[tip:perf/core] perf c2c: Add record subcommand

[tip-bot for Jiri Olsa <tipbot@zytor.com>]

Commit-ID:  39bcd4a4e4cbd0ce41a6be848aec335646de1919
Gitweb:     http://git.kernel.org/tip/39bcd4a4e4cbd0ce41a6be848aec335646de1919
Author:     Jiri Olsa <jolsa@kernel.org>
AuthorDate: Thu, 22 Sep 2016 17:36:39 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 19 Oct 2016 13:18:31 -0300

perf c2c: Add record subcommand

Adding c2c record subcommand. It setups options related to HITM
cacheline analysis and calls standard perf record command.

  $ sudo perf c2c record -v -- -a
  calling: record -W -d --sample-cpu -e cpu/mem-loads,ldlat=30/P -e cpu/mem-stores/P -a
  ...

It produces perf.data, which is to be reported by perf c2c report, that
comes in following patches.

Details are described in the man page, which is added in one of the
following patches.

Committer notes:

Testing it:

  # perf c2c record -a sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 5.050 MB perf.data (412 samples) ]
  # ls -la perf.data
  -rw-------. 1 root root 5301752 Oct  4 13:32 perf.data
  # perf evlist
  cpu/mem-loads,ldlat=30/P
  cpu/mem-stores/P
  # perf evlist -v
  cpu/mem-loads,ldlat=30/P: type: 4, size: 112, config: 0x1cd, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ADDR|ID|CPU|PERIOD|DATA_SRC|WEIGHT, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1, precise_ip: 3, mmap_data: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1, { bp_addr, config1 }: 0x1f
  cpu/mem-stores/P: type: 4, size: 112, config: 0x82d0, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ADDR|ID|CPU|PERIOD|DATA_SRC|WEIGHT, read_format: ID, disabled: 1, inherit: 1, freq: 1, precise_ip: 3, sample_id_all: 1
  #
  # perf report --stdio
  <SNIP>
  # Total Lost Samples: 14
  # Samples: 216  of event 'cpu/mem-loads,ldlat=30/P'
  # Event count (approx.): 15207
  # Overhead  Symbol                                 Shared Object
  # ........  .....................................  ............................
      10.32%  [k] update_blocked_averages            [kernel.vmlinux]
       3.43%  [.] 0x00000000001a2122                 qemu-system-x86_64 (deleted)
       2.52%  [k] enqueue_entity                     [kernel.vmlinux]
       1.88%  [.] g_main_context_query               libglib-2.0.so.0.4800.2
       1.86%  [k] __schedule                         [kernel.vmlinux]
  <SNIP>
  # Samples: 196  of event 'cpu/mem-stores/P'
  # Event count (approx.): 14771346
  # Overhead  Symbol                               Shared Object
  # ........  ...................................  ............................
      13.91%  [k] intel_idle                       [kernel.vmlinux]
       3.02%  [.] 0x00000000022f06ea               chrome
       2.94%  [.] 0x00000000001a1b4c               qemu-system-x86_64 (deleted)
       2.94%  [.] 0x000000000019d8e4               qemu-system-x86_64 (deleted)
       2.38%  [.] 0x00000000001a1c52               qemu-system-x86_64 (deleted)
  <SNIP>

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1474558645-19956-12-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-c2c.c | 114 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 8252ed0..58924c6 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -4,12 +4,116 @@
 #include "debug.h"
 #include "builtin.h"
 #include <subcmd/parse-options.h>
+#include "mem-events.h"
 
 static const char * const c2c_usage[] = {
 	"perf c2c",
 	NULL
 };
 
+static int parse_record_events(const struct option *opt __maybe_unused,
+			       const char *str, int unset __maybe_unused)
+{
+	bool *event_set = (bool *) opt->value;
+
+	*event_set = true;
+	return perf_mem_events__parse(str);
+}
+
+
+static const char * const __usage_record[] = {
+	"perf c2c record [<options>] [<command>]",
+	"perf c2c record [<options>] -- <command> [<options>]",
+	NULL
+};
+
+static const char * const *record_mem_usage = __usage_record;
+
+static int perf_c2c__record(int argc, const char **argv)
+{
+	int rec_argc, i = 0, j;
+	const char **rec_argv;
+	int ret;
+	bool all_user = false, all_kernel = false;
+	bool event_set = false;
+	struct option options[] = {
+	OPT_CALLBACK('e', "event", &event_set, "event",
+		     "event selector. Use 'perf mem record -e list' to list available events",
+		     parse_record_events),
+	OPT_INCR('v', "verbose", &verbose,
+		 "be more verbose (show counter open errors, etc)"),
+	OPT_BOOLEAN('u', "all-user", &all_user, "collect only user level data"),
+	OPT_BOOLEAN('k', "all-kernel", &all_kernel, "collect only kernel level data"),
+	OPT_UINTEGER('l', "ldlat", &perf_mem_events__loads_ldlat, "setup mem-loads latency"),
+	OPT_END()
+	};
+
+	if (perf_mem_events__init()) {
+		pr_err("failed: memory events not supported\n");
+		return -1;
+	}
+
+	argc = parse_options(argc, argv, options, record_mem_usage,
+			     PARSE_OPT_KEEP_UNKNOWN);
+
+	rec_argc = argc + 10; /* max number of arguments */
+	rec_argv = calloc(rec_argc + 1, sizeof(char *));
+	if (!rec_argv)
+		return -1;
+
+	rec_argv[i++] = "record";
+
+	if (!event_set) {
+		perf_mem_events[PERF_MEM_EVENTS__LOAD].record  = true;
+		perf_mem_events[PERF_MEM_EVENTS__STORE].record = true;
+	}
+
+	if (perf_mem_events[PERF_MEM_EVENTS__LOAD].record)
+		rec_argv[i++] = "-W";
+
+	rec_argv[i++] = "-d";
+	rec_argv[i++] = "--sample-cpu";
+
+	for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
+		if (!perf_mem_events[j].record)
+			continue;
+
+		if (!perf_mem_events[j].supported) {
+			pr_err("failed: event '%s' not supported\n",
+			       perf_mem_events[j].name);
+			return -1;
+		}
+
+		rec_argv[i++] = "-e";
+		rec_argv[i++] = perf_mem_events__name(j);
+	};
+
+	if (all_user)
+		rec_argv[i++] = "--all-user";
+
+	if (all_kernel)
+		rec_argv[i++] = "--all-kernel";
+
+	for (j = 0; j < argc; j++, i++)
+		rec_argv[i] = argv[j];
+
+	if (verbose > 0) {
+		pr_debug("calling: ");
+
+		j = 0;
+
+		while (rec_argv[j]) {
+			pr_debug("%s ", rec_argv[j]);
+			j++;
+		}
+		pr_debug("\n");
+	}
+
+	ret = cmd_record(i, rec_argv, NULL);
+	free(rec_argv);
+	return ret;
+}
+
 int cmd_c2c(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	const struct option c2c_options[] = {
@@ -19,5 +123,15 @@ int cmd_c2c(int argc, const char **argv, const char *prefix __maybe_unused)
 
 	argc = parse_options(argc, argv, c2c_options, c2c_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (!argc)
+		usage_with_options(c2c_usage, c2c_options);
+
+	if (!strncmp(argv[0], "rec", 3)) {
+		return perf_c2c__record(argc, argv);
+	} else {
+		usage_with_options(c2c_usage, c2c_options);
+	}
+
 	return 0;
 }