[PATCH] perf stat: Fix L2 Topdown metrics disappear for raw events

[zhengjun.xing@linux.intel.com]

From: Zhengjun Xing <zhengjun.xing@linux.intel.com>

In perf/Documentation/perf-stat.txt, for "--td-level" the default "0" means
the max level that the current hardware support. So we need initialize the
stat_config.topdown_level to TOPDOWN_MAX_LEVEL when “--td-level=0” or no
“--td-level” option. Otherwise, for the hardware with a max level is 2, the
2nd level metrics disappear for raw events in this case. The issue cannot
be observed for the perf stat default or "--topdown" options. This commit
fixes the raw events issue and removes the duplicated code for the perf
stat default.

Before:

 # ./perf stat -e "cpu-clock,context-switches,cpu-migrations,page-faults,instructions,cycles,ref-cycles,branches,branch-misses,{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}" sleep 1

 Performance counter stats for 'sleep 1':

              1.03 msec cpu-clock                        #    0.001 CPUs utilized
                 1      context-switches                 #  966.216 /sec
                 0      cpu-migrations                   #    0.000 /sec
                60      page-faults                      #   57.973 K/sec
         1,132,112      instructions                     #    1.41  insn per cycle
           803,872      cycles                           #    0.777 GHz
         1,909,120      ref-cycles                       #    1.845 G/sec
           236,634      branches                         #  228.640 M/sec
             6,367      branch-misses                    #    2.69% of all branches
         4,823,232      slots                            #    4.660 G/sec
         1,210,536      topdown-retiring                 #     25.1% Retiring
           699,841      topdown-bad-spec                 #     14.5% Bad Speculation
         1,777,975      topdown-fe-bound                 #     36.9% Frontend Bound
         1,134,878      topdown-be-bound                 #     23.5% Backend Bound
           189,146      topdown-heavy-ops                #  182.756 M/sec
           662,012      topdown-br-mispredict            #  639.647 M/sec
         1,097,048      topdown-fetch-lat                #    1.060 G/sec
           416,121      topdown-mem-bound                #  402.063 M/sec

       1.002423690 seconds time elapsed

       0.002494000 seconds user
       0.000000000 seconds sys

After:

 # ./perf stat -e "cpu-clock,context-switches,cpu-migrations,page-faults,instructions,cycles,ref-cycles,branches,branch-misses,{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}" sleep 1

 Performance counter stats for 'sleep 1':

              1.13 msec cpu-clock                        #    0.001 CPUs utilized
                 1      context-switches                 #  882.128 /sec
                 0      cpu-migrations                   #    0.000 /sec
                61      page-faults                      #   53.810 K/sec
         1,137,612      instructions                     #    1.29  insn per cycle
           881,477      cycles                           #    0.778 GHz
         2,093,496      ref-cycles                       #    1.847 G/sec
           236,356      branches                         #  208.496 M/sec
             7,090      branch-misses                    #    3.00% of all branches
         5,288,862      slots                            #    4.665 G/sec
         1,223,697      topdown-retiring                 #     23.1% Retiring
           767,403      topdown-bad-spec                 #     14.5% Bad Speculation
         2,053,322      topdown-fe-bound                 #     38.8% Frontend Bound
         1,244,438      topdown-be-bound                 #     23.5% Backend Bound
           186,665      topdown-heavy-ops                #      3.5% Heavy Operations       #     19.6% Light Operations
           725,922      topdown-br-mispredict            #     13.7% Branch Mispredict      #      0.8% Machine Clears
         1,327,400      topdown-fetch-lat                #     25.1% Fetch Latency          #     13.7% Fetch Bandwidth
           497,775      topdown-mem-bound                #      9.4% Memory Bound           #     14.1% Core Bound

       1.002701530 seconds time elapsed

       0.002744000 seconds user
       0.000000000 seconds sys

Fixes: 63e39aa6ae10 ("perf stat: Support L2 Topdown events")
Signed-off-by: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
---
 tools/perf/builtin-stat.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index ded90d851f75..4664d21d076f 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1911,6 +1911,9 @@ static int add_default_attributes(void)
 		free(str);
 	}
 
+	if (!stat_config.topdown_level)
+		stat_config.topdown_level = TOPDOWN_MAX_LEVEL;
+
 	if (!evsel_list->core.nr_entries) {
 		if (target__has_cpu(&target))
 			default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
@@ -1927,8 +1930,6 @@ static int add_default_attributes(void)
 		}
 		if (evlist__add_default_attrs(evsel_list, default_attrs1) < 0)
 			return -1;
-
-		stat_config.topdown_level = TOPDOWN_MAX_LEVEL;
 		/* Platform specific attrs */
 		if (evlist__add_default_attrs(evsel_list, default_null_attrs) < 0)
 			return -1;
-- 
2.25.1