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[PATCH v4 03/13] trace: add trace_event_iter_init_group
From: |
Gerd Hoffmann |
Subject: |
[PATCH v4 03/13] trace: add trace_event_iter_init_group |
Date: |
Tue, 1 Jun 2021 15:24:04 +0200 |
This allows to interate over an event group.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
trace/control.h | 13 +++++++++++++
trace/control.c | 19 ++++++++++++++++---
2 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/trace/control.h b/trace/control.h
index ce40bd040574..23b8393b297e 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -13,8 +13,11 @@
#include "event-internal.h"
typedef struct TraceEventIter {
+ /* iter state */
size_t event;
size_t group;
+ /* filter conditions */
+ size_t group_id;
const char *pattern;
} TraceEventIter;
@@ -39,6 +42,16 @@ void trace_event_iter_init_all(TraceEventIter *iter);
*/
void trace_event_iter_init_pattern(TraceEventIter *iter, const char *pattern);
+/**
+ * trace_event_iter_init_group:
+ * @iter: the event iterator struct
+ * @group_id: group_id to filter events by group.
+ *
+ * Initialize the event iterator struct @iter,
+ * using @group_id to filter for events in the group.
+ */
+void trace_event_iter_init_group(TraceEventIter *iter, size_t group_id);
+
/**
* trace_event_iter_next:
* @iter: the event iterator struct
diff --git a/trace/control.c b/trace/control.c
index ed38e813b23d..2c904b7ee4c6 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -104,6 +104,7 @@ void trace_event_iter_init_all(TraceEventIter *iter)
{
iter->event = 0;
iter->group = 0;
+ iter->group_id = -1;
iter->pattern = NULL;
}
@@ -113,20 +114,32 @@ void trace_event_iter_init_pattern(TraceEventIter *iter,
const char *pattern)
iter->pattern = pattern;
}
+void trace_event_iter_init_group(TraceEventIter *iter, size_t group_id)
+{
+ trace_event_iter_init_all(iter);
+ iter->group_id = group_id;
+}
+
TraceEvent *trace_event_iter_next(TraceEventIter *iter)
{
while (iter->group < nevent_groups &&
event_groups[iter->group].events[iter->event] != NULL) {
TraceEvent *ev = event_groups[iter->group].events[iter->event];
+ size_t group = iter->group;
iter->event++;
if (event_groups[iter->group].events[iter->event] == NULL) {
iter->event = 0;
iter->group++;
}
- if (!iter->pattern ||
- g_pattern_match_simple(iter->pattern, trace_event_get_name(ev))) {
- return ev;
+ if (iter->pattern &&
+ !g_pattern_match_simple(iter->pattern, trace_event_get_name(ev))) {
+ continue;
}
+ if (iter->group_id != -1 &&
+ iter->group_id != group) {
+ continue;
+ }
+ return ev;
}
return NULL;
--
2.31.1
- [PATCH v4 00/13] [RfC] fix tracing for modules, Gerd Hoffmann, 2021/06/01
- [PATCH v4 01/13] qemu-trace-stap: changing SYSTEMTAP_TAPSET considered harmful., Gerd Hoffmann, 2021/06/01
- [PATCH v4 03/13] trace: add trace_event_iter_init_group,
Gerd Hoffmann <=
- [PATCH v4 02/13] trace: iter init tweaks, Gerd Hoffmann, 2021/06/01
- [PATCH v4 04/13] trace/simple: pass iter to st_write_event_mapping, Gerd Hoffmann, 2021/06/01
- [PATCH v4 05/13] trace/simple: add st_init_group, Gerd Hoffmann, 2021/06/01
- [PATCH v4 06/13] meson: add trace_events_config[], Gerd Hoffmann, 2021/06/01
- [PATCH v4 07/13] meson: move up hw subdir (specifically before trace subdir), Gerd Hoffmann, 2021/06/01
- [PATCH v4 09/13] trace/stap: build stap files for modules, Gerd Hoffmann, 2021/06/01
- [PATCH v4 08/13] meson: add module_trace & module_trace_src, Gerd Hoffmann, 2021/06/01
- [PATCH v4 10/13] meson: move qxl trace events to separate file, Gerd Hoffmann, 2021/06/01