From: Masami Hiramatsu <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Tom Zanussi <tom.zanussi@linux.intel.com>,
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Subject: [PATCH v2 03/12] tracing: Simplify creation and deletion of synthetic event
Date: Mon, 5 Nov 2018 18:01:12 +0900 [thread overview]
Message-ID: <154140847194.17322.17960275728005067803.stgit@devbox> (raw)
In-Reply-To: <154140838606.17322.15294184388075458777.stgit@devbox>
Simplify creation and deletion code of synthetic event.
Since the event_mutex and synth_event_mutex ordering issue
is gone, we can skip existing event check when adding or
deleting event, and some redundant code in error path.
This changes release_all_synth_events() to abort the process
when it hits any error and returns the error code. It succeeds
only if it has no error.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
kernel/trace/trace_events_hist.c | 53 +++++++++++++-------------------------
1 file changed, 18 insertions(+), 35 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 1670c65389fe..0feb7f460123 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1008,18 +1008,6 @@ struct hist_var_data {
struct hist_trigger_data *hist_data;
};
-static void add_or_delete_synth_event(struct synth_event *event, int delete)
-{
- if (delete)
- free_synth_event(event);
- else {
- if (!find_synth_event(event->name))
- list_add(&event->list, &synth_event_list);
- else
- free_synth_event(event);
- }
-}
-
static int create_synth_event(int argc, char **argv)
{
struct synth_field *field, *fields[SYNTH_FIELDS_MAX];
@@ -1052,15 +1040,16 @@ static int create_synth_event(int argc, char **argv)
if (event) {
if (delete_event) {
if (event->ref) {
- event = NULL;
ret = -EBUSY;
goto out;
}
- list_del(&event->list);
- goto out;
- }
- event = NULL;
- ret = -EEXIST;
+ ret = unregister_synth_event(event);
+ if (!ret) {
+ list_del(&event->list);
+ free_synth_event(event);
+ }
+ } else
+ ret = -EEXIST;
goto out;
} else if (delete_event) {
ret = -ENOENT;
@@ -1100,29 +1089,21 @@ static int create_synth_event(int argc, char **argv)
event = NULL;
goto err;
}
+ ret = register_synth_event(event);
+ if (!ret)
+ list_add(&event->list, &synth_event_list);
+ else
+ free_synth_event(event);
out:
- if (event) {
- if (delete_event) {
- ret = unregister_synth_event(event);
- add_or_delete_synth_event(event, !ret);
- } else {
- ret = register_synth_event(event);
- add_or_delete_synth_event(event, ret);
- }
- }
mutex_unlock(&synth_event_mutex);
mutex_unlock(&event_mutex);
return ret;
err:
- mutex_unlock(&synth_event_mutex);
- mutex_unlock(&event_mutex);
-
for (i = 0; i < n_fields; i++)
free_synth_field(fields[i]);
- free_synth_event(event);
- return ret;
+ goto out;
}
static int release_all_synth_events(void)
@@ -1141,10 +1122,12 @@ static int release_all_synth_events(void)
}
list_for_each_entry_safe(event, e, &synth_event_list, list) {
- list_del(&event->list);
-
ret = unregister_synth_event(event);
- add_or_delete_synth_event(event, !ret);
+ if (!ret) {
+ list_del(&event->list);
+ free_synth_event(event);
+ } else
+ break;
}
mutex_unlock(&synth_event_mutex);
mutex_unlock(&event_mutex);
next prev parent reply other threads:[~2018-11-05 9:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-05 8:59 [PATCH v2 00/12] tracing: Unifying dynamic event interface Masami Hiramatsu
2018-11-05 9:00 ` [PATCH v2 01/12] tracing/uprobes: Add busy check when cleanup all uprobes Masami Hiramatsu
2018-12-04 17:43 ` Steven Rostedt
2018-12-07 2:19 ` Masami Hiramatsu
2018-11-05 9:00 ` [PATCH v2 02/12] tracing: Lock event_mutex before synth_event_mutex Masami Hiramatsu
2018-11-05 9:01 ` Masami Hiramatsu [this message]
2018-11-05 9:01 ` [PATCH v2 04/12] tracing: Integrate similar probe argument parsers Masami Hiramatsu
2018-11-05 9:02 ` [PATCH v2 05/12] tracing: Add unified dynamic event framework Masami Hiramatsu
2018-11-05 9:02 ` [PATCH v2 06/12] tracing/kprobes: Use dyn_event framework for kprobe events Masami Hiramatsu
2018-11-05 9:03 ` [PATCH v2 07/12] tracing/uprobes: Use dyn_event framework for uprobe events Masami Hiramatsu
2018-11-05 9:03 ` [PATCH v2 08/12] tracing: Use dyn_event framework for synthetic events Masami Hiramatsu
2018-11-05 9:04 ` [PATCH v2 09/12] tracing: Remove unneeded synth_event_mutex Masami Hiramatsu
2018-11-05 9:04 ` [PATCH v2 10/12] tracing: Remove orphaned trace_add/remove_event_call functions Masami Hiramatsu
2018-12-04 18:51 ` Steven Rostedt
2018-12-07 2:22 ` Masami Hiramatsu
2018-11-05 9:04 ` [PATCH v2 11/12] tracing: Add generic event-name based remove event method Masami Hiramatsu
2018-11-05 9:05 ` [PATCH v2 12/12] selftests/ftrace: Add testcases for dynamic event Masami Hiramatsu
2018-11-28 7:31 ` [PATCH v2 00/12] tracing: Unifying dynamic event interface Masami Hiramatsu
2018-11-28 23:42 ` Tom Zanussi
2018-11-29 3:46 ` Steven Rostedt
2018-11-29 5:20 ` Masami Hiramatsu
2018-11-29 15:08 ` Tom Zanussi
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