Adding pevent_field_cmp function to compare 2 fields data,
the interface is:
int pevent_field_cmp(struct format_field *a_field,
struct format_field *b_field,
void *a_data, int a_size,
void *b_data, int b_size);
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: David Ahern <dsah...@gmail.com>
---
tools/lib/traceevent/event-parse.c | 54 ++++++++++++++++++++++++++++++++++++++
tools/lib/traceevent/event-parse.h | 5 ++++
2 files changed, 59 insertions(+)
diff --git a/tools/lib/traceevent/event-parse.c
b/tools/lib/traceevent/event-parse.c
index 7b5b2dc..aa58c26 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -4026,6 +4026,60 @@ static int is_printable_array(char *p, unsigned int len)
return 1;
}
+int pevent_field_cmp(struct format_field *a_field,
+ struct format_field *b_field,
+ void *a_data, int a_size,
+ void *b_data, int b_size)
+{
+ struct event_format *a_event = a_field->event;
+ struct event_format *b_event = a_field->event;
+ unsigned int a_offset, b_offset, a_len, b_len, i;
+ unsigned long long a_val = 0, b_val = 0;
+
+ if (a_size != b_size)
+ return a_size - b_size;
+
+ if (a_field->flags & FIELD_IS_ARRAY) {
+ a_offset = a_field->offset;
+ b_offset = b_field->offset;
+ a_len = a_field->size;
+ b_len = b_field->size;
+
+ if (a_field->flags & FIELD_IS_DYNAMIC) {
+ a_offset = pevent_read_number(a_event->pevent,
+ a_data + a_offset,
+ a_len);
+ a_len = a_offset >> 16;
+ a_offset &= 0xffff;
+ }
+
+ if (b_field->flags & FIELD_IS_DYNAMIC) {
+ b_offset = pevent_read_number(b_event->pevent,
+ b_data + b_offset,
+ b_len);
+ b_len = b_offset >> 16;
+ b_offset &= 0xffff;
+ }
+
+ if (a_len != b_len)
+ return a_len - b_len;
+
+ for (i = 0; (i < a_len) && (a_val == b_val); i++) {
+ a_val = *((unsigned char *)a_data + a_offset + i);
+ b_val = *((unsigned char *)b_data + b_offset + i);
+ }
+ } else {
+ a_val = pevent_read_number(a_event->pevent,
+ a_data + a_field->offset,
+ a_field->size);
+ b_val = pevent_read_number(b_event->pevent,
+ b_data + b_field->offset,
+ b_field->size);
+ }
+
+ return a_val - b_val;
+}
+
void pevent_field_info(struct trace_seq *s,
struct format_field *field,
void *data, int size __maybe_unused,
diff --git a/tools/lib/traceevent/event-parse.h
b/tools/lib/traceevent/event-parse.h
index b49fad1..7158b55 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -588,6 +588,11 @@ int pevent_pid_is_registered(struct pevent *pevent, int
pid);
void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
struct pevent_record *record, bool use_trace_clock);
+int pevent_field_cmp(struct format_field *a_field,
+ struct format_field *b_field,
+ void *a_data, int a_size,
+ void *b_data, int b_size);
+
void pevent_field_info(struct trace_seq *s,
struct format_field *field,
void *data, int size __maybe_unused,
--
1.8.3.1
--
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