[tip:perf/core] perf top: Support call-graph display options also

[tip-bot for Namhyung Kim <tipbot@zytor.com>]

Commit-ID:  a2c10d39af49b00514f7cc7b750757fcc2174f0c
Gitweb:     http://git.kernel.org/tip/a2c10d39af49b00514f7cc7b750757fcc2174f0c
Author:     Namhyung Kim <namhyung@kernel.org>
AuthorDate: Thu, 22 Oct 2015 15:28:49 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 22 Oct 2015 15:40:02 -0300

perf top: Support call-graph display options also

Currently 'perf top --call-graph' option is same as 'perf record'.  But
'perf top' also need to receive display options in 'perf report'.  To do
that, change parse_callchain_report_opt() to allow record options too.

Now perf top can receive display options like below:

  $ perf top --call-graph
    Error: option `call-graph' requires a value

   Usage: perf top [<options>]

        --call-graph
          <mode[,dump_size],output_type,min_percent[,print_limit],call_order[,branch]>
                     setup and enables call-graph (stack chain/backtrace)
                     recording: fp dwarf lbr, output_type (graph, flat,
		     fractal, or none), min percent threshold, optional
		     print limit, callchain order, key (function or
		     address), add branches

  $ perf top --call-graph callee,graph,fp

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Chandler Carruth <chandlerc@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1445495330-25416-2-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/Documentation/perf-top.txt |  5 +++--
 tools/perf/builtin-top.c              | 26 ++++++++++++++++++-----
 tools/perf/util/callchain.c           | 40 ++++++++++++++++++++++++++++++++---
 tools/perf/util/callchain.h           |  1 +
 4 files changed, 62 insertions(+), 10 deletions(-)

diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index f6a23eb..556cec0 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -160,9 +160,10 @@ Default is to monitor all CPUS.
 -g::
 	Enables call-graph (stack chain/backtrace) recording.
 
---call-graph::
+--call-graph [mode,type,min[,limit],order[,key][,branch]]::
 	Setup and enable call-graph (stack chain/backtrace) recording,
-	implies -g.
+	implies -g.  See `--call-graph` section in perf-record and
+	perf-report man pages for details.
 
 --children::
 	Accumulate callchain of children to parent entry so that then can
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 6f641fd..1de381d 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1053,8 +1053,22 @@ callchain_opt(const struct option *opt, const char *arg, int unset)
 static int
 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
 {
-	symbol_conf.use_callchain = true;
-	return record_parse_callchain_opt(opt, arg, unset);
+	struct record_opts *record = (struct record_opts *)opt->value;
+
+	record->callgraph_set = true;
+	callchain_param.enabled = !unset;
+	callchain_param.record_mode = CALLCHAIN_FP;
+
+	/*
+	 * --no-call-graph
+	 */
+	if (unset) {
+		symbol_conf.use_callchain = false;
+		callchain_param.record_mode = CALLCHAIN_NONE;
+		return 0;
+	}
+
+	return parse_callchain_top_opt(arg);
 }
 
 static int perf_top_config(const char *var, const char *value, void *cb)
@@ -1079,6 +1093,8 @@ parse_percent_limit(const struct option *opt, const char *arg,
 	return 0;
 }
 
+const char top_callchain_help[] = CALLCHAIN_RECORD_HELP ", " CALLCHAIN_REPORT_HELP;
+
 int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	char errbuf[BUFSIZ];
@@ -1154,11 +1170,11 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
 		    "Show a column with the number of samples"),
 	OPT_CALLBACK_NOOPT('g', NULL, &top.record_opts,
-			   NULL, "enables call-graph recording",
+			   NULL, "enables call-graph recording and display",
 			   &callchain_opt),
 	OPT_CALLBACK(0, "call-graph", &top.record_opts,
-		     "mode[,dump_size]", record_callchain_help,
-		     &parse_callchain_opt),
+		     "mode[,dump_size],output_type,min_percent[,print_limit],call_order[,branch]",
+		     top_callchain_help, &parse_callchain_opt),
 	OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
 		    "Accumulate callchains of children and show total overhead as well"),
 	OPT_INTEGER(0, "max-stack", &top.max_stack,
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 773fe13..842be32 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -77,12 +77,14 @@ static int parse_callchain_sort_key(const char *value)
 	return -1;
 }
 
-int
-parse_callchain_report_opt(const char *arg)
+static int
+__parse_callchain_report_opt(const char *arg, bool allow_record_opt)
 {
 	char *tok;
 	char *endptr;
 	bool minpcnt_set = false;
+	bool record_opt_set = false;
+	bool try_stack_size = false;
 
 	symbol_conf.use_callchain = true;
 
@@ -100,6 +102,28 @@ parse_callchain_report_opt(const char *arg)
 		    !parse_callchain_order(tok) ||
 		    !parse_callchain_sort_key(tok)) {
 			/* parsing ok - move on to the next */
+			try_stack_size = false;
+			goto next;
+		} else if (allow_record_opt && !record_opt_set) {
+			if (parse_callchain_record(tok, &callchain_param))
+				goto try_numbers;
+
+			/* assume that number followed by 'dwarf' is stack size */
+			if (callchain_param.record_mode == CALLCHAIN_DWARF)
+				try_stack_size = true;
+
+			record_opt_set = true;
+			goto next;
+		}
+
+try_numbers:
+		if (try_stack_size) {
+			unsigned long size = 0;
+
+			if (get_stack_size(tok, &size) < 0)
+				return -1;
+			callchain_param.dump_size = size;
+			try_stack_size = false;
 		} else if (!minpcnt_set) {
 			/* try to get the min percent */
 			callchain_param.min_percent = strtod(tok, &endptr);
@@ -112,7 +136,7 @@ parse_callchain_report_opt(const char *arg)
 			if (tok == endptr)
 				return -1;
 		}
-
+next:
 		arg = NULL;
 	}
 
@@ -123,6 +147,16 @@ parse_callchain_report_opt(const char *arg)
 	return 0;
 }
 
+int parse_callchain_report_opt(const char *arg)
+{
+	return __parse_callchain_report_opt(arg, false);
+}
+
+int parse_callchain_top_opt(const char *arg)
+{
+	return __parse_callchain_report_opt(arg, true);
+}
+
 int perf_callchain_config(const char *var, const char *value)
 {
 	char *endptr;
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index c9e3a2e..836d59a 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -192,6 +192,7 @@ extern const char record_callchain_help[];
 extern int parse_callchain_record(const char *arg, struct callchain_param *param);
 int parse_callchain_record_opt(const char *arg, struct callchain_param *param);
 int parse_callchain_report_opt(const char *arg);
+int parse_callchain_top_opt(const char *arg);
 int perf_callchain_config(const char *var, const char *value);
 
 static inline void callchain_cursor_snapshot(struct callchain_cursor *dest,