From: "Yordan Karadzhov (VMware)" <y.karadz@gmail.com>
To: rostedt@goodmis.org
Cc: linux-trace-devel@vger.kernel.org,
"Yordan Karadzhov (VMware)" <y.karadz@gmail.com>
Subject: [PATCH v4 5/5] libtraceevent: Add tep_print_selected_fields()
Date: Tue, 10 Aug 2021 15:26:59 +0300 [thread overview]
Message-ID: <20210810122659.145759-6-y.karadz@gmail.com> (raw)
In-Reply-To: <20210810122659.145759-1-y.karadz@gmail.com>
The new method can print only a subset of the unique data fields of
the trace event. The print format is derived from the parsing tokens
(tep_print_parse objects) of the event.
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
---
src/event-parse.c | 18 ++++++++++++++----
src/event-parse.h | 3 +++
2 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/src/event-parse.c b/src/event-parse.c
index c7043ec..bc03daf 100644
--- a/src/event-parse.c
+++ b/src/event-parse.c
@@ -5453,20 +5453,30 @@ void tep_print_field(struct trace_seq *s, void *data,
_tep_print_field(s, data, field, NULL);
}
-void tep_print_fields(struct trace_seq *s, void *data,
- int size __maybe_unused, struct tep_event *event)
+void tep_print_selected_fields(struct trace_seq *s, void *data,
+ struct tep_event *event,
+ int ignore_mask)
{
struct tep_print_parse *parse = event->print_fmt.print_cache;
struct tep_format_field *field;
+ int field_mask = 1;
field = event->format.fields;
- while (field) {
+ for (;field; field = field->next, field_mask *= 2) {
+ if (field_mask & ignore_mask)
+ continue;
+
trace_seq_printf(s, " %s=", field->name);
_tep_print_field(s, data, field, &parse);
- field = field->next;
}
}
+void tep_print_fields(struct trace_seq *s, void *data,
+ int size __maybe_unused, struct tep_event *event)
+{
+ tep_print_selected_fields(s, data, event, 0);
+}
+
static int print_function(struct trace_seq *s, const char *format,
void *data, int size, struct tep_event *event,
struct tep_print_arg *arg)
diff --git a/src/event-parse.h b/src/event-parse.h
index d4a876f..c8f3251 100644
--- a/src/event-parse.h
+++ b/src/event-parse.h
@@ -545,6 +545,9 @@ int tep_cmdline_pid(struct tep_handle *tep, struct tep_cmdline *cmdline);
void tep_print_field(struct trace_seq *s, void *data,
struct tep_format_field *field);
+void tep_print_selected_fields(struct trace_seq *s, void *data,
+ struct tep_event *event,
+ int ignore_mask);
void tep_print_fields(struct trace_seq *s, void *data,
int size __maybe_unused, struct tep_event *event);
int tep_strerror(struct tep_handle *tep, enum tep_errno errnum,
--
2.30.2
prev parent reply other threads:[~2021-08-10 12:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-10 12:26 [PATCH v4 0/5] libtraceevent: Optimize the print of tep fields Yordan Karadzhov (VMware)
2021-08-10 12:26 ` [PATCH v4 1/5] libtraceevent: Add dynamic_offset() Yordan Karadzhov (VMware)
2021-08-10 12:26 ` [PATCH v4 2/5] libtraceevent: Have all field args point to the field they represent Yordan Karadzhov (VMware)
2021-08-10 12:26 ` [PATCH v4 3/5] libtraceevent: Improve tep_print_field() Yordan Karadzhov (VMware)
2021-08-10 12:26 ` [PATCH v4 4/5] libtraceevent: Optimize tep_print_fields() Yordan Karadzhov (VMware)
2021-08-10 12:26 ` Yordan Karadzhov (VMware) [this message]
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