[PATCH v4 1/4] Add new elements for per-event-dump option

[yuzhoujian]

This patch will add two elements for perf_tool struct: per_event_dump
is used to mark the per-event-dump option, last_evsel_name is used
to save last evsel's name. Add a new struct perf_script_evsel to
save evsel's specific data. There are three elements in this new struct:
dump_evsel_fp is used to save the file pointer of the dump_event file,
filename is used to save the file name of the dump_event file, samples
is used to save the number of samples for each evsel. The perf_script_evsel
struct will be saved in the evsel->priv. Add the OPT_BOOLEAN for per-event-dump
in the perf_data_file struct.

Changes since v3:
- remove three elements for perf_evsel struct and create a new struct:
 perf_script_evsel to save them.

Changes since v2:
- add the last_evsel_name for per_tool struct to save last evsel's name.
- add three elements for perf_evsel struct:dump_event_fp is used to save
 the file pointer of the dump_event file, filename is used to save the file
 name of the dump_event file, samples is used to save the number of samples
 for each evsel.

Changes since v1:
- remove the set for script.tool.per_event_dump variable,since the OPT_BOOLEAN
 will do the same thing.

Signed-off-by: yuzhoujian <yuzhoujian@xxxxxxxxxxxxxxx>
---
 tools/perf/builtin-script.c |  3 +++
 tools/perf/util/evsel.h     | 12 ++++++++++++
 tools/perf/util/tool.h      |  2 ++
 3 files changed, 17 insertions(+)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 7167df2..4ffa716 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -2729,6 +2729,7 @@ int cmd_script(int argc, const char **argv)
 			.cpu_map	 = process_cpu_map_event,
 			.ordered_events	 = true,
 			.ordering_requires_timestamps = true,
+			.per_event_dump = false,
 		},
 	};
 	struct perf_data_file file = {
@@ -2799,6 +2800,8 @@ int cmd_script(int argc, const char **argv)
 		    "Show context switch events (if recorded)"),
 	OPT_BOOLEAN('\0', "show-namespace-events", &script.show_namespace_events,
 		    "Show namespace events (if recorded)"),
+	OPT_BOOLEAN('\0', "per-event-dump", &script.tool.per_event_dump,
+		    "print trace output to files named by the monitored events"),
 	OPT_BOOLEAN('f', "force", &symbol_conf.force, "don't complain, do it"),
 	OPT_INTEGER(0, "max-blocks", &max_blocks,
 		    "Maximum number of code blocks to dump with brstackinsn"),
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index db65878..2ab0650 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -4,6 +4,7 @@
 #include <linux/list.h>
 #include <stdbool.h>
 #include <stddef.h>
+#include <stdio.h>
 #include <linux/perf_event.h>
 #include <linux/types.h>
 #include "xyarray.h"
@@ -51,6 +52,17 @@ enum {
 	PERF_EVSEL__CONFIG_TERM_MAX,
 };
 
+/**
+ * The struct perf_script_evsel is used to save the dump file's name,
+ * dump_evsel_fp and the total number of samples for each evsel when
+ * the per-event-dump option is set.
+ */
+struct perf_script_evsel {
+	char			*filename;
+	FILE			*dump_evsel_fp;
+	unsigned long		samples;
+};
+
 struct perf_evsel_config_term {
 	struct list_head	list;
 	int	type;
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index d549e50..2cbcee4 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -75,6 +75,8 @@ struct perf_tool {
 	bool		ordered_events;
 	bool		ordering_requires_timestamps;
 	bool		namespace_events;
+	bool		per_event_dump;
+	const char	*last_evsel_name;
 	enum show_feature_header show_feat_hdr;
 };
 
-- 
1.8.3.1