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tracing/filters: Refactor subsystem filter code 

Change:
	for_each_pred
		for_each_subsystem
To:
	for_each_subsystem
		for_each_pred

This change also prepares for later patches.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <4AD69502.8060903@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-10-15 11:20:34 +08:00 committed by Ingo Molnar
parent 713490e02e
commit fce29d15b5
2 changed files with 45 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
kernel/trace/trace.h
View File

@ -683,7 +683,6 @@ struct event_filter {
int n_preds;
struct filter_pred **preds;
char *filter_string;
bool no_reset;
};
struct event_subsystem {

124
kernel/trace/trace_events_filter.c
View File

@ -615,14 +615,7 @@ static int init_subsystem_preds(struct event_subsystem *system)
return 0;
}
enum {
FILTER_DISABLE_ALL,
FILTER_INIT_NO_RESET,
FILTER_SKIP_NO_RESET,
};
static void filter_free_subsystem_preds(struct event_subsystem *system,
int flag)
static void filter_free_subsystem_preds(struct event_subsystem *system)
{
struct ftrace_event_call *call;
@ -633,14 +626,6 @@ static void filter_free_subsystem_preds(struct event_subsystem *system,
if (strcmp(call->system, system->name) != 0)
continue;
if (flag == FILTER_INIT_NO_RESET) {
call->filter->no_reset = false;
continue;
}
if (flag == FILTER_SKIP_NO_RESET && call->filter->no_reset)
continue;
filter_disable_preds(call);
remove_filter_string(call->filter);
}
@ -817,44 +802,6 @@ add_pred_fn:
return 0;
}
static int filter_add_subsystem_pred(struct filter_parse_state *ps,
struct event_subsystem *system,
struct filter_pred *pred,
char *filter_string,
bool dry_run)
{
struct ftrace_event_call *call;
int err = 0;
bool fail = true;
list_for_each_entry(call, &ftrace_events, list) {
if (!call->define_fields)
continue;
if (strcmp(call->system, system->name))
continue;
if (call->filter->no_reset)
continue;
err = filter_add_pred(ps, call, pred, dry_run);
if (err)
call->filter->no_reset = true;
else
fail = false;
if (!dry_run)
replace_filter_string(call->filter, filter_string);
}
if (fail) {
parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0);
return err;
}
return 0;
}
static void parse_init(struct filter_parse_state *ps,
struct filter_op *ops,
char *infix_string)
@ -1209,8 +1156,7 @@ static int check_preds(struct filter_parse_state *ps)
return 0;
}
static int replace_preds(struct event_subsystem *system,
struct ftrace_event_call *call,
static int replace_preds(struct ftrace_event_call *call,
struct filter_parse_state *ps,
char *filter_string,
bool dry_run)
@ -1257,11 +1203,7 @@ static int replace_preds(struct event_subsystem *system,
add_pred:
if (!pred)
return -ENOMEM;
if (call)
err = filter_add_pred(ps, call, pred, false);
else
err = filter_add_subsystem_pred(ps, system, pred,
filter_string, dry_run);
err = filter_add_pred(ps, call, pred, dry_run);
filter_free_pred(pred);
if (err)
return err;
@ -1272,6 +1214,44 @@ add_pred:
return 0;
}
static int replace_system_preds(struct event_subsystem *system,
struct filter_parse_state *ps,
char *filter_string)
{
struct ftrace_event_call *call;
int err;
bool fail = true;
list_for_each_entry(call, &ftrace_events, list) {
if (!call->define_fields)
continue;
if (strcmp(call->system, system->name) != 0)
continue;
/* try to see if the filter can be applied */
err = replace_preds(call, ps, filter_string, true);
if (err)
continue;
/* really apply the filter */
filter_disable_preds(call);
err = replace_preds(call, ps, filter_string, false);
if (err)
filter_disable_preds(call);
else
replace_filter_string(call->filter, filter_string);
fail = false;
}
if (fail) {
parse_error(ps, FILT_ERR_BAD_SUBSYS_FILTER, 0);
return err;
}
return 0;
}
int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
{
int err;
@ -1306,7 +1286,7 @@ int apply_event_filter(struct ftrace_event_call *call, char *filter_string)
goto out;
}
err = replace_preds(NULL, call, ps, filter_string, false);
err = replace_preds(call, ps, filter_string, false);
if (err)
append_filter_err(ps, call->filter);
@ -1334,7 +1314,7 @@ int apply_subsystem_event_filter(struct event_subsystem *system,
goto out_unlock;
if (!strcmp(strstrip(filter_string), "0")) {
filter_free_subsystem_preds(system, FILTER_DISABLE_ALL);
filter_free_subsystem_preds(system);
remove_filter_string(system->filter);
mutex_unlock(&event_mutex);
return 0;
@ -1354,23 +1334,9 @@ int apply_subsystem_event_filter(struct event_subsystem *system,
goto out;
}
filter_free_subsystem_preds(system, FILTER_INIT_NO_RESET);
/* try to see the filter can be applied to which events */
err = replace_preds(system, NULL, ps, filter_string, true);
if (err) {
err = replace_system_preds(system, ps, filter_string);
if (err)
append_filter_err(ps, system->filter);
goto out;
}
filter_free_subsystem_preds(system, FILTER_SKIP_NO_RESET);
/* really apply the filter to the events */
err = replace_preds(system, NULL, ps, filter_string, false);
if (err) {
append_filter_err(ps, system->filter);
filter_free_subsystem_preds(system, 2);
}
out:
filter_opstack_clear(ps);