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trace: add trace_event_iter_init_group 

This allows to interate over an event group.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20210601132414.432430-4-kraxel@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Gerd Hoffmann 2021-06-01 15:24:04 +02:00 committed by Stefan Hajnoczi
parent 117856c374
commit c5cc58b176
2 changed files with 29 additions and 3 deletions
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19
trace/control.c
View File

@ -104,6 +104,7 @@ void trace_event_iter_init_all(TraceEventIter *iter)
{ {
iter->event = 0; iter->event = 0;
iter->group = 0; iter->group = 0;
iter->group_id = -1;
iter->pattern = NULL; iter->pattern = NULL;
} }
@ -113,20 +114,32 @@ void trace_event_iter_init_pattern(TraceEventIter *iter, const char *pattern)
iter->pattern = 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) TraceEvent *trace_event_iter_next(TraceEventIter *iter)
{ {
while (iter->group < nevent_groups && while (iter->group < nevent_groups &&
event_groups[iter->group].events[iter->event] != NULL) { event_groups[iter->group].events[iter->event] != NULL) {
TraceEvent *ev = event_groups[iter->group].events[iter->event]; TraceEvent *ev = event_groups[iter->group].events[iter->event];
size_t group = iter->group;
iter->event++; iter->event++;
if (event_groups[iter->group].events[iter->event] == NULL) { if (event_groups[iter->group].events[iter->event] == NULL) {
iter->event = 0; iter->event = 0;
iter->group++; iter->group++;
} }
if (!iter->pattern || if (iter->pattern &&
g_pattern_match_simple(iter->pattern, trace_event_get_name(ev))) { !g_pattern_match_simple(iter->pattern, trace_event_get_name(ev))) {
return ev; continue;
} }
if (iter->group_id != -1 &&
iter->group_id != group) {
continue;
}
return ev;
} }
return NULL; return NULL;

13
trace/control.h
View File

@ -13,8 +13,11 @@
#include "event-internal.h" #include "event-internal.h"
typedef struct TraceEventIter { typedef struct TraceEventIter {
/* iter state */
size_t event; size_t event;
size_t group; size_t group;
/* filter conditions */
size_t group_id;
const char *pattern; const char *pattern;
} TraceEventIter; } TraceEventIter;
@ -39,6 +42,16 @@ void trace_event_iter_init_all(TraceEventIter *iter);
*/ */
void trace_event_iter_init_pattern(TraceEventIter *iter, const char *pattern); 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: * trace_event_iter_next:
* @iter: the event iterator struct * @iter: the event iterator struct