linux-kernel - [RFC PATCH 2/4] perf-probe: Add offline output directory option

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Date:   Wed, 24 Aug 2016 14:58:12 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>
Subject: [RFC PATCH 2/4] perf-probe: Add offline output directory option

Add offline output direcrtory option. This allows user to
store probe event definition in offline output directory.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 tools/perf/builtin-probe.c    |    2 ++
 tools/perf/util/probe-event.h |    1 +
 tools/perf/util/probe-file.c  |   19 ++++++++++++++++---
 3 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index ee5b421..5b45ec8 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -517,6 +517,8 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
 		"Show variables location range in scope (with --vars only)"),
 	OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
 		   "file", "vmlinux pathname"),
+	OPT_STRING(0, "outdir", &probe_conf.output_dir,
+		"directory", "path to offline output directory"),
 	OPT_STRING('s', "source", &symbol_conf.source_prefix,
 		   "directory", "path to kernel source"),
 	OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index f4f45db..75b572a 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -14,6 +14,7 @@ struct probe_conf {
 	bool	no_inlines;
 	bool	cache;
 	int	max_probes;
+	const char	*output_dir;
 };
 extern struct probe_conf probe_conf;
 extern bool probe_event_dry_run;
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 6f931e4..41db430 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -73,16 +73,25 @@ static void print_both_open_warning(int kerr, int uerr)
 static int open_probe_events(const char *trace_file, bool readwrite)
 {
 	char buf[PATH_MAX];
+	const char *tracing_dir = tracing_path;
+	int oflag = 0;
+	mode_t mode = 0;
 	int ret;
 
+	if (probe_conf.output_dir) {
+		tracing_dir = probe_conf.output_dir;
+		oflag = O_CREAT;
+		mode = 0644;
+	}
+
 	ret = e_snprintf(buf, PATH_MAX, "%s/%s",
-			 tracing_path, trace_file);
+			 tracing_dir, trace_file);
 	if (ret >= 0) {
 		pr_debug("Opening %s write=%d\n", buf, readwrite);
 		if (readwrite && !probe_event_dry_run)
-			ret = open(buf, O_RDWR | O_APPEND, 0);
+			ret = open(buf, O_RDWR | O_APPEND | oflag, mode);
 		else
-			ret = open(buf, O_RDONLY, 0);
+			ret = open(buf, O_RDONLY | oflag, mode);
 
 		if (ret < 0)
 			ret = -errno;
@@ -242,6 +251,8 @@ int probe_file__add_event(int fd, struct probe_trace_event *tev)
 			pr_warning("Failed to write event: %s\n",
 				   str_error_r(errno, sbuf, sizeof(sbuf)));
 		}
+		if (probe_conf.output_dir)
+			ret = write(fd, "\n", 1) == 1 ? 0 : -errno;
 	}
 	free(buf);
 
@@ -274,6 +285,8 @@ static int __del_trace_probe_event(int fd, struct str_node *ent)
 		ret = -errno;
 		goto error;
 	}
+	if (probe_conf.output_dir)
+		ret = write(fd, "\n", 1) == 1 ? 0 : -errno;
 
 	return 0;
 error: