[PATCH v5 14/26] perf stat: Add default hybrid events

From: Jin Yao <yao.jin@linux.intel.com>
To: acme@kernel.org, jolsa@kernel.org, peterz@infradead.org,
	mingo@redhat.com, alexander.shishkin@linux.intel.com
Cc: Linux-kernel@vger.kernel.org, ak@linux.intel.com,
	kan.liang@intel.com, yao.jin@intel.com,
	Jin Yao <yao.jin@linux.intel.com>
Subject: [PATCH v5 14/26] perf stat: Add default hybrid events
Date: Fri, 23 Apr 2021 13:35:29 +0800	[thread overview]
Message-ID: <20210423053541.12521-15-yao.jin@linux.intel.com> (raw)
In-Reply-To: <20210423053541.12521-1-yao.jin@linux.intel.com>

Previously if '-e' is not specified in perf stat, some software events
and hardware events are added to evlist by default.

Before:

  # perf stat -a -- sleep 1

   Performance counter stats for 'system wide':

           24,044.40 msec cpu-clock                 #   23.946 CPUs utilized
                  99      context-switches          #    4.117 /sec
                  24      cpu-migrations            #    0.998 /sec
                   3      page-faults               #    0.125 /sec
           7,000,244      cycles                    #    0.000 GHz
           2,955,024      instructions              #    0.42  insn per cycle
             608,941      branches                  #   25.326 K/sec
              31,991      branch-misses             #    5.25% of all branches

         1.004106859 seconds time elapsed

Among the events, cycles, instructions, branches and branch-misses
are hardware events.

One hybrid platform, two hardware events are created for one
hardware event.

cpu_core/cycles/,
cpu_atom/cycles/,
cpu_core/instructions/,
cpu_atom/instructions/,
cpu_core/branches/,
cpu_atom/branches/,
cpu_core/branch-misses/,
cpu_atom/branch-misses/

These events would be added to evlist on hybrid platform.

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:

  # perf stat -a -- sleep 1

   Performance counter stats for 'system wide':

           24,043.99 msec cpu-clock                 #   23.991 CPUs utilized
                 139      context-switches          #    5.781 /sec
                  25      cpu-migrations            #    1.040 /sec
                   6      page-faults               #    0.250 /sec
          10,381,751      cpu_core/cycles/          #  431.782 K/sec
           1,264,216      cpu_atom/cycles/          #   52.579 K/sec
           3,406,958      cpu_core/instructions/    #  141.697 K/sec
             414,588      cpu_atom/instructions/    #   17.243 K/sec
             705,149      cpu_core/branches/        #   29.327 K/sec
              82,358      cpu_atom/branches/        #    3.425 K/sec
              40,821      cpu_core/branch-misses/   #    1.698 K/sec
               9,086      cpu_atom/branch-misses/   #  377.891 /sec

         1.002228863 seconds time elapsed

We can see two events are created for one hardware event.

One TODO 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.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
v5:
 - Do the same way like when topdown calls parse events for checking
   result and displayt the error.

v4:
 - No change.

 tools/perf/builtin-stat.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 1255af4751c2..3ab4069ff8f0 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1626,6 +1626,12 @@ static int add_default_attributes(void)
   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS	},
   { .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		},
 };
 
 /*
@@ -1863,6 +1869,28 @@ static int add_default_attributes(void)
 	}
 
 	if (!evsel_list->core.nr_entries) {
+		if (perf_pmu__has_hybrid()) {
+			const char *hybrid_str = "cycles,instructions,branches,branch-misses";
+
+			if (target__has_cpu(&target))
+				default_sw_attrs[0].config = PERF_COUNT_SW_CPU_CLOCK;
+
+			if (evlist__add_default_attrs(evsel_list,
+						      default_sw_attrs) < 0) {
+				return -1;
+			}
+
+			err = parse_events(evsel_list, hybrid_str, &errinfo);
+			if (err) {
+				fprintf(stderr,
+					"Cannot set up hybrid events %s: %d\n",
+					hybrid_str, err);
+				parse_events_print_error(&errinfo, hybrid_str);
+				return -1;
+			}
+			return err;
+		}
+
 		if (target__has_cpu(&target))
 			default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
 
-- 
2.17.1

