Date:   Wed, 29 Dec 2021 23:19:43 -0800
In-Reply-To: <20211230072030.302559-1-irogers@google.com>
Message-Id: <20211230072030.302559-3-irogers@google.com>
Mime-Version: 1.0
References: <20211230072030.302559-1-irogers@google.com>
Subject: [PATCH v3] perf evlist: Remove group option.
From:   Ian Rogers <irogers@google.com>
To:     Andi Kleen <ak@linux.intel.com>, Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@kernel.org>,
        John Garry <john.garry@huawei.com>,
        Kajol Jain <kjain@linux.ibm.com>,
        "Paul A . Clarke" <pc@us.ibm.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Riccardo Mancini <rickyman7@gmail.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
        Vineet Singh <vineet.singh@intel.com>,
        James Clark <james.clark@arm.com>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Mike Leach <mike.leach@linaro.org>,
        Leo Yan <leo.yan@linaro.org>, coresight@lists.linaro.org,
        linux-arm-kernel@lists.infradead.org, zhengjun.xing@intel.com
Cc:     eranian@google.com, Ian Rogers <irogers@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

The group option predates grouping events using curly braces added in
commit 89efb029502d ("perf tools: Add support to parse event group syntax")
The --group option was retained for legacy support (in August 2012) but
keeping it adds complexity.

v2 and v3. were rebases.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/Documentation/perf-record.txt |  4 ----
 tools/perf/Documentation/perf-top.txt    |  7 ++-----
 tools/perf/builtin-record.c              |  2 --
 tools/perf/builtin-stat.c                |  6 ------
 tools/perf/builtin-top.c                 |  2 --
 tools/perf/tests/attr/README             |  2 --
 tools/perf/tests/attr/test-record-group  | 22 ----------------------
 tools/perf/tests/attr/test-stat-group    | 17 -----------------
 tools/perf/util/evlist.c                 |  2 +-
 tools/perf/util/evlist.h                 |  2 --
 tools/perf/util/python.c                 |  8 --------
 tools/perf/util/record.c                 |  7 -------
 tools/perf/util/record.h                 |  1 -
 13 files changed, 3 insertions(+), 79 deletions(-)
 delete mode 100644 tools/perf/tests/attr/test-record-group
 delete mode 100644 tools/perf/tests/attr/test-stat-group

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 55df7b073a55..960fb1ad3f27 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -238,10 +238,6 @@ OPTIONS
 	Also, by adding a comma, the number of mmap pages for AUX
 	area tracing can be specified.
 
---group::
-	Put all events in a single event group.  This precedes the --event
-	option and remains only for backward compatibility.  See --event.
-
 -g::
 	Enables call-graph (stack chain/backtrace) recording for both
 	kernel space and user space.
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index cac3dfbee7d8..acbafe777e52 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -51,9 +51,6 @@ Default is to monitor all CPUS.
 --count-filter=<count>::
 	Only display functions with more events than this.
 
---group::
-        Put the counters into a counter group.
-
 --group-sort-idx::
 	Sort the output by the event at the index n in group. If n is invalid,
 	sort by the first event. It can support multiple groups with different
@@ -313,10 +310,10 @@ use '-e e1 -e e2 -G foo,foo' or just use '-e e1 -e e2 -G foo'.
 
 		perf top -e cycles,probe:icmp_rcv --switch-on=probe:icmp_rcv
 
-	   Alternatively one can ask for --group and then two overhead columns
+	   Alternatively one can ask for a group and then two overhead columns
            will appear, the first for cycles and the second for the switch-on event.
 
-		perf top --group -e cycles,probe:icmp_rcv --switch-on=probe:icmp_rcv
+		perf top -e '{cycles,probe:icmp_rcv}' --switch-on=probe:icmp_rcv
 
 	This may be interesting to measure a workload only after some initialization
 	phase is over, i.e. insert a perf probe at that point and use the above
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 6ac2160913ea..54eff61f78eb 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -2521,8 +2521,6 @@ static struct option __record_options[] = {
 	OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
 		     "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
 		     record__mmap_flush_parse),
-	OPT_BOOLEAN(0, "group", &record.opts.group,
-		    "put the counters into a counter group"),
 	OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
 			   NULL, "enables call-graph recording" ,
 			   &record_callchain_opt),
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index f6ca2b054c5b..8ce4ca6111ae 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -180,7 +180,6 @@ static bool			topdown_run			= false;
 static bool			smi_cost			= false;
 static bool			smi_reset			= false;
 static int			big_num_opt			=  -1;
-static bool			group				= false;
 static const char		*pre_cmd			= NULL;
 static const char		*post_cmd			= NULL;
 static bool			sync_run			= false;
@@ -800,9 +799,6 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
 		child_pid = evsel_list->workload.pid;
 	}
 
-	if (group)
-		evlist__set_leader(evsel_list);
-
 	if (affinity__setup(&affinity) < 0)
 		return -1;
 
@@ -1212,8 +1208,6 @@ static struct option stat_options[] = {
 #endif
 	OPT_BOOLEAN('a', "all-cpus", &target.system_wide,
 		    "system-wide collection from all CPUs"),
-	OPT_BOOLEAN('g', "group", &group,
-		    "put the counters into a counter group"),
 	OPT_BOOLEAN(0, "scale", &stat_config.scale,
 		    "Use --no-scale to disable counter scaling for multiplexing"),
 	OPT_INCR('v', "verbose", &verbose,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 1fc390f136dd..0d8441942f34 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1472,8 +1472,6 @@ int cmd_top(int argc, const char **argv)
 			    "dump the symbol table used for profiling"),
 	OPT_INTEGER('f', "count-filter", &top.count_filter,
 		    "only display functions with more events than this"),
-	OPT_BOOLEAN(0, "group", &opts->group,
-			    "put the counters into a counter group"),
 	OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
 		    "child tasks do not inherit counters"),
 	OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
diff --git a/tools/perf/tests/attr/README b/tools/perf/tests/attr/README
index a36f49fb4dbe..f538272af57b 100644
--- a/tools/perf/tests/attr/README
+++ b/tools/perf/tests/attr/README
@@ -47,7 +47,6 @@ Following tests are defined (with perf commands):
   perf record -g kill                           (test-record-graph-default)
   perf record --call-graph dwarf kill		(test-record-graph-dwarf)
   perf record --call-graph fp kill              (test-record-graph-fp)
-  perf record --group -e cycles,instructions kill (test-record-group)
   perf record -e '{cycles,instructions}' kill   (test-record-group1)
   perf record -e '{cycles/period=1/,instructions/period=2/}:S' kill (test-record-group2)
   perf record -D kill                           (test-record-no-delay)
@@ -61,6 +60,5 @@ Following tests are defined (with perf commands):
   perf stat -d kill                             (test-stat-detailed-1)
   perf stat -dd kill                            (test-stat-detailed-2)
   perf stat -ddd kill                           (test-stat-detailed-3)
-  perf stat --group -e cycles,instructions kill (test-stat-group)
   perf stat -e '{cycles,instructions}' kill     (test-stat-group1)
   perf stat -i -e cycles kill                   (test-stat-no-inherit)
diff --git a/tools/perf/tests/attr/test-record-group b/tools/perf/tests/attr/test-record-group
deleted file mode 100644
index 14ee60fd3f41..000000000000
--- a/tools/perf/tests/attr/test-record-group
+++ /dev/null
@@ -1,22 +0,0 @@
-[config]
-command = record
-args    = --no-bpf-event --group -e cycles,instructions kill >/dev/null 2>&1
-ret     = 1
-
-[event-1:base-record]
-fd=1
-group_fd=-1
-sample_type=327
-read_format=4
-
-[event-2:base-record]
-fd=2
-group_fd=1
-config=1
-sample_type=327
-read_format=4
-mmap=0
-comm=0
-task=0
-enable_on_exec=0
-disabled=0
diff --git a/tools/perf/tests/attr/test-stat-group b/tools/perf/tests/attr/test-stat-group
deleted file mode 100644
index e15d6946e9b3..000000000000
--- a/tools/perf/tests/attr/test-stat-group
+++ /dev/null
@@ -1,17 +0,0 @@
-[config]
-command = stat
-args    = --group -e cycles,instructions kill >/dev/null 2>&1
-ret     = 1
-
-[event-1:base-stat]
-fd=1
-group_fd=-1
-read_format=3|15
-
-[event-2:base-stat]
-fd=2
-group_fd=1
-config=1
-disabled=0
-enable_on_exec=0
-read_format=3|15
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 5f92319ce258..2e11d82d15e0 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -224,7 +224,7 @@ int __evlist__set_tracepoints_handlers(struct evlist *evlist,
 	return err;
 }
 
-void evlist__set_leader(struct evlist *evlist)
+static void evlist__set_leader(struct evlist *evlist)
 {
 	perf_evlist__set_leader(&evlist->core);
 }
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 27594900a052..ebab48a8120f 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -203,8 +203,6 @@ void evlist__set_selected(struct evlist *evlist, struct evsel *evsel);
 int evlist__create_maps(struct evlist *evlist, struct target *target);
 int evlist__apply_filters(struct evlist *evlist, struct evsel **err_evsel);
 
-void evlist__set_leader(struct evlist *evlist);
-
 u64 __evlist__combined_sample_type(struct evlist *evlist);
 u64 evlist__combined_sample_type(struct evlist *evlist);
 u64 evlist__combined_branch_type(struct evlist *evlist);
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 7f782a31bda3..d063375c346a 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -1121,14 +1121,6 @@ static PyObject *pyrf_evlist__open(struct pyrf_evlist *pevlist,
 				   PyObject *args, PyObject *kwargs)
 {
 	struct evlist *evlist = &pevlist->evlist;
-	int group = 0;
-	static char *kwlist[] = { "group", NULL };
-
-	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOii", kwlist, &group))
-		return NULL;
-
-	if (group)
-		evlist__set_leader(evlist);
 
 	if (evlist__open(evlist) < 0) {
 		PyErr_SetFromErrno(PyExc_OSError);
diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
index bff669b615ee..9e694db7c7ee 100644
--- a/tools/perf/util/record.c
+++ b/tools/perf/util/record.c
@@ -99,13 +99,6 @@ void evlist__config(struct evlist *evlist, struct record_opts *opts, struct call
 	bool use_comm_exec;
 	bool sample_id = opts->sample_id;
 
-	/*
-	 * Set the evsel leader links before we configure attributes,
-	 * since some might depend on this info.
-	 */
-	if (opts->group)
-		evlist__set_leader(evlist);
-
 	if (evlist->core.cpus->map[0] < 0)
 		opts->no_inherit = true;
 
diff --git a/tools/perf/util/record.h b/tools/perf/util/record.h
index ef6c2715fdd9..0a7a8dbbea9c 100644
--- a/tools/perf/util/record.h
+++ b/tools/perf/util/record.h
@@ -13,7 +13,6 @@ struct option;
 
 struct record_opts {
 	struct target target;
-	bool	      group;
 	bool	      inherit_stat;
 	bool	      no_buffering;
 	bool	      no_inherit;
-- 
2.34.1.307.g9b7440fafd-goog