Date:   Tue, 4 Jan 2022 15:21:27 +0100
From:   Jiri Olsa <jolsa@redhat.com>
To:     Ian Rogers <irogers@google.com>
Cc:     Andi Kleen <ak@linux.intel.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,
        eranian@google.com
Subject: Re: [PATCH v3] perf evlist: Remove group option.
Message-ID: <YdRX5zgB3AORM/Wd@krava>
References: <20211230072030.302559-1-irogers@google.com>
 <20211230072030.302559-3-irogers@google.com>
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On Wed, Dec 29, 2021 at 11:19:43PM -0800, Ian Rogers wrote:
> 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>

it should not be part of this patchset right?
I see it was posted separately

jirka

> ---
>  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
>