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Date: Mon, 8 Feb 2021 16:10:11 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: kan.liang@...ux.intel.com
Cc: peterz@...radead.org, mingo@...nel.org,
linux-kernel@...r.kernel.org, tglx@...utronix.de, bp@...en8.de,
namhyung@...nel.org, jolsa@...hat.com, ak@...ux.intel.com,
yao.jin@...ux.intel.com, alexander.shishkin@...ux.intel.com,
adrian.hunter@...el.com
Subject: Re: [PATCH 43/49] perf stat: Add default hybrid events
Em Mon, Feb 08, 2021 at 07:25:40AM -0800, kan.liang@...ux.intel.com escreveu:
> From: Jin Yao <yao.jin@...ux.intel.com>
>
> Previously if '-e' is not specified in perf stat, some software events
> and hardware events are added to evlist by default.
>
> root@...pl-adl-s-2:~# ./perf stat -- ./triad_loop
>
> Performance counter stats for './triad_loop':
>
> 109.43 msec task-clock # 0.993 CPUs utilized
> 1 context-switches # 0.009 K/sec
> 0 cpu-migrations # 0.000 K/sec
> 105 page-faults # 0.960 K/sec
> 401,161,982 cycles # 3.666 GHz
> 1,601,216,357 instructions # 3.99 insn per cycle
> 200,217,751 branches # 1829.686 M/sec
> 14,555 branch-misses # 0.01% of all branches
>
> 0.110176860 seconds time elapsed
>
> Among the events, cycles, instructions, branches and branch-misses
> are hardware events.
>
> One hybrid platform, two events are created for one hardware event.
>
> core cycles,
> atom cycles,
> core instructions,
> atom instructions,
> core branches,
> atom branches,
> core branch-misses,
> atom branch-misses
>
> These events will be added to evlist in order on hybrid platform
> if '-e' is not set.
>
> Since parse_events() has been supported to create two hardware events
> for one event on hybrid platform, so we just use parse_events(evlist,
> "cycles,instructions,branches,branch-misses") to create the default
> events and add them to evlist.
>
> After:
> root@...pl-adl-s-2:~# ./perf stat -vv -- taskset -c 16 ./triad_loop
> ...
> ------------------------------------------------------------
> perf_event_attr:
> type 1
> size 120
> config 0x1
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 3
> ------------------------------------------------------------
> perf_event_attr:
> type 1
> size 120
> config 0x3
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 4
> ------------------------------------------------------------
> perf_event_attr:
> type 1
> size 120
> config 0x4
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 5
> ------------------------------------------------------------
> perf_event_attr:
> type 1
> size 120
> config 0x2
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 7
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0x400000000
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 8
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0xa00000000
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 9
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0x400000001
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 10
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0xa00000001
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 11
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0x400000004
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 12
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0xa00000004
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 13
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0x400000005
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 27954 cpu -1 group_fd -1 flags 0x8 = 14
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0xa00000005
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> ...
>
> Performance counter stats for 'taskset -c 16 ./triad_loop':
>
> 201.31 msec task-clock # 0.997 CPUs utilized
> 1 context-switches # 0.005 K/sec
> 1 cpu-migrations # 0.005 K/sec
> 166 page-faults # 0.825 K/sec
> 623,267,134 cycles # 3096.043 M/sec (0.16%)
> 603,082,383 cycles # 2995.777 M/sec (99.84%)
> 406,410,481 instructions # 2018.820 M/sec (0.16%)
> 1,604,213,375 instructions # 7968.837 M/sec (99.84%)
> 81,444,171 branches # 404.569 M/sec (0.16%)
> 200,616,430 branches # 996.550 M/sec (99.84%)
> 3,769,856 branch-misses # 18.727 M/sec (0.16%)
> 16,111 branch-misses # 0.080 M/sec (99.84%)
>
> 0.201895853 seconds time elapsed
>
> We can see two events are created for one hardware event.
> First one is core event the second one is atom event.
Can we have that (core/atom) as a prefix or in the comment area?
> One thing is, the shadow stats looks a bit different, now it's just
> 'M/sec'.
>
> The perf_stat__update_shadow_stats and perf_stat__print_shadow_stats
> need to be improved in future if we want to get the original shadow
> stats.
>
> Reviewed-by: Andi Kleen <ak@...ux.intel.com>
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
> tools/perf/builtin-stat.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 44d1a5f..0b08665 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -1137,6 +1137,13 @@ static int parse_hybrid_type(const struct option *opt,
> return 0;
> }
>
> +static int add_default_hybrid_events(struct evlist *evlist)
> +{
> + struct parse_events_error err;
> +
> + return parse_events(evlist, "cycles,instructions,branches,branch-misses", &err);
> +}
> +
> static struct option stat_options[] = {
> OPT_BOOLEAN('T', "transaction", &transaction_run,
> "hardware transaction statistics"),
> @@ -1613,6 +1620,12 @@ static int add_default_attributes(void)
> { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },
>
> };
> + struct perf_event_attr default_sw_attrs[] = {
> + { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
> + { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES },
> + { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
> + { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
> +};
>
> /*
> * Detailed stats (-d), covering the L1 and last level data caches:
> @@ -1849,6 +1862,15 @@ static int add_default_attributes(void)
> }
>
> if (!evsel_list->core.nr_entries) {
> + perf_pmu__scan(NULL);
> + if (perf_pmu__hybrid_exist()) {
> + if (evlist__add_default_attrs(evsel_list,
> + default_sw_attrs) < 0) {
> + return -1;
> + }
> + return add_default_hybrid_events(evsel_list);
> + }
> +
> if (target__has_cpu(&target))
> default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
>
> --
> 2.7.4
>
--
- Arnaldo
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