = NULL;
if (!strlen(event) || strcmp(event, "*") == 0)
event = NULL;
}
events_for_each(call) {
if (!call->name)
continue;
if (strcmp(buf, call->name) != 0)
if (match &&
strcmp(match, call->name) != 0 &&
strcmp(match, call->system) != 0)
continue;
if (sub && strcmp(sub, call->system) != 0)
continue;
if (event && strcmp(event, call->name) != 0)
continue;
if (set) {
@ -68,9 +103,9 @@ static int ftrace_set_clr_event(char *buf, int set)
call->enabled = 0;
call->unregfunc();
}
return 0;
ret = 0;
}
return -EINVAL;
return ret;
}
/* 128 should be much more than enough */
@ -200,6 +235,8 @@ static int t_show(struct seq_file *m, void *v)
{
struct ftrace_event_call *call = v;
if (strcmp(call->system, TRACE_SYSTEM) != 0)
seq_printf(m, "%s:", call->system);
seq_printf(m, "%s\n", call->name);
return 0;